【国际标准】BS 3643-2-1981 ISO 米制螺纹第二部分：规格与极限尺寸.pdf
[国际标准]BS3643-2-1981ISO米制螺纹第二部分：规格与极限尺寸标准
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[国际标准]BS3643-2-1981ISO米制螺纹第二部分：规格与极限尺寸标准,国际标准,BS3643,1981,ISO,米制,螺纹,第二,部分,规格,极限,尺寸,标准
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BRITISH STANDARDBS 3643-2:1981(Reprinted, incorporating Amendment No. 1)ISO metric screw threads Part 2: Specification for selected limits of sizeUDC 621.882.082.1:621.753.1/.2Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIBS 3643-2:1981This British Standard, having been prepared under the direction of the Mechanical Engineering Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 December 1981 BSI 12-1998First published June 1965First revision December 1966Second revision December 1981ISBN 0 580 12412 6Cooperating organizationsThe Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consist of representatives from the following:The Organization marked with an asterisk in the above list, together with the following, were directly represented on this Technical Committee entrusted with the presentation of this British Standard:Associated Offices Technical CommitteeDepartment of Trade (Marine Division)Association of Consulting EngineersDepartment of TransportAssociation of Hydraulic EquipmentElectricity supply Industry in England andManufacturersWalesAssociation of Mining Electrical andEngineering Equipment Users AssociationMechanical EngineersFederation of Manufacturers of ConstructionBritish Compressed Air SocietyEquipment and CranesBritish Electrical and Allied ManufacturersHealth and Safety ExecutiveAssociation (BEAMA)*Institution of Gas EngineersBritish Gas CorporationInstitution of Plant EngineersBritish Gear Manufacturer AssociationInstitution of Production EngineersBritish Internal Combustion EngineLloyds Register of ShippingManufacturers Association*London Transport ExecutiveBritish Pump Manufacturers AssociationMachine Tool Industry Research AssociationBritish Steel corporationMinistry of Defence*British Steel IndustryNational Coal Board*British Valve Manufactures Association Ltd.Oil Companies Materials AssociationCbmpeProcess Plant AssociationChartered Institution of Building Services Railway Industry Association of Great Britain*Crown Agents for Oversea Governments and Society of Motor Manufacturers and Traders AdministrationsLimitedDepartment of the Environment (PSA)Telecommunication Engineering andDepartment of Industry (National Engineering Manufacturing Association (TEMA)*Laboratory)Agricultural Engineers AssociationGauge and Tool Makers AssociationBicycle Association of Great BritainScrew Thread Tool Manufacturers AssociationBritish Industrial Fasteners FederationSociety of British Aerospace CompaniesBritish Railways BoardLimitedBusiness Equipment Trade AssociationIndividual manufacturerFasteners and Turned Parts InstituteAmendments issued since publicationAmd. NoDate of issueComments5094June 1986Indicated by a sideline in the marginLicensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-1998iContentsPageCooperating organizationsInside front coverForewordii1Scope12References13Designation1Appendix A Additional tolerance classes for aerospace use38Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement2Table 2 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement for aerospace use39Publications referred toInside back coverLicensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981ii BSI 12-1998ForewordThis British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee. It supersedes BS 3643-2:1966 and BS 3643-3:1967, which are therefore withdrawn.BS 3643-1 contains details of the basic thread profile, general plan of standard diameter/pitch combinations, basic thread dimensions, tolerance principles and basic data from the latest ISO metric screw thread standards.The previous edition of BS 3643-2 specified the limits and tolerances for coarse pitch series threads in the range 1 mm to 68 mm diameter. The previous edition of BS 3643-3 specified the limits and tolerances for fine (constant) pitch threads in the range 1 mm to 300 mm diameter.In both Parts 2 and 3, three classes of fit were given, “close”, “medium” and “free”, the respective nut/bolt tolerance classes being 5H/4h, 6H/6g and 7H/8g. The same tolerance classes have been used as the basis for this standard but in addition the tolerance class 4H is specified for pitches up to and including 0.45 mm to align with Part 1. The selection of nut/bolt tolerance classes rests with the designer, based on the information given in Part 1.This edition of Part 2 combines the information previously given in both Parts 2 and 3, and is set out in a single table so as to present designers and users with the limits and tolerances for ISO metric threads in the most convenient form.For further detailed information see BS 3643-1.Pending the publication of a British Standard on coated threads, which will be based on ISO/DIS 4042, BS 3382 should be consulted for guidance.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 40, an inside back cover and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199811 ScopeThis Part of this British Standard specifies the fundamental deviations, tolerances and limits of size for the tolerance classes 4H, 5H, 6H and 7H for internal threads (nuts) and 4h, 6g and 8g for external threads (bolts) where appropriate for:coarse pitch series within the range 1 mm to 68 mm diameter;fine pitch series within the range 1 mm to 33 mm diameter;constant pitch series within the range 8 mm to 300 mm diameter.For certain diameter/pitch combinations tolerance class 4H for internal threads and tolerance classes 6h and 4g for external threads have been included in appendix A primarily for aerospace use.NOTEAttention is drawn to the fact that, with the different screw thread forms available, there is the possibility of mismatch. It is the responsibility of the designer of the end product to ensure that this possibility is reduced to a minimum. For further information see PD 6494.2 ReferencesThe titles of the standards publications referred to in this standard are listed on the inside back cover.3 DesignationThe complete designation for a screw thread shall comprise a designation for the thread system and a designation for the thread tolerance class (see 4.3 and 6.4 of BS 3643-1:1981).Examples:Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:19812 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementNOTEFor the minor diameter of external threads this table specifies the minimum dimensions only. The maximum dimensions have not been specified based on the requirement of 6.10 of BS 3643-1:1981 that these dimensions are controlled by the GO gauge.All dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine constant Tolerance classFund dev.Major diameterPitch diameterMinor diameterTolerance classFund dev.Major diameterPitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.10.24h6g00.0171.0000.9830.0360.0560.9640.9270.8700.8530.0300.0480.8400.8050.7170.6824H01.0000.910 0.0400.8700.821 0.0380.7830.254h6g00.0181.0000.9820.0420.0670.9580.9150.8380.8200.0340.0530.8040.7670.6490.6134H5H001.0001.0000.8830.8940.0450.0560.8380.8380.7740.7850.0450.0560.7290.7291.10.24h6g00.0171.1001.0830.0360.0561.0641.0270.9700.9530.0300.0480.9400.9050.8170.7824H01.1001.010 0.0400.9700.921 0.0380.8830.254h6g00.0181.1001.0820.0420.0671.0581.0150.9380.9200.0340.0530.9040.8670.7500.7134H5H001.1001.1000.9830.9940.0450.0560.9380.9380.8740.8850.0450.0560.8290.8291.20.24h6g00.0171.2001.1830.0360.0561.1641.1271.0701.0530.0300.0481.0401.0050.9170.8824H01.2001.110 0.0401.0701.021 0.0380.9830.254h6g00.0181.2001.1820.0420.0671.1581.1151.0381.0200.0340.0531.0040.9670.8500.8134H5H001.2001.2001.0831.0940.0450.0561.0381.0380.9740.9850.0450.0560.9290.9291.40.24h6g00.0171.4001.3830.0360.0561.3641.3271.2701.2530.0300.0481.2401.2051.1171.0824H01.4001.310 0.0401.2701.221 0.0381.1830.34h6g00.0181.4001.3820.0480.0751.3521.3071.2051.1870.0360.0561.1691.1310.9840.9464H5H6H0001.4001.4001.4001.2531.2651.2800.0480.0600.0751.2051.2051.2051.1281.1421.1600.0530.0670.0851.0751.0751.0751.60.24h6g00.0171.6001.5830.0360.0561.5641.5271.4701.4530.0320.0501.4381.4031.3151.2804H01.6001.512 0.0421.4701.421 0.0381.3830.354h6g00.0191.6001.5810.0530.0851.5471.4961.3731.3540.0400.0631.3331.2911.1171.0754H5H6H0001.6001.6001.6001.4261.4401.4580.0530.0670.0851.3731.3731.3731.2841.3011.3210.0630.0800.1001.2211.2211.221Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-19983Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine constant Tolerance classFund dev.Major diameterPitch diameterMinor diameterTolerance classFund dev.Major diameterPitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.1.80.24h6g00.0171.8001.7830.0360.0561.7641.7271.6701.6530.0320.0501.6381.6031.5151.4804H01.8001.712 0.0421.6701.621 0.0381.5830.354h6g00.0191.8001.7810.0530.0851.7471.6961.5731.5540.0400.0631.5331.4911.3171.2754H5H6H0001.8001.8001.8001.6261.6401.6580.0530.0670.0851.5731.5731.5731.4841.5011.5210.0630.0800.1001.4211.4211.42120.254h6g00.0182.0001.9820.0420.0671.9581.9151.8381.8200.0360.0561.8021.7641.6481.6104H5H002.0002.0001.8861.8980.0480.0601.8381.8381.7741.7850.0450.0561.7291.7290.44h6g00.0192.0001.9810.0600.0951.9401.8861.7401.7210.0420.0671.6981.6541.4521.4084H5H6H0002.0002.0002.0001.7961.8111.8300.0560.0710.0901.7401.7401.7401.6381.6571.6790.0710.0900.1121.5671.5671.5672.20.254h6g00.0182.2002.1820.0420.0672.1582.1152.0382.0200.0360.0562.0021.9641.8481.8104H5H002.2002.2002.0862.0980.0480.0602.0382.0381.9741.9850.0450.0561.9291.9290.454h6g00.0202.2002.1800.0630.1002.1372.0801.9081.8880.0450.0711.8631.8171.5851.5394H5H6H0002.2002.2002.2001.9681.9832.0030.0600.0750.0951.9081.9081.9081.7931.8131.8380.0800.1000.1251.7131.7131.7132.50.354h6g00.0192.5002.4810.0530.0852.4472.3962.2732.2540.0400.0632.2332.1912.0171.9754H5H6H0002.5002.5002.5002.3262.3402.3580.0530.0670.0852.2732.2732.2732.1842.2012.2210.0630.0800.1002.1212.1212.1210.454h6g00.0202.5002.4800.0630.1002.4372.3802.2082.1880.0450.0712.1632.1171.8851.8394H5H6H0002.5002.5002.5002.2682.2832.3030.0600.0750.0952.2082.2082.2082.0932.1132.1380.0800.1000.1252.0132.0132.01330.354h6g00.0193.0002.9810.0530.0852.9472.8962.7732.7540.0420.0672.7312.6872.5152.4714H5H6H0003.0003.0003.0002.8292.8442.8630.0560.0710.0902.7732.7732.7732.6842.7012.7210.0630.0800.1002.6212.6212.6210.54h6g00.0203.0002.9800.0670.1062.9332.8742.6752.6550.0480.0752.6272.5802.3192.2725H6H7H0003.0003.0003.0002.7552.7752.8000.0800.1000.1252.6752.6752.6752.5712.5992.6390.1120.1400.1802.4592.4592.459Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:19814 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine constant Tolerance classFund dev.Major diameterPitch diameterMinor diameterTolerance classFund dev.Major diameterPitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.3.50.354h6g00.0193.5003.4810.0530.0853.4473.3963.2733.2540.0420.0673.2313.1873.0152.9714H5H6H0003.5003.5003.5003.3293.3443.3630.0560.0710.0903.2733.2733.2733.1843.2013.2210.0630.0800.1003.1213.1213.1210.64h6g00.0213.5003.4790.0800.1253.4203.3543.1103.0890.0530.0853.0573.0042.6882.6355H6H7H0003.5003.5003.5003.2003.2223.2500.0900.1120.1403.1103.1103.1102.9753.0103.0500.1250.1600.2002.8502.8502.85040.54h6g00.0204.0003.9800.0670.1063.9333.8743.6753.6550.0480.0753.6273.5803.3193.2725H6H7H0004.0004.0004.0003.7553.7753.8000.0800.1000.1253.6753.6753.6753.5713.5993.6390.1120.1400.1803.4593.4593.4590.74h6g00.0224.0003.9780.0900.1403.9103.8383.5453.5230.0560.0903.4893.4333.0583.0025H6H7H0004.0004.0004.0003.6403.6633.6950.0950.1180.1503.5453.5453.5453.3823.4223.4660.1400.1800.2243.2423.2423.2424.50.54h6g00.0204.5004.4800.0670.1064.4334.3744.1754.1550.0480.0754.1274.0803.8193.7725H6H7H0004.5004.5004.5004.2554.2754.3000.0800.1000.1254.1754.1754.1754.0714.0994.1390.1120.1400.1803.9593.9593.9590.754h6g00.0224.5004.4780.0900.1404.4104.3384.0133.9910.0560.0903.9573.9013.4953.4395H6H7H0004.5004.5004.5004.1084.1314.1630.0950.1180.1504.0134.0134.0133.8383.8783.9240.1500.1900.2363.6883.6883.68850.54h6g00.0205.0004.9800.0670.1064.9334.8744.6754.6550.0480.0754.6274.5804.3194.2725H6H7H0005.0005.0005.0004.7554.7754.8000.0800.1000.1254.6754.6754.6754.5714.5994.6390.1120.1400.1804.4594.4594.4590.84h6g00.0245.0004.9760.0950.1504.9054.8264.4804.4560.0600.0954.4204.3613.9273.8685H6H7H0005.0005.0005.0004.5804.6054.6400.1000.1250.1604.4804.4804.4804.2944.3344.3840.1600.2000.2504.1344.1344.1345.50.54h6g00.0205.5005.4800.0670.1065.4335.3745.1755.1550.0480.0755.1275.0804.8194.7725H6H7H0005.5005.5005.5005.2555.2755.3000.0800.1000.1255.1755.1755.1755.0715.0995.1390.1120.1400.1804.9594.9594.959Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-19985Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine constant Tolerance classFund dev.Major diameterPitch diameterMinor diameterTolerance classFund dev.Major diameterPitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.60.754h6g00.0226.0005.9780.0900.1405.9105.8385.5135.4910.0630.1005.4505.3914.9884.9295H6H7H0006.0006.0006.0005.6195.6455.6830.1060.1320.1705.5135.5135.5135.3385.3785.4240.1500.1900.2365.1885.1885.18814h6g8g00.0260.0266.0005.9745.9740.1120.1800.2805.8885.7945.6945.3505.3245.3240.0710.1120.1805.2795.2125.1444.6634.5974.5285H6H7H0006.0006.0006.0005.4685.5005.5400.1180.1500.1905.3505.3505.3505.1075.1535.2170.1900.2360.3004.9174.9174.91770.754h6g00.0227.0006.9780.0900.1406.9106.8386.5136.4910.0630.1006.4506.3915.9885.9295H6H7H0007.0007.0007.0006.6196.6456.6830.1060.1320.1706.5136.5136.5136.3386.3786.4240.1500.1900.2366.1886.1886.18814h6g8g00.0260.0267.0006.9746.9740.1120.1800.2806.8886.7946.6946.3506.3246.3240.0710.1120.1806.2796.2126.1445.6635.5965.5285H6H7H0007.0007.0007.0006.4686.5006.5400.1180.1500.1906.3506.3506.3506.1076.1536.2170.1900.2360.3005.9175.9175.91780.754h6g00.0228.0007.9780.0900.1407.9107.8387.5137.4910.0630.1007.4507.3916.9886.9295H6H7H0008.0008.0008.0007.6197.6457.6830.1060.1320.1707.5137.5137.5137.3387.3787.4240.1500.1900.2367.1887.1887.18814h6g8g00.0260.0268.0007.9747.9740.1120.1800.2807.8887.7947.6947.3507.3247.3240.0710.1120.1807.2797.2127.1446.6636.5966.5285H6H7H0008.0008.0008.0007.4687.5007.5400.1180.1500.1907.3507.3507.3507.1077.1537.2170.1900.2360.3006.9176.9176.9171.254h6g8g00.0280.0288.0007.9727.9720.1320.2120.3357.8687.7607.6377.1887.1607.1600.0750.1180.1907.1137.0426.9706.3436.2726.2005H6H7H0008.0008.0008.0007.3137.3487.3880.1250.1600.2007.1887.1887.1886.8596.9126.9820.2120.2650.3356.6476.6476.64790.754h6g00.0229.0008.9780.0900.1408.9108.8388.5138.4910.0630.1008.4508.3917.9887.9295H6H7H0009.0009.0009.0008.6198.6458.6830.1060.1320.1708.5138.5138.5138.3388.3788.4240.1500.1900.2368.1888.1888.18814h6g8g00.0260.0269.0008.9748.9740.1120.1800.2808.8888.7948.6948.3508.3248.3240.0710.1120.1808.2798.2128.1447.6637.5967.5285H6H7H0009.0009.0009.0008.4688.5008.5400.1180.1500.1908.3508.3508.3508.1078.1538.2170.1900.2360.3007.9177.9177.9171.254h6g8g00.0280.0289.0008.9728.9720.1320.2120.3358.8688.7608.6378.1888.1608.1600.0750.1180.1908.1138.0427.9707.3437.2727.2005H6H7H0009.0009.0009.0008.3138.3488.3880.1250.1600.2008.1888.1888.1887.8597.9127.9820.2120.2650.3357.6477.6477.647Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:19816 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine constant Tolerance classFund dev.Major diameterPitch diameterMinor diameterTolerance classFund dev.Major diameterPitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.100.754h6g00.02210.0009.9780.0900.1409.9109.8389.5139.4910.0630.1009.4509.3918.9888.9295H6H7H00010.00010.00010.0009.6199.6459.6830.1060.1320.1709.5139.5139.5139.3389.3789.4240.1500.1900.2369.1889.1889.18814h6g8g00.0260.02610.0009.9749.9740.1120.1800.2809.8889.7949.6949.3509.3249.3240.0710.1120.1809.2799.2129.1448.6638.5968.5285H6H7H00010.00010.00010.0009.4689.5009.5400.1180.1500.1909.3509.3509.3509.1079.1539.2170.1900.2360.3008.9178.9178.9171.254h6g8g00.0280.02810.0009.9729.9720.1320.2120.3359.8689.7609.6379.1889.1609.1600.0750.1180.1909.1139.0428.9708.3438.2728.2005H6H7H00010.00010.00010.0009.3139.3489.3880.1250.1600.2009.1889.1889.1888.8598.9128.9820.2120.2650.3358.6478.6478.6471.54h6g8g00.0320.03210.0009.9689.9680.1500.2360.3759.8509.7329.5939.0268.9948.9940.0850.1320.2128.9418.8628.7828.0187.9387.8585H6H7H00010.00010.00010.0009.1669.2069.2500.1400.1800.2249.0269.0269.0268.6128.6768.7510.2360.3000.3758.3768.3768.376110.754h6g00.02211.00010.9780.0900.14010.91010.83810.51310.4910.0630.10010.45010.3919.9889.9295H6H7H00011.00011.00011.00010.61910.64510.6830.1060.1320.17010.51310.51310.51310.33810.37810.4240.1500.1900.23610.18810.18810.18814h6g8g00.0260.02611.00010.97410.9740.1120.1800.28010.88810.79410.69410.35010.32410.3240.0710.1120.18010.27910.21210.1449.6639.5969.5285H6H7H00011.00011.00011.00010.46810.50010.5400.1180.1500.19010.35010.35010.35010.10710.15310.2170.1900.2360.3009.9179.9179.9171.54h6g8g00.0320.03211.00010.96810.9680.1500.2360.37510.85010.73210.59310.0269.9949.9940.0850.1320.2129.9419.8629.7829.0188.9388.8585H6H7H00011.00011.00011.00010.16610.20610.2500.1400.1800.22410.02610.02610.0269.6129.6769.7510.2360.3000.3759.3769.3769.3761214h6g8g00.0260.02612.00011.97411.9740.1120.1800.28011.88811.79411.69411.35011.32411.3240.0750.1180.19011.27511.20611.13410.65910.59010.5185H6H7H00012.00012.00012.00011.47511.51011.5500.1250.1600.20011.35011.35011.35011.10711.15311.2170.1900.2360.30010.91710.91710.9171.254h6g8g00.0280.02812.00011.97211.9720.1320.2120.33511.86811.76011.63711.18811.16011.1600.0850.1320.21211.10311.02810.94810.33310.25710.1775H6H7H00012.00012.00012.00011.32811.36811.4120.1400.1800.22411.18811.18811.18810.85910.91210.9820.2120.2650.33510.64710.64710.6471.54h6g8g00.0320.03212.00011.96811.9680.1500.2360.37511.85011.73211.59311.02610.99410.9940.0900.1400.22410.93610.85410.77010.0129.9309.8465H6H7H00012.00012.00012.00011.17611.21611.2620.1500.1900.23611.02611.02611.02610.61210.67610.7510.2360.3000.37510.37610.37610.3761.754h6g8g00.0340.03412.00011.96611.9660.1700.2650.42511.83011.70111.54110.86310.82910.8290.0950.1500.23610.768 10.67910.5939.6929.6029.5165H6H7H00012.00012.00012.00011.02311.06311.1130.1600.2000.25010.86310.86310.86310.37110.44110.5310.2650.3350.42510.10610.10610.106Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-19987Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine constant Tolerance classFund dev.Major diameterPitch diameterMinor diameterTolerance classFund dev.Major diameterPitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.1414h6g8g00.0260.02614.00013.97413.9740.1120.1800.28013.88813.79413.69413.35013.32413.3240.0750.1180.19013.27513.20613.13412.65912.59012.5185H6H7H00014.00014.00014.00013.47513.51013.5500.1250.1600.20013.35013.35013.35013.10713.15313.2170.1900.2360.30012.91712.91712.9171.254h6g8g00.0280.02814.00013.97213.9720.1320.2120.33513.86813.76013.63713.18813.16013.1600.0850.1320.21213.10313.02812.94812.33312.25712.1775H6H7H00014.00014.00014.00013.32813.36813.4120.1400.1800.22413.18813.18813.18812.85912.91212.9820.2120.2650.33512.64712.64712.6471.54h6g8g00.0320.03214.00013.96813.9680.1500.2360.37513.85013.73213.59313.02612.99412.9940.0900.1400.22412.93612.85412.77012.01211.93011.8465H6H7H00014.00014.00014.00013.17613.21613.2620.1500.1900.23613.02613.02613.02612.61212.67612.7510.2360.3000.37512.37612.37612.37624h6g8g00.0380.03814.00013.96213.9620.1800.2800.45013.82013.68213.51212.70112.66312.6630.1000.1600.25012.60112.50312.41311.36911.27111.1815H6H7H00014.00014.00014.00012.87112.91312.9660.1700.2120.26512.70112.70112.70112.13512.21012.3100.3000.3750.47511.83511.83511.8351514h6g8g00.0260.02615.00014.97414.9740.1120.1800.28014.88814.79414.69414.35014.32414.3240.0750.1180.19014.27514.20614.13413.65913.59013.5185H6H7H00015.00015.00015.00014.47514.51014.5500.1250.1600.20014.35014.35014.35014.10714.15314.2170.1900.2360.30013.91713.91713.9171.54h6g8g00.0320.03215.00014.96814.9680.1500.2360.37514.85014.73214.59314.02613.99413.9940.0900.1400.22413.93613.85413.77013.01212.93012.8465H6H7H00015.00015.00015.00014.17614.21614.2620.1500.1900.23614.02614.02614.02613.61213.67613.7510.2360.3000.37513.37613.37613.3761614h6g8g00.0260.02616.00015.97415.9740.1120.1800.28015.88815.79415.69415.35015.32415.3240.0750.1180.19015.27515.20615.13414.65914.59014.5185H6H7H00016.00016.00016.00015.47515.51015.5500.1250.1600.20015.35015.35015.35015.10715.15315.2170.1900.2360.30014.91714.91714.9171.54h6g8g00.0320.03216.00015.96815.9680.1500.2360.37515.85015.73215.59315.02614.99414.9940.0900.1400.22414.93614.85414.77014.01213.93013.8465H6H7H00016.00016.00016.00015.17615.21615.2620.1500.1900.23615.02615.02615.02614.61214.67614.7510.2360.3000.37514.37614.37614.37624h6g8g00.0380.03816.00015.96215.9620.1800.2800.45015.82015.68215.51214.70114.66314.6630.1000.1600.25014.60114.50314.41313.36913.27113.1815H6H7H00016.00016.00016.00014.87114.91314.9660.1700.2120.26514.70114.70114.70114.13514.21014.3100.3000.3750.47513.83513.83513.8351714h6g8g00.0260.02617.00016.97416.9740.1120.1800.28016.88816.79416.69416.35016.32416.3240.0750.1180.19016.27516.20616.13415.65915.59015.5185H6H7H00017.00017.00017.00016.47516.51016.5500.1250.1600.20016.35016.35016.35016.10716.15316.2170.1900.2360.30015.91715.91715.9171.54h6g8g00.0320.03217.00016.96816.9680.1500.2360.37516.85016.73216.59316.02615.99415.9940.0900.1400.22415.93615.85415.77015.01214.93014.8465H6H7H00017.00017.00017.00016.17616.21616.2620.1500.1900.23616.02616.02616.02615.61215.67615.7510.2360.3000.37515.37615.37615.376Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:19818 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine constant Tolerance classFund dev.Major diameterPitch diameterMinor diameterTolerance classFund dev.Major diameterPitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.1814h6g8g00.0260.02618.00017.97417.9740.1120.1800.28017.88817.79417.69417.35017.32417.3240.0750.1180.19017.27517.20617.13416.65916.59016.5185H6H7H00018.00018.00018.00017.47517.51017.5500.1250.1600.20017.35017.35017.35017.10717.15317.2170.1900.2360.30016.91716.91716.9171.54h6g8g00.0320.03218.00017.96817.9680.1500.2360.37517.85017.73217.59317.02616.99416.9940.0900.1400.22416.93616.85416.77016.01215.93015.8465H6H7H00018.00018.00018.00017.17617.21617.2620.1500.1900.23617.02617.02617.02616.61216.67616.7510.2360.3000.37516.37616.37616.37624h6g8g00.0380.03818.00017.96217.9620.1800.2800.45017.82017.68217.51216.70116.66316.6630.1000.1600.25016.60116.50316.41315.36915.27115.1815H6H7H00018.00018.00018.00016.87116.91316.9660.1700.2120.26516.70116.70116.70116.13516.21016.3100.3000.3750.47515.83515.83515.8352.54h6g8g00.0420.04218.00017.95817.9580.2120.3350.53017.78817.62317.42816.37616.33416.3340.1060.1700.26516.27016.16416.06914.73014.62414.5295H6H7H00018.00018.00018.00016.55616.60016.6560.1800.2240.28016.37616.37616.37615.64915.74415.8540.3550.4500.56015.29415.29415.2942014h6g8g00.0260.02620.00019.97419.9740.1120.1800.28019.88819.79419.69419.35019.32419.3240.0750.1180.19019.27519.20619.13418.65918.59018.5185H6H7H00020.00020.00020.00019.47519.51019.5500.1250.1600.20019.35019.35019.35019.10719.15319.2170.1900.2360.30018.91718.91718.9171.54h6g8g00.0320.03220.00019.96819.9680.1500.2360.37519.85019.73219.59319.02618.99418.9940.0900.1400.22418.93618.85418.77018.01217.93017.8465H6H7H00020.00020.00020.00019.17619.21619.2620.1500.1900.23619.02619.02619.02618.61218.67618.7510.2360.3000.37518.37618.37618.37624h6g8g00.0380.03820.00019.96219.9620.1800.2800.45019.82019.68219.51218.70118.66318.6630.1000.1600.25018.60118.50318.41317.36917.27117.1815H6H7H00020.00020.00020.00018.87118.91318.9660.1700.2120.26518.70118.70118.70118.13518.21018.3100.3000.3750.47517.83517.83517.8352.54h6g8g00.0420.04220.00019.95819.9580.2120.3350.53019.78819.62319.42818.37618.33418.3340.1060.1700.26518.27018.16418.06916.73016.62416.5295H6H7H00020.00020.00020.00018.55618.60018.6560.1800.2240.28018.37618.37618.37617.64917.74417.8540.3550.4500.56017.29417.29417.294Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-19989Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.2214h6g8g00.0260.02622.00021.97421.9740.1120.1800.28021.88821.79421.69421.35021.32421.3240.0750.1180.19021.27521.20621.13420.65920.59020.5185H6H7H00022.00022.00022.00021.47521.51021.5500.1250.1600.20021.35021.35021.35021.10721.15321.2170.1900.2360.30020.91720.91720.9171.54h6g8g00.0320.03222.00021.96821.9680.1500.2360.37521.85021.73221.59321.02620.99420.9940.0900.1400.22420.93620.85420.77020.01219.93019.8465H6H7H00022.00022.00022.00021.17621.21621.2620.1500.1900.23621.02621.02621.02620.61220.67620.7510.2360.3000.37520.37620.37620.37624h6g8g00.0380.03822.00021.96221.9620.1800.2800.45021.82021.68221.51220.70120.66320.6630.1000.1600.25020.60120.50320.41319.36919.27119.1815H6H7H00022.00022.00022.00020.87120.91320.9660.1700.2120.26520.70120.70120.70120.13520.21020.3100.3000.3750.47519.83519.83519.8352.54h6g8g00.0420.04222.00021.95821.9580.2120.3350.53021.78821.62321.42820.37620.33420.3340.1060.1700.26520.27020.16420.06918.73018.62418.5295H6H7H00022.00022.00022.00020.55620.60020.6560.1800.2240.28020.37620.37620.37619.64919.74419.8540.3350.4500.56019.29419.29419.2942414h6g8g00.0260.02624.00023.97423.9740.1120.1800.28023.88823.79423.69423.35023.32423.3240.0800.1250.20023.27023.19923.12422.65422.58322.5085H6H7H00024.00024.00024.00023.48223.52023.5620.1320.1700.21223.35023.35023.35023.10723.15323.2170.1900.2360.30022.91722.91722.9171.54h6g8g00.0320.03224.00023.96823.9680.1500.2360.37523.85023.73223.59323.02622.99422.9940.0950.1500.23622.93122.84422.75822.00721.92021.8345H6H7H00024.00024.00024.00023.18623.22623.2760.1600.2000.25023.02623.02623.02622.61222.67622.7510.2360.3000.37522.37622.37622.37624h6g8g00.0380.03824.00023.96223.9620.1800.2800.45023.82023.68223.51222.70122.66322.6630.1060.1700.26522.59522.49322.39821.36321.26121.1665H6H7H00024.00024.00024.00022.88122.92522.9810.1800.2240.28022.70122.70122.70122.13522.21022.3100.3000.3750.47521.83521.83521.83534h6g8g00.0480.04824.00023.95223.9520.2360.3750.60023.76423.57723.35222.05122.00322.0030.1250.2000.31521.92621.80321.68820.07819.95519.8405H6H7H00024.00024.00024.00022.26322.31622.3860.2120.2650.33522.05122.05122.05121.15221.25221.3820.4000.5000.63020.75220.75220.7522514h6g8g00.0260.02625.00024.97424.9740.1120.1800.28024.88824.79424.69424.35024.32424.3240.0800.1250.20024.27024.19924.12423.65423.58323.5085H6H7H00025.00025.00025.00024.48224.52024.5620.1320.1700.21224.35024.35024.35024.10724.15324.2170.1900.2360.30023.91723.91723.9171.54h6g8g00.0320.03225.00024.96824.9680.1500.2360.37524.85024.73224.59324.02623.99423.9940.0950.1500.23623.93123.84423.75823.00722.92022.8345H6H7H00025.00025.00025.00024.18624.22624.2760.1600.2000.25024.02624.02624.02623.61223.67623.7510.2360.3000.37523.37623.37623.37624h6g8g00.0380.03825.00024.96224.9620.1800.2800.45024.82024.68224.51223.70123.66323.6630.1060.1700.26523.59523.49323.39822.36322.26122.1665H6H7H00025.00025.00025.00023.88123.92523.9810.1800.2240.28023.70123.70123.70123.13523.21023.3100.3000.3750.47522.83522.83522.835Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198110 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.261.54h6g8g00.0320.03226.00025.96825.9680.1500.2360.37525.85025.73225.59325.02624.99424.9940.0950.1500.23624.93124.84424.75824.00723.92023.8345H6H7H00026.00026.00026.00025.18625.22625.2760.1600.2000.25025.02625.02625.02624.61224.67624.7510.2360.3000.37524.37624.37624.3762714h6g8g00.0260.02627.00026.97426.9740.1120.1800.28026.88826.79426.69426.35026.32426.3240.0800.1250.20026.27026.19926.12425.65425.58325.5085H6H7H00027.00027.00027.00026.48226.52026.5620.1320.1700.21226.35026.35026.35026.10726.15326.2170.1900.2360.30025.91725.91725.9171.54h6g8g00.0320.03227.00026.96826.9680.1500.2360.37526.85026.73226.59326.02625.99425.9940.0950.1500.23625.93125.84425.75825.00724.92024.8345H6H7H00027.00027.00027.00026.18626.22626.2760.1600.2000.25026.02626.02626.02625.61225.67622.7510.2360.3000.37525.37625.37625.37624h6g8g00.0380.03827.00026.96226.9620.1800.2800.45026.82026.68226.51225.70125.66325.6630.1060.1700.26525.59525.49325.39824.36324.26124.1665H6H7H00027.00027.00027.00025.88125.92525.9810.1800.2240.28025.70125.70125.70125.13525.21025.3100.3000.3750.47524.83524.83524.83534h6g8g00.0480.04827.00026.95226.9520.2360.3750.60026.76426.57726.35225.05125.00325.0030.1250.2000.31524.92624.80324.68823.07822.95522.8405H6H7H00027.00027.00027.00025.26325.31625.3860.2120.2650.33525.05125.05125.05124.15224.25224.3820.4000.5000.63023.75223.75223.7522814h6g8g00.0260.02628.00027.97427.9740.1120.1800.28027.88827.79427.69427.35027.32427.3240.0800.1250.20027.27027.19927.12426.65426.58326.5085H6H7H00028.00028.00028.00027.48227.52027.5620.1320.1700.21227.35027.35027.35027.10727.15327.2170.1900.2360.30026.91726.91726.9171.54h6g8g00.0320.03228.00027.96827.9680.1500.2360.37527.85027.73227.59327.02626.99426.9940.0950.1500.23626.93126.84426.75826.00725.92025.8345H6H7H00028.00028.00028.00027.18627.22627.2760.1600.2000.25027.02627.02627.02626.61226.67626.7510.2360.3000.37526.37626.37626.37624h6g8g00.0380.03828.00027.96227.9620.1800.2800.45027.82027.68227.51226.70126.66326.6630.1060.1700.26526.59526.49326.39025.36325.26125.1665H6H7H00028.00028.00028.00026.88126.92526.9810.1800.2240.28026.70126.70126.70126.13526.21026.3100.3000.3750.47525.83525.83525.835Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199811Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diameter max.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.3014h6g8g00.0260.02630.00029.97429.9740.1120.1800.28029.88829.79429.69429.35029.32429.3240.0800.1250.20029.27029.19929.12428.65428.58328.5085H6H7H00030.00030.00030.00029.48229.52029.5620.1320.1700.21229.35029.35029.35029.10729.15329.2170.1900.2360.30028.91728.91728.9171.54h6g8g00.0320.03230.00029.96829.9680.1500.2360.37529.85029.73229.59329.02628.99428.9940.0950.1500.23628.93128.84428.75828.00727.92027.8345H6H7H00030.00030.00030.00029.18629.22629.2760.1600.2000.25029.02629.02629.02628.61228.67628.7510.2360.3000.37528.37628.37628.37624h6g8g00.0380.03830.00029.96229.9620.1800.2800.45029.82029.68229.51228.70128.66328.6630.1060.1700.26528.59528.49328.39827.36327.26127.1665H6H7H00030.00030.00030.00028.88128.92528.9810.1800.2240.28028.70128.70128.70128.13528.21028.3100.3000.3750.47527.83527.83527.83534h6g8g00.0480.04830.00029.95229.9520.2360.3750.60029.76429.57729.35228.05128.00328.0030.1250.2000.31527.92627.80327.68826.07825.95525.8405H6H7H00030.00030.00030.00028.26328.31628.3860.2120.2650.33528.05128.05128.05127.15227.25227.3820.4000.5000.63026.75226.75226.7523.54h6g8g00.0530.05330.00029.94729.9470.2650.4250.67029.73529.52229.27727.72727.67427.6740.1320.2120.33527.59527.46227.33925.43825.30525.1825H6H7H00030.00030.00030.00027.95128.00728.0820.2240.2800.35527.72727.72727.72726.66126.77126.9210.4500.5600.71026.21126.21126.211321.54h6g8g00.0320.03232.00031.96831.9680.1500.2360.37531.85031.73231.59331.02630.99430.9940.0950.1500.23630.93130.84430.75830.00729.92029.8345H6H7H00032.00032.00032.00031.18631.22631.2760.1600.2000.25031.02631.02631.02630.61230.67630.7510.2360.3000.37530.37630.37630.37624h6g8g00.0380.03832.00031.96231.9620.1800.2800.45031.82031.68231.51230.70130.66330.6630.1060.1700.26530.59530.49330.39829.36329.26129.1665H6H7H00032.00032.00032.00030.88130.92530.9810.1800.2240.28030.70130.70130.70130.13530.21030.3100.3000.3750.47529.83529.83529.835331.54h6g8g00.0320.03233.00032.96832.9680.1500.2360.37532.85032.73232.59332.02631.99431.9940.0950.1500.23631.93131.84431.75831.00730.92030.8345H6H7H00033.00033.00033.00032.18632.22632.2760.1600.2000.25032.02632.02632.02631.61231.67631.7510.2360.3000.37531.37631.37631.37624h6g8g00.0380.03833.00032.96232.9620.1800.2800.45032.82032.68232.51231.70131.66331.6630.1060.1700.26531.59531.49331.39830.36330.26130.1665H6H7H00033.00033.00033.00031.88131.92531.9810.1800.2240.28031.70131.70131.70131.13531.21031.3100.3000.3750.47530.83530.83530.83534h6g8g00.0480.04833.00032.95232.9520.2360.3750.60032.76432.57732.35231.05131.00331.0030.1250.2000.31530.92630.80330.68829.07828.95528.8405H6H7H00033.00033.00033.00031.26331.31631.3860.2120.2650.33531.05131.05131.05131.15230.25230.3820.4000.5000.63029.75229.75229.7523.54h6g8g00.0530.05333.00032.94732.9470.2650.4250.67032.73532.52232.27730.72730.67430.6740.1320.2120.33530.59530.46230.33928.43828.30528.1825H6H7H00033.00033.00033.00030.95131.00731.0820.2240.2800.35530.72730.72730.72729.66129.77129.9210.4500.5600.71029.21129.21129.211Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198112 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diameter max.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.351.54h6g8g00.0320.03235.00034.96834.9680.1500.2360.37534.85034.73234.59334.02633.99433.9940.0950.1500.23633.93133.84433.75833.00732.92032.8345H6H7H00035.00035.00035.00034.18634.22634.2760.1600.2000.25034.02634.02634.02633.61233.67633.7510.2360.3000.37533.37633.37633.376361.54h6g8g00.0320.03236.00035.96835.9680.1500.2360.37535.85035.73235.59335.02634.99434.9940.0950.1500.23634.93134.84434.75834.00733.92033.8345H6H7H00036.00036.00036.00035.18635.22635.2760.1600.2000.25035.02635.02635.02634.61234.67634.7510.2360.3000.37534.37634.37634.37624h6g8g00.0380.03836.00035.96235.9620.1800.2800.45035.82035.68235.51234.70134.66334.6630.1060.1700.26534.59534.49334.39833.36333.26133.1665H6H7H00036.00036.00036.00034.88134.92534.9810.1800.2240.28034.70134.70134.70134.13534.21034.3100.3000.3750.47533.83533.83533.83534h6g8g00.0480.04836.00035.95235.9520.2360.3750.60035.76435.57735.35234.05134.00334.0030.1250.2000.31533.92633.80333.68832.07831.95531.8405H6H7H00036.00036.00036.00034.26334.31634.3860.2120.2650.33534.05134.05134.05133.15233.25233.3820.4000.5000.63032.75232.75232.75244h6g8g00.0600.06036.00035.94035.9400.3000.4750.75035.70035.46535.19033.40233.34233.3420.1400.2240.35533.26233.11832.98730.79830.65430.5235H6H7H00036.00036.00036.00033.63833.70233.7770.2360.3000.37533.40233.40233.40232.14532.27032.4200.4750.6000.75031.67031.67031.670381.54h6g8g00.0320.03238.00037.96837.9680.1500.2360.37637.85037.73237.59337.02636.99436.9940.0950.1500.23636.93136.84436.75836.00735.92035.8345H6H7H00038.00038.00038.00037.18637.22637.2760.1600.2000.25037.02637.02637.02633.61236.67636.7510.2360.3000.37536.37636.37636.376391.54h6g8g00.0320.03239.00038.96833.9680.1500.2630.37538.85038.73237.59338.02637.99437.9940.0950.1500.23637.93137.84437.75837.00736.92036.8345H6H7H00039.00039.00039.00038.18638.22638.2760.1600.2000.25038.02638.02638.02637.61237.67637.7510.2360.3000.37537.37637.37637.37624h6g8g00.0380.03839.00038.96238.9620.1800.2800.45038.82038.68238.51237.70137.66337.6630.1060.1700.26537.59537.49337.39836.36336.26136.1665H6H7H00039.00039.00039.00037.88137.92537.9810.1800.2240.28037.70137.70137.70137.13537.21037.3100.3000.3750.47536.83536.83536.83534h6g8g00.0480.04839.00038.95238.9520.2360.3750.60038.76438.57738.35237.05137.00337.0030.1250.2000.31536.92636.80336.68835.07834.95534.8405H6H7H00039.00039.00039.00037.26337.31637.3860.2120.2650.33537.05137.05137.05136.15236.25236.3820.4000.5000.63035.75235.75235.75244h6g8g00.0600.06039.00038.94038.9400.3000.4750.75038.70038.46538.19036.40236.34236.3420.1400.2240.35536.26236.11835.98733.79833.65433.5235H6H7H00039.00039.00039.00036.63836.70236.7770.2360.3000.37536.40236.40236.40235.14535.27035.4200.4750.6000.75034.67034.67034.670Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199813Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diameter max.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.401.54h6g8g00.0320.03240.00039.96839.9680.1500.2360.37539.85038.73239.59339.02638.99438.9940.0950.1500.23638.93138.84438.75838.00737.92037.8345H6H7H00040.00040.00040.00039.18639.22639.2760.1600.2000.25039.02639.02639.02638.61238.67638.7510.2360.3000.37538.37638.37638.37624h6g8g00.0380.03840.00039.96239.9620.1800.2800.45039.82039.68239.51238.70138.66338.6630.1060.1700.26538.59538.49338.39837.36337.26137.1665H6H7H00040.00040.00040.00038.88138.92538.9810.1800.2240.28038.70138.70138.70138.13538.21038.3100.3000.3750.47537.83537.83537.83534h6g8g00.0480.04840.00039.95239.9520.2360.3750.60039.76439.57739.35238.05138.00338.0030.1250.2000.31537.92637.80337.68836.07835.95535.8405H6H7H00040.00040.00040.00038.26338.31638.3860.2120.2650.33538.05138.05138.05137.15237.25237.3820.4000.5000.63036.75236.75236.752421.54h6g8g00.0320.03242.00041.96841.9680.1500.2360.37541.85041.73241.59341.02640.99440.9940.0950.1500.23640.93140.84440.75840.00739.92039.8345H6H7H00042.00042.00042.00041.18641.22641.2760.1600.2000.25041.02641.02641.02640.61240.67640.7510.2360.3000.37540.37640.37640.37624h6g8g00.0380.03842.00041.96241.9620.1800.2800.45041.82041.68241.51240.70140.66340.6630.1060.1700.26540.59540.49340.39839.36339.26139.1665H6H7H00042.00042.00042.00040.88140.92540.9810.1800.2240.28040.70140.70140.70140.13540.21040.3100.3000.3750.47539.83539.83539.83534h6g8g00.0480.04842.00041.95241.9520.2360.3750.60041.76441.57741.35240.05140.00340.0030.1250.2000.31539.92639.80339.68838.07837.95537.8405H6H7H00042.00042.00042.00040.26340.31640.3860.2120.2650.33540.05140.05140.05139.15239.25239.3820.4000.5000.63038.75238.75238.75244h6g8g00.0600.06042.00041.94041.9400.3000.4750.75041.70041.46541.19039.40239.34239.3420.1400.2240.35539.26239.11838.98736.79836.65436.5235H6H7H00042.00042.00042.00039.63839.70239.7770.2360.3000.37539.40239.40239.40238.14538.27038.4200.4750.6000.75037.67037.67037.6704.54h6g8g00.0630.06342.00041.93741.9370.3150.5000.80041.68541.43741.13739.07739.01439.0140.1500.2360.37538.92738.77838.63936.15536.00635.8675H6H7H00042.00042.00042.00039.32739.39239.4770.2500.3150.40039.07739.07739.07737.65937.79937.9790.5300.6700.85037.12937.12937.129Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198114 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.451.54h6g8g00.0320.03245.00044.96844.9680.1500.2360.37544.85044.73244.59344.02643.99443.9940.0950.1500.23643.93143.84443.75843.00742.92042.8345H6H7H00045.00045.00045.00044.18644.22644.2760.1600.2000.25044.02644.02644.02643.61243.67643.7510.2360.3000.37543.37643.37643.3762.04h6g8g00.0380.03845.00044.96244.9620.1800.2800.45044.82044.68244.51243.70143.66343.6630.1060.1700.26543.59543.49343.39842.36342.26142.1665H6H7H00045.00045.00045.00043.88143.92543.9810.1800.2240.28043.70143.70143.70143.13543.21043.3100.3000.3750.47542.83542.83542.8353.04h6g8g00.0480.04845.00044.95244.9520.2360.3750.60044.76444.57744.35243.05143.00343.0030.1250.2000.31542.92642.80342.68841.07840.95540.8405H6H7H00045.00045.00045.00043.26343.31643.3860.2120.2650.33543.05143.05143.05142.15242.25242.3820.4000.5000.63041.75241.75241.7524.04h6g8g00.0600.06045.00044.94044.9400.3000.4750.75044.70044.46544.19042.40242.34242.3420.1400.2240.35542.26242.11841.98739.79839.65439.5235H6H7H00045.00045.00045.00042.63842.70242.7770.2360.3000.37542.40242.40242.40241.14541.27041.4200.4750.6000.75040.67040.67040.6704.54h6g8g00.0630.06345.00044.93744.9370.3150.5000.80044.68544.43744.13742.07742.01442.0140.1500.2360.37541.92741.77841.63939.15539.00638.8675H6H7H00045.00045.00045.00042.32742.39242.4770.2500.3150.40042.07742.07742.07740.65940.79940.9790.5300.6700.85040.12940.12940.129481.54h6g8g00.0320.03248.00047.96847.9680.1500.2360.37547.85047.73247.59347.02646.99446.9940.1000.1600.25046.92646.83446.74446.00245.91045.8205H6H7H00048.00048.00048.00047.19647.23847.2910.1700.2120.26547.02647.02647.02646.61246.67646.7510.2360.3000.37546.37646.37646.3762.04h6g8g00.0380.03848.00047.96247.9620.1800.2800.45047.82047.68247.51246.70146.66346.6630.1120.1800.28046.58946.48346.38345.35745.25145.1515H6H7H00048.00048.00048.00046.89146.93747.0010.1900.2360.30046.70146.70146.70146.13546.21046.3100.3000.3750.47545.83545.83545.8353.04h6g8g00.0480.04848.00047.95247.9520.2360.3750.60047.76447.57747.35246.05146.00346.0030.1320.2120.33545.91945.79145.66844.07143.94343.8205H6H7H00048.00048.00048.00046.27546.33146.4060.2240.2800.35546.05146.05146.05145.15245.25245.3820.4000.5000.63044.75244.75244.7524.04h6g8g00.0600.06048.00047.94047.9400.3000.4750.75047.70047.46547.19045.40245.34245.3420.1500.2360.37545.25245.10644.96742.78842.64242.5035H6H7H00048.00048.00048.00045.65245.71745.8020.2500.3150.40045.40245.40245.40244.14544.27044.4200.4750.6000.75043.67043.67043.6705.04h6g8g00.0710.07148.00047.92947.9290.3550.5300.85047.66547.39947.07944.75244.68144.6810.1600.2500.40044.59244.43144.28141.51241.35141.2015H6H7H00048.00048.00048.00045.01745.08745.1770.2650.3350.42544.75244.75244.75243.14743.29743.4870.5600.7100.90042.58742.58742.587Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199815Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.501.54h6g8g00.0320.03250.00049.96849.9680.1500.2360.37549.85049.73249.59349.02648.99448.9940.1000.1600.25048.92648.83448.74448.00247.91047.8205H6H7H00050.00050.00050.00049.19649.23849.2910.1700.2120.26549.02649.02649.02648.61248.67648.7510.2360.3000.37548.37648.37648.3762.04h6g8g00.0380.03850.00049.96249.9620.1800.2800.45049.82049.68249.51248.70148.66348.6630.1120.1800.28048.58948.48348.38347.35747.25147.1515H6H7H00050.00050.00050.00048.89148.93749.0010.1900.2360.30048.70148.70148.70148.13548.21048.3100.3000.3750.47547.83547.83547.8353.04h6g8g00.0480.04850.00049.95249.9520.2360.3750.60049.76449.57749.35248.05148.00348.0030.1320.2120.33547.91947.79147.66846.07145.94345.8205H6H7H00050.00050.00050.00048.27548.33148.4060.2240.2800.35548.05148.05148.05147.15247.25247.3820.4000.5000.63046.75246.75246.752521.54h6g8g00.0320.03252.00051.96851.9680.1500.2360.37551.85051.73251.59351.02650.99450.9940.1000.1600.25050.92650.83450.74450.00249.91049.8205H6H7H00052.00052.00052.00051.19651.23851.2910.1700.2120.26551.02651.02651.02650.61250.67650.7510.2360.3000.37550.37650.37650.3762.04h6g8g00.0380.03852.00051.96251.9620.1800.2800.45051.82051.68251.51250.70150.66350.6630.1120.1800.28050.58950.48350.38349.35749.25149.1515H6H7H00052.00052.00052.00050.89150.93751.0010.1900.2360.30050.70150.70150.70150.13550.21050.3100.3000.3750.47549.83549.83549.8353.04h6g8g00.0480.04852.00051.95251.9520.2360.3750.60051.76451.57751.35250.05150.00350.0030.1320.2120.33549.91949.79149.66848.07147.94347.8205H6H7H00052.00052.00052.00050.27550.33150.4060.2240.2800.35550.05150.05150.05149.15249.25249.3820.4000.5000.63048.75248.75248.7524.04h6g8g00.0600.06052.00051.94051.9400.3000.4750.75051.70051.46551.19049.40249.34249.3420.1500.2360.37549.25249.10648.96746.78846.64246.5035H6H7H00052.00052.00052.00049.65249.71749.8020.2500.3150.40049.40249.40249.40248.14548.27048.4200.4750.6000.75047.67047.67047.6705.04h6g8g00.0710.07152.00051.92951.9290.3350.5300.85051.66551.39951.07948.75248.68148.6810.1600.2500.40048.59248.43148.28145.51245.35145.2015H6H7H00052.00052.00052.00049.01749.08749.1770.2650.3350.42548.75248.75248.75247.14747.29747.6870.5600.7100.90046.58746.58746.587Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198116 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.551.54h6g8g00.0320.03255.00054.96854.9680.1500.2360.37554.85054.73254.59354.02653.99453.9940.1000.1600.25053.92653.83453.74453.00252.91052.8205H6H7H00055.00055.00055.00054.19654.23854.2910.1700.2120.26554.02654.02654.02653.61253.67653.7510.2360.3000.37553.37653.37653.3762.04h6g8g00.0380.03855.00054.96254.9620.1800.2800.45054.82054.68254.51253.70153.66353.6630.1120.1800.28053.58953.48353.38352.35752.25152.1515H6H7H00055.00055.00055.00053.89153.93754.0010.1900.2360.30053.70153.70153.70153.13553.21053.3100.3000.3750.47552.83552.83552.8353.04h6g8g00.0480.04855.00054.95254.9520.2360.3750.60054.76454.57754.35253.05153.00353.0030.1320.2120.33552.91952.79152.66851.07150.94350.8205H6H7H00055.00055.00055.00053.27553.33153.4060.2240.2800.35553.05153.05153.05152.15252.25252.3820.4000.5000.63051.75251.75251.7524.04h6g8g00.0600.06055.00054.94054.9400.3000.4750.75054.70054.46554.19052.40252.34252.3420.1500.2360.37552.25252.10651.96749.78849.64249.5035H6H7H00055.00055.00055.00052.65252.71752.8020.2500.3150.40052.40252.40252.40251.14551.27051.4200.4750.6000.75050.67050.67050.670561.54h6g8g00.0320.03256.00055.96855.9680.1500.2360.37555.85055.73255.59355.02654.99454.9940.1000.1600.25054.92654.83454.74454.00253.91053.8205H6H7H00056.00056.00056.00055.19655.23855.2910.1700.2120.26555.02655.02655.02654.61254.67654.7510.2360.3000.37554.37654.37654.3762.04h6g8g00.0380.03856.00055.96255.9620.1800.2800.45055.82055.68255.51254.70154.66354.6630.1120.1800.28054.58954.48354.38353.35753.25153.1515H6H7H00056.00056.00056.00054.89154.93755.0010.1900.2360.30054.70154.70154.70154.13554.21054.3100.3000.3750.47553.83553.83553.8353.04h6g8g00.0480.04856.00055.95255.9520.2360.3750.60055.76455.57755.35254.05154.00354.0030.1320.2120.33553.91953.79153.66852.07151.94351.8205H6H7H00056.00056.00056.00054.27554.33154.4060.2240.2800.35554.05154.05154.05153.15253.25253.3820.4000.5000.63052.75252.75252.7524.04h6g8g00.0600.06056.00055.94055.9400.3000.4750.75055.70055.46555.19053.40253.34253.3420.1500.2360.37553.25253.10652.96750.78850.64250.5035H6H7H00056.00056.00056.00053.65253.71753.8020.2500.3150.40053.40253.40253.40252.14552.27052.4300.4750.6000.75051.67051.67051.6705.54h6g8g00.0750.07556.00055.92555.9250.3550.5600.90055.64555.36555.02552.42852.35352.3530.1700.2650.42552.25852.08851.92848.87048.70048.5405H6H7H00056.00056.00056.00052.70852.78352.8780.2800.3550.45052.42852.42852.42850.64650.79650.9960.6000.7500.95050.04650.04650.046Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199817Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diameter max.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.581.54h6g8g00.0320.03258.00057.96857.9680.1500.2360.37557.85057.73257.59357.02656.99456.9940.1000.1600.25056.92656.83456.74456.00255.91055.8205H6H7H00058.00058.00058.00057.19657.23857.2910.1700.2120.26557.02657.02657.02656.61256.67656.7510.2360.3000.37556.37656.37656.3762.04h6g8g00.0380.03858.00057.96257.9620.1800.2800.45057.82057.68257.51256.70156.66356.6630.1120.1800.28056.58956.48356.38355.35755.25155.1515H6H7H00058.00058.00058.00056.89156.93757.0010.1900.2360.30056.70156.70156.70156.13556.21056.3100.3000.3750.47555.83555.83555.8353.04h6g8g00.0480.04858.00057.95257.9520.2360.3750.60057.76457.57757.35256.05156.00356.0030.1320.2120.33555.91955.79155.66854.07153.94353.8205H6H7H00058.00058.00058.00056.27556.33156.4060.2240.2800.35556.05156.05156.05155.15255.25255.3820.4000.5000.63054.75254.75254.7524.04h6g8g00.0600.06058.00057.94057.9400.3000.4750.75057.70057.46557.19055.40255.34255.3420.1500.2360.37555.25255.10654.96752.78852.64252.5035H6H7H00058.00058.00058.00055.65255.71755.8020.2500.3150.40055.40255.40255.40254.14554.27054.4200.4750.6000.75053.67053.67053.670601.54h6g8g00.0320.03260.00059.96859.9680.1500.2360.37559.85059.73259.59359.02658.99458.9940.1000.1600.25058.92658.83458.74458.00257.91057.8205H6H7H00060.00060.00060.00059.19659.23859.2910.1700.2120.26559.02659.02659.02658.61258.67658.7510.2360.3000.37558.37658.37658.3762.04h6g8g00.0380.03860.00059.96259.9620.1800.2800.45059.82059.68259.51258.70158.66358.6630.1120.1800.28058.58954.48358.38357.35757.25157.1515H6H7H00060.00060.00060.00058.89158.93759.0010.1900.2360.30058.70158.70158.70158.13558.21058.3100.3000.3750.47557.83557.83557.8353.04h6g8g00.0480.04860.00059.95259.9520.2360.3750.60059.76459.57759.35258.05158.00358.0030.1320.2120.33557.91957.79157.66856.07155.94355.8205H6H7H00060.00060.00060.00058.27558.33158.4060.2240.2800.35558.05158.05158.05157.15257.25257.3820.4000.5000.63056.75256.75256.7524.04h6g8g00.0600.06060.00059.94059.9400.3000.4750.75059.70059.46559.19057.40257.34257.3420.1500.2360.37557.25257.10656.96754.78854.64254.5035H6H7H00060.00060.00060.00057.65257.71757.8020.2500.3150.40057.40257.40257.40256.14556.27056.4200.4750.6000.75055.67055.67055.6705.54h6g8g00.0750.07560.00059.92559.9250.3550.5600.90059.64559.36559.02556.42856.35356.3530.1700.2650.42556.25856.08855.92852.87052.70052.5405H6H7H00060.00060.00060.00056.70856.78356.8780.2800.3550.45056.42856.42856.42854.64654.79654.9960.6000.7500.95054.04654.04654.046Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198118 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement All dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diameter max.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.621.54h6g8g00.0320.03262.00061.96861.9680.1500.2360.37561.85061.73261.59361.02660.99460.9940.1000.1600.25060.92660.83460.74460.00259.91059.8205H6H7H00062.00062.00062.00061.19661.23861.2910.1700.2120.26561.02661.02661.02660.61260.67660.7510.2360.3000.37560.37660.37660.37624h6g8g00.0380.03862.00061.96261.9620.1800.2800.45061.82061.68261.51260.70160.66360.6630.1120.1800.28060.58960.48360.38359.35759.25159.1515H6H7H00062.00062.00062.00060.89160.93761.0010.1900.2360.30060.70160.70160.70160.13560.21060.3100.3000.3750.47559.83559.83559.83534h6g8g00.0480.04862.00061.95261.9520.2360.3750.60061.76461.57761.35260.05160.00360.0030.1320.2120.33559.91959.79159.66858.07157.94357.8205H6H7H00062.00062.00062.00060.27560.33160.4060.2240.2800.35560.05160.05160.05159.15259.25259.3820.4000.5000.63058.75258.75258.75244h6g8g00.0600.06062.00061.94061.9400.3000.4750.75061.70061.46561.19059.40259.34259.3420.1500.2360.37559.25259.10658.96756.78856.64256.5035H6H7H00062.00062.00062.00059.65259.71759.8020.2500.3150.40059.40259.40259.40258.14558.27058.4200.4750.6000.75057.67057.67057.670641.54h6g8g00.0320.03264.00063.96863.9680.1500.2360.37563.85063.73263.59363.02662.99462.9940.1000.1600.25062.92662.83462.74462.00261.91061.8205H6H7H00064.00064.00064.00063.19663.23863.2910.1700.2120.26563.02663.02663.02662.61262.67662.7510.2360.3000.37562.37662.37662.37624h6g8g00.0380.03864.00063.96263.9620.1800.2800.45063.82063.68263.51262.70162.66362.6630.1120.1800.28062.58962.48362.38361.35761.25161.1515H6H7H00064.00064.00064.00062.89162.93763.0010.1900.2360.30062.70162.70162.70162.13562.21062.3100.3000.3750.47561.83561.83561.83534h6g8g00.0480.04864.00063.95263.9520.2360.3750.60063.76463.57763.35262.05162.00362.0030.1320.2120.33561.91961.79161.66860.07159.94359.8205H6H7H00064.00064.00064.00062.27562.33162.4060.2240.2800.35562.05162.05162.05161.15261.25261.3820.4000.5000.63060.75260.75260.75244h6g8g00.0600.06064.00063.94063.9400.3000.4750.75063.70063.46563.19061.40261.34261.3420.1500.2360.37561.25261.10660.96758.78858.64258.5035H6H7H00064.00064.00064.00061.65261.71761.8020.2500.3150.40061.40261.40261.40260.14560.27060.4200.4750.6000.75059.67059.67059.67064h6g8g00.0800.08064.00063.92063.9200.3750.6000.95063.62563.32062.97060.10360.02360.0230.1800.2800.45059.92359.74359.57356.22756.04755.8775H6H7H00064.00064.00064.00060.40360.47860.5780.3000.3750.47560.10360.10360.10358.13558.30558.5050.6300.8001.00057.50557.50557.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199819Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameter PitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diameter max.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.651.54h6g8g00.0320.03265.00064.96864.9680.1500.2360.37564.85064.73264.59364.02663.99463.9940.1000.1600.25063.92668.83463.74463.00262.91062.8205H6H7H00065.00065.00065.00064.19664.23864.2910.1700.2120.26564.02664.02664.02663.61263.67663.7510.2360.3000.37563.37663.37663.37624h6g8g00.0380.04865.00064.96264.9620.1800.2800.45064.82064.68264.51263.70163.66363.6630.1120.1800.28063.58963.48363.38362.35762.25162.1515H6H7H00065.00065.00065.00063.89163.93764.0010.1900.2360.30063.70163.70163.70163.13563.21063.3100.3000.3750.47562.83562.83562.83534h6g8g00.0480.04865.00064.95264.9520.2360.3750.60064.76464.57764.35263.05163.00363.0030.1320.2120.33562.91962.79162.66861.07160.94360.8205H6H7H00065.00065.00065.00063.27563.33163.4060.2240.2800.35563.05163.05163.05162.15262.25262.3820.4000.5000.63061.75261.75261.75244h6g8g00.0600.06065.00064.94064.9400.3000.4750.75064.70064.46564.19062.40262.34262.3420.1500.2360.37562.25262.10661.96759.78859.64269.5035H6H7H00065.00065.00065.00062.65262.71762.8020.2500.3150.40062.40262.40262.40261.14561.27061.4200.4750.6000.75060.67060.67060.670681.54h6g8g00.0320.03268.00067.96867.9680.1500.2360.37567.85067.73267.59367.02666.99466.9940.1000.1600.25066.92666.83466.74466.00265.91065.8205H6H7H00068.00068.00068.00067.19667.23867.2910.1700.2120.26567.02667.02667.02666.61266.67666.7510.2360.3000.37566.37666.37666.37624h6g8g00.0380.03868.00037.96267.9620.1800.2800.45067.82067.68267.51266.70166.66366.6630.1120.1800.28066.58966.48366.38365.35765.25165.1515H6H7H00068.00068.00068.00066.89166.93767.0010.1900.2360.30066.70166.70166.70166.13566.21066.3100.3000.3750.47565.83565.83565.83534h6g8g00.0480.04868.00067.95267.9520.2360.3750.60067.76467.57767.35266.05166.00366.0030.1320.2120.33565.91965.79165.66864.07153.94353.8205H6H7H00068.00068.00068.00066.27566.33166.4060.2240.2800.35566.05166.05166.05165.15265.25265.3820.4000.5000.63064.75264.75264.75244h6g8g00.0600.06068.00067.94067.9400.3000.4750.75067.70067.46567.19065.40265.34265.3420.1500.2360.37565.25265.10664.96762.78862.64262.5035H6H7H00068.00068.00068.00065.65265.71765.8020.2500.3150.40065.40265.40265.40264.14564.27064.4200.4750.6000.75063.67063.67063.67064h6g8g00.0800.08068.00067.92067.9200.3750.6000.95067.62567.32066.97064.10364.02364.0230.1800.2800.45063.92363.74363.57360.22760.04759.8775H6H7H00068.00068.00068.00064.40364.47864.5780.3000.3750.47564.10364.10364.10362.13562.30562.5050.6300.8001.00061.50561.50561.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198120 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.701.54h6g8g00.0320.03270.00069.96869.9680.1500.2360.37569.85069.73269.59369.02668.99468.9940.1000.1600.25068.92668.83468.74468.00267.91067.8205H6H7H00070.00070.00070.00069.19669.23869.2910.1700.2120.26569.02669.02669.02668.61268.67668.7510.2360.3000.37568.37668.37668.37624h6g8g00.0380.03870.00069.96269.9620.1800.2800.45069.82069.68269.51268.70168.66368.6630.1120.1800.28068.58968.48368.38367.35767.25167.1515H6H7H00070.00070.00070.00068.89168.93769.0010.1900.2360.30068.70168.70168.70168.13568.21068.3100.3000.3750.47567.83567.83567.83534h6g8g00.0480.04870.00069.95269.9520.2360.3750.60069.76469.57769.35268.05168.00368.0030.1320.2120.33567.91967.79167.66866.07165.94365.8205H6H7H00070.00070.00070.00068.27568.33168.4060.2240.2800.35568.05168.05168.05167.15267.25267.3820.4000.5000.63066.75266.75266.75244h6g8g00.0600.06070.00069.94069.9400.3000.4750.75069.70069.46569.19067.40267.34267.3420.1500.2360.37567.25267.10666.96764.78864.64264.5035H6H7H00070.00070.00070.00067.65267.71767.8020.2500.3150.40067.40267.40267.40266.14566.27066.4200.4750.6000.75065.67065.67065.67064h6g8g00.0800.08070.00069.92069.9200.3750.6000.95069.62569.32068.97066.10366.02366.0230.1800.2800.45065.92365.74365.57362.22762.04761.8775H6H7H00070.00070.00070.00066.40366.47866.5780.3000.3750.47566.10366.10366.10364.13564.30564.5050.6300.8001.00063.50563.50563.505721.54h6g8g00.0320.03272.00071.96871.9680.1500.2360.37571.85071.73271.59371.02670.99470.9940.1000.1600.25070.92670.83470.74470.00269.91069.8205H6H7H00072.00072.00072.00071.19671.23871.2910.1700.2120.26571.02671.02671.02670.61270.67670.7510.2360.3000.37570.37670.37670.37624h6g8g00.0380.03872.00071.96271.9620.1800.2800.45071.82071.68271.51270.70170.66370.6630.1120.1800.28070.58970.48370.38369.35769.25169.1515H6H7H00072.00072.00072.00070.89170.93771.0010.1900.2360.30070.70170.70170.70170.13570.21070.3100.3000.3750.47569.83569.83569.83534h6g8g00.0480.04872.00071.95271.9520.2360.3750.60071.76471.57771.35270.05170.00370.0030.1320.2120.33569.91969.79169.66868.07167.94367.8205H6H7H00072.00072.00072.00070.27570.33170.4060.2240.2800.35570.05170.05170.05169.15269.25269.3820.4000.5000.63068.75268.75268.75244h6g8g00.0600.06072.00071.94071.9400.3000.4750.75071.70071.46571.19069.40269.34269.3420.1500.2360.37569.25269.10669.96766.78866.64266.5035H6H7H00072.00072.00072.00069.65269.71769.8020.2500.3150.40069.40269.40269.40268.14568.27068.4200.4750.6000.75067.67067.67067.67064h6g8g00.0800.08072.00071.92071.9200.3750.6000.95071.62571.32070.97068.10368.02368.0230.1800.2800.45067.92367.74367.57364.22764.04763.8775H6H7H00072.00072.00072.00068.40368.47858.5780.3000.3750.47568.10368.10368.10366.13566.30566.5050.6300.8001.00065.50565.50565.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199821Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.751.54h6g8g00.0320.03275.00074.96874.9680.1500.2360.37574.85074.73274.59374.02673.99473.9940.1000.1600.25073.92673.83473.74473.00272.91072.8205H6H7H00075.00075.00075.00074.19674.23874.2910.1700.2120.26574.02674.02674.02673.61273.67673.7510.2360.3000.37573.37673.37673.37624h6g8g00.0380.03875.00074.96274.9620.1800.2800.45074.82074.68274.51273.70173.66373.6630.1120.1800.28073.58973.48373.38372.35772.25172.1515H6H7H00075.00075.00075.00073.89173.93774.0010.1900.2360.30073.70173.70173.70173.13573.21073.3100.3000.3750.47572.83572.83572.83534h6g8g00.0480.04875.00074.95274.9520.2360.3750.60074.76474.57774.35273.05173.00373.0030.1320.2120.33572.91972.79172.66871.07170.94370.8205H6H7H00075.00075.00075.00073.27573.33173.4060.2240.2800.35573.05173.05173.05172.15272.25272.3820.4000.5000.63071.75271.75271.75244h6g8g00.0600.06075.00074.94074.9400.3000.4750.75074.70074.46574.19072.40272.34272.3420.1500.2360.37572.25272.10671.96769.78869.64269.5035H6H7H00075.00075.00075.00072.65272.71772.8020.2500.3150.40072.40272.40272.40271.14571.27071.4200.4750.6000.75070.67070.67070.670761.54h6g8g00.0320.03276.00075.96875.9680.1500.2360.37575.85075.73275.59375.02674.99474.9940.1000.1600.25074.92674.83474.74474.00273.91073.8205H6H7H00076.00076.00076.00075.19675.23875.2910.1700.2120.26575.02675.02675.02674.61274.67674.7510.2360.3000.37574.37674.37674.37624h6g8g00.0380.03876.00075.96275.9620.1800.2800.45075.82075.68275.51274.70174.66374.6630.1120.1800.28074.58974.48374.38373.35773.25173.1515H6H7H00076.00076.00076.00074.89174.93775.0010.1900.2360.30074.70174.70174.70174.13574.21074.3100.3000.3750.47573.83573.83573.83534h6g8g00.0480.04876.00075.95275.9520.2360.3750.60075.76475.57775.35274.05174.00374.0030.1320.2120.33573.91973.79173.66872.07171.94371.8205H6H7H00076.00076.00076.00074.27574.33174.4060.2240.2800.35574.05174.05174.05173.15273.25273.3820.4000.5000.63072.75272.75272.75244h6g8g00.0600.06076.00075.94075.9400.3000.4750.75075.70075.46575.19073.40273.34273.3420.1500.2360.37573.25273.10672.96770.78870.64270.5035H6H7H00076.00076.00076.00073.65273.71773.8020.2500.3150.40073.40273.40273.40272.14572.27072.4200.4750.6000.75071.67071.67071.67064h6g8g00.0800.08076.00075.92075.9200.3750.6000.95075.62575.32074.97072.10372.02372.0230.1800.2800.45071.92371.74371.57368.22768.04767.8775H6H7H00076.00076.00076.00072.40372.47872.5780.3000.3750.47572.10372.10372.10370.13570.30570.5050.6300.8001.00069.50569.50569.5057824h6g8g00.0380.03878.00077.96277.9620.1800.2800.45077.82077.68277.51276.70176.66376.6630.1120.1800.28076.58976.48376.38375.35775.25175.1515H6H7H00078.00078.00078.00076.89176.93777.0010.1900.2360.30076.70176.70176.70176.13576.21076.3100.3000.3750.47575.83575.83575.835Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198122 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.801.54h6g8g00.0320.03280.00079.96879.9680.1500.2360.37579.85079.73279.59379.02678.99478.9940.1000.1600.25078.92678.83478.77478.00277.91077.8205H6H7H00080.00080.00080.00079.19679.23879.2910.1700.2120.26579.02679.02679.02678.61278.67678.7510.2360.3000.37578.37678.37678.37624h6g8g00.0380.03880.00079.96279.9620.1800.2800.45079.82079,68279.51278.70178.66378.6630.1120.1800.28078.58978.48378.38377.35777.25177.1515H6H7H00080.00080.00080.00078.89178.93779.0010.1900.2360.30078.70178.70178.70178.13578.21078.3100.3000.3750.47577.83577.83577.83534h6g8g00.0480.04880.00079.95279.9520.2360.3750.60079.76479.57779.35278.05178.00378.0030.1320.2120.33577.91977.79177.66876.07175.94375.8205H6H7H00080.00080.00080.00078.27578.33178.4060.2240.2800.35578.05178.05178.05177.15277.25277.3820.4000.5000.63076.75276.75276.75244h6g8g00.0600.06080.00079.94079.9400.3000.4750.75079.70079.46579.19077.40277.34277.3420.1500.2360.37577.25277.10676.96774.78874.64274.5035H6H7H00080.00080.00080.00077.65277.71777.8020.2500.3150.40077.40277.40277.40276.14576.27076.4200.4750.6000.75075.67075.67075.67064h6g8g00.0800.08080.00079.92079.9200.3750.6000.95079.62579.32078.97076.10376.02376.0230.1800.2800.45075.92375.74375.57372.22772.04771.8775H6H7H00080.00080.00080.00076.40376.47876.5780.3000.3750.47576.10376.10376.10374.13574.30574.5050.6300.8001.00073.50573.50573.5058224h6g8g00.0380.03882.00081.96281.9620.1800.2800.45081.82081.68281.51280.70180.66380.6630.1120.1800.28080.58980.48380.38379.35779.25179.1515H6H7H00082.00082.00082.00080.89180.93781.0010.1900.2360.30080.70180.70180.70180.13580.21080.3100.3000.3750.47579.83579.83579.8358524h6g8g00.0380.03885.00084.96284.9620.1800.2800.45084.82084.68284.51283.70183.66383.6630.1120.1800.28083.58983.48383.38382.35782.25182.1515H6H7H00085.00085.00085.00083.89183.93784.0010.1900.2360.30083.70183.70183.70183.13583.21083.3100.3000.3750.47582.83582.83582.83534h6g8g00.0480.04885.00084.95284.9520.2360.3750.60084.76484.57784.35283.05183.00383.0030.1320.2120.33582.91982.79182.66881.07180.94380.8205H6H7H00085.00085.00085.00083.27583.33183.4060.2240.2800.35583.05183.05183.05182.15282.25282.3820.4000.5000.63081.75281.75281.75244h6g8g00.0600.06085.00084.94084.9400.3000.4750.75084.70084.46584.19082.40282.34282.3420.1500.2360.37582.25282.10681.96779.78879.64279.5035H6H7H00085.00085.00085.00082.65282.71782.8020.2500.3150.40082.40282.40282.40281.14581.27081.4200.4750.6000.75080.67080.67080.67064h6g8g00.0800.08085.00084.92084.9200.3750.6000.95084.62584.32084.97081.10381.02381.0230.1800.2800.45080.92380.74381.57377.22777.04776.8775H6H7H00085.00085.00085.00081.40381.47881.5780.3000.3750.47581.10381.10381.10379.13579.30579.5050.6300.8001.00078.50578.50578.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199823Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.9024h6g8g00.0380.03890.00089.96289.9620.1800.2800.45089.82089.68289.51288.70188.66388.6630.1120.1800.28088.58988.48388.38387.35787.25187.1515H6H7H00090.00090.00090.00088.89188.93789.0010.1900.2360.30088.70188.70188.70188.13588.21088.3100.3000.3750.47587.83587.83587.83534h6g8g00.0480.04890.00089.95289.9520.2360.3750.60089.76489.57789.35288.05188.00388.0030.1320.2120.33587.91987.79187.66886.07185.94385.8205H6H7H00090.00090.00090.00088.27588.33188.4060.2240.2800.35588.05188.05188.05187.15287.25287.3820.4000.5000.63086.75286.75286.75244h6g8g00.0600.06090.00089.94089.9400.3000.4750.75089.70089.46589.19087.40287.34287.3420.1500.2360.37587.25287.10686.96784.78884.64284.5035H6H7H00090.00090.00090.00087.65287.71787.8020.2500.3150.40087.40287.40287.40286.14586.27086.4200.4750.6000.75085.67085.67085.67064h6g8g00.0800.08090.00089.92089.9200.3750.6000.95089.62589.32088.97086.10386.02386.0230.1800.2800.45085.92385.74385.57382.22782.04781.8775H6H7H00090.00090.00090.00086.40386.47886.5780.3000.3750.47586.10386.10386.10384.13584.30584.5050.6300.8001.00083.50583.50583.5059524h6g8g00.0380.03895.00094.96294.9620.1800.2800.45094.82094.68294.51293.70193.66393.6630.1180.1900.30093.58393.47393.36392.35192.24192.1315H6H7H00095.00095.00095.00093.90193.95194.0160.2000.2500.31593.70193.70193.70193.13593.21093.3100.3000.3750.47592.83592.83592.83534h6g8g00.0480.04895.00094.95294.9520.2360.3750.60094.76494.57794.35293.05193.00393.0030.1400.2240.35592.91192.77992.64891.06390.93190.8005H6H7H00095.00095.00095.00093.28793.35193.4260.2360.3000.37593.05193.05193.05192.15292.25292.3820.4000.5000.63091.75291.75291.75244h6g8g00.0600.06095.00094.94094.9400.3000.4750.75094.70094.46594.19092.40292.34292.3420.1600.2500.40092.24292.09291.94289.77889.62889.4785H6H7H00095.00095.00095.00092.66792.73792.8270.2650.3350.42592.40292.40292.40291.14591.27091.4200.4750.6000.75090.67090.67090.67064h6g8g00.0800.08095.00094.92094.9200.3750.6000.95094.62594.32093.97091.10391.02391.0230.1900.3000.47590.91390.72390.54887.21787.02786.8525H6H7H00095.00095.00095.00091.41891.50391.6030.3150.4000.50091.10391.10391.10389.13589.30589.5050.6300.8001.00088.50588.50588.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198124 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.10024h6g8g00.0380.038100.00099.96299.9620.1800.2800.45099.82099.68299.51298.70198.66398.6630.1180.1900.30098.58398.47398.36397.35197.24197.1315H6H7H000100.000100.000100.00098.90198.95199.0160.2000.2500.31598.70198.70198.70198.13598.21098.3100.3000.3750.47597.83597.83597.83534h6g8g00.0480.048100.00099.95299.9520.2360.3750.60099.76499.57799.35298.05198.00398.0030.1400.2240.35597.91197.77997.64896.06395.93195.8005H6H7H000100.000100.000100.00098.28798.35198.4260.2360.3000.37598.05198.05198.05197.15297.25297.3820.4000.5000.63096.75296.75296.75244h6g8g00.0600.060100.00099.94099.9400.3000.4750.75099.70099.46599.19097.40297.34297.3420.1600.2500.40097.24297.09296.94294.77894.62894.4785H6H7H000100.000100.000100.00097.66797.73797.8270.2650.3350.42597.40297.40297.40296.14596.27096.4200.4750.6000.75095.67095.67095.67064h6g8g00.0800.080100.00099.92099.9200.3750.6000.95099.62599.32098.97096.10396.02396.0230.1900.3000.47595.91395.72395.54892.21792.02791.8525H6H7H000100.000100.000100.00096.41896.50396.6030.3150.4000.50096.10396.10396.10394.13594.30594.5050.6300.8001.00093.50593.50593.50510524h6g8g00.0380.038105.000104.962104.9620.1800.2800.450104.820104.682104.512103.701103.663103.6630.1180.1900.300103.583103.473103.363102.351102.241102.1315H6H7H000105.000105.000105.000103.901103.951104.0160.2000.2500.315103.701103.701103.701103.135103.210103.3100.3000.3750.475102.835102.835102.83534h6g8g00.0480.048105.000104.952104.9520.2360.3750.600104.764104.577104.352103.051103.003103.0030.1400.2240.355102.911102.779102.648101.063100.931100.8005H6H7H000105.000105.000105.000103.287103.351103.4260.2360.3000.375103.051103.051103.051102.152102.252102.3820.4000.5000.630101.752101.752101.75244h6g8g00.0600.060105.000104.940104.9400.3000.4750.750104.700104.465104.190102.402102.342102.3420.1600.2500.400102.242102.092101.94299.77899.62899.4785H6H7H000105.000105.000105.000102.667102.737102.8270.2650.3350.425102.402102.402102.402101.145101.270101.4200.4750.6000.750100.670100.670100.67064h6g8g00.0800.080105.000104.920104.9200.3750.6000.950104.625104.320103.970101.103101.023101.0230.1900.3000.475100.913100.723100.54897.21797.02796.8525H6H7H000105.000105.000105.000101.418101.503101.6030.3150.4000.500101.103101.103101.10399.13599.30599.5050.6300.8001.00098.50598.50598.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199825Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.11024h6g8g00.0380.038110.000109.962109.9620.1800.2800.450109.820109.682109.512108.701108.663108.6630.1180.1900.300108.583108.473108.363107.351107.241107.1315H6H7H000110.000110.000110.000108.901108.951109.0160.2000.2500.315108.701108.701108.701108.135108.210108.3100.3000.3750.475107.835107.835107.83534h6g8g00.0480.048110.000109.952109.9520.2360.3750.600109.764109.577109.352108.051108.003108.0030.1400.2240.355107.911107.779107.648106.063105.931105.8005H6H7H000110.000110.000110.000108.287108.351108.4260.2360.3000.375108.051108.051108.051107.152107.252107.3820.4000.5000.630106.752106.752106.75244h6g8g00.0600.060110.000109.940109.9400.3000.4750.750109.700109.465109.190107.402107.342107.3420.1600.2500.400107.242107.092106.942104.778104.628104.4785H6H7H000110.000110.000110.000107.667107.737107.8270.2650.3350.425107.402107.402107.402106.145106.270106.4200.4750.6000.750105.670105.670105.67064h6g8g00.0800.080110.000109.920109.9200.3750.6000.950109.625109.320108.970106.103106.023106.0230.1900.3000.475105.913105.723105.548102.217102.027101.8525H6H7H000110.000110.000110.000106.418106.503106.6030.3150.4000.500106.103106.103106.103104.135104.305104.5050.6300.8001.000103.505103.505103.50511524h6g8g00.0380.038115.000114.962114.9620.1800.2800.450114.820114.682114.512113.701113.663113.6630.1180.1900.300113.583113.473113.363112.351112.241112.1315H6H7H000115.000115.000115.000113.901113.951114.0160.2000.2500.315113.701113.701113.701113.135113.210113.3100.3000.3750.475112.835112.835112.83534h6g8g00.0480.048115.000114.952114.9520.2360.3750.600114.764114.577114.352113.051113.003113.0030.1400.2240.355112.911112.779112.648111.063110.931110.8005H6H7H000115.000115.000115.000113.287113.351113.4260.2360.3000.375113.051113.051113.051112.152112.252112.3820.4000.5000.630111.752111.752111.75244h6g8g00.0600.060115.00114.940114.9400.3000.4750.750114.700114.465114.190112.402112.342112.3420.1600.2500.400112.242112.092111.942109.778109.628109.4785H6H7H000115.000115.000115.000112.667112.737112.8270.2650.3350.425112.402112.402112.402111.145111.270111.4200.4750.6000.750110.670110.670110.67064h6g8g00.0800.080115.000114.920114.9200.3750.6000.950114.625114.320113.970111.103111.023111.0230.1900.3000.475110.913110.723110.548107.217107.027106.8525H6H7H000115.000115.000115.000111.418111.503111.6030.3150.4000.500111.103111.103111.103109.135109.305109.5050.6300.8001.000108.505108.505108.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198126 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.12024h6g8g00.0380.038120.000119.962119.9620.1800.2800.450119.820119.682119.512118.701118.663118.6630.1180.1900.300118.583118.473118.363117.351117.241117.1315H6H7H000120.000120.000120.000118.901118.951119.0160.2000.2500.315118.701118.701118.701118.135118.210118.3100.3000.3750.475117.835117.835117.83534h6g8g00.0480.048120.000119.952119.9520.2360.3750.600119.764119.577119.352118.051118.003118.0030.1400.2240.355117.911117.779117.648116.063115.931115.8005H6H7H000120.000120.000120.000118.287118.351118.4260.2360.3000.375118.051118.051118.051117.152117.252117.3820.4000.5000.630116.752116.752116.75244h6g8g00.0600.060120.000119.940119.9400.3000.4750.750119.700119.465119.190117.402117.342117.3420.1600.2500.400117.242117.092116.942114.778114.628114.4785H6H7H000120.000120.000120.000117.667117.737117.8270.2650.3350.425117.402117.402117.402116.145116.270116.4200.4750.6000.750115.670115.670115.67064h6g8g00.0800.080120.000119.920119.9200.3750.6000.950119.625119.320118.970116.103116.023116.0230.1900.3000.475115.913115.723115.548112.217112.027111.8525H6H7H000120.000120.000120.000116.418116.503116.6030.3150.4000.500116.103116.103116.103114.135114.305114.5050.6300.8001.000113.505113.505113.50512524h6g8g00.0380.038125.000124.962124.9620.1800.2800.450124.820124.682124.512123.701123.663123.6630.1180.1900.300123.583123.473123.363122.351122.241122.1315H6H7H000125.000125.000125.000123.901123.951124.0160.2000.2500.315123.701123.701123.701123.135123.210123.3100.3000.3750.475122.835122.835122.83534h6g8g00.0480.048125.000124.952124.9520.2360.3750.600124.764124.577124.352123.051123.003123.0030.1400.2240.355122.911122.779122.648121.063120.931120.8005H6H7H000125.000125.000125.000123.287123.351123.4260.2360.3000.375123.051123.051123.051122.152122.252122.3820.4000.5000.630121.752121.752121.75244h6g8g00.0600.060125.000124.940124.9400.3000.4750.750124.700124.465124.190122.402122.342122.3420.1600.2500.400122.242122.092121.942119.778119.628119.4785H6H7H000125.000125.000125.000122.667122.737122.8270.2650.3350.425122.402122.402122.402121.145121.270121.4200.4750.6000.750120.670120.670120.67064h6g8g00.0800.080125.000124.920124.9200.3750.6000.950124.625124.320123.970121.103121.023121.0230.1900.3000.475120.913120.723120.548117.217117.027116.8525H6H7H000125.000125.000125.000121.418121.503121.6030.3150.4000.500121.103121.103121.103119.135119.305119.5050.6300.8001.000118.505118.505118.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199827Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.13024h6g8g00.0380.038130.000129.962129.9620.1800.2800.450129.820129.682129.512128.701128.663128.6630.1180.1900.300128.583128.473128.363127.351127.241127.1315H6H7H000130.000130.000130.000128.901128.951129.0160.2000.2500.315128.701128.701128.701128.135128.210128.3100.3000.3750.475127.835127.835127.83534h6g8g00.0480.048130.000129.952129.9520.2360.3750.600129.764129.577129.352128.051128.003128.0030.1400.2240.355127.911127.779127.648126.063125.931125.8005H6H7H000130.000130.000130.000128.287128.351128.4260.2360.3000.375128.051128.051128.051127.152127.252127.3820.4000.5000.630126.752126.752126.75244h6g8g00.0600.060130.000129.940129.9400.3000.4750.750129.700129.465129.190127.402127.342127.3420.1600.2500.400127.242127.092126.942124.778124.628124.4785H6H7H000130.000130.000130.000127.667127.737127.8270.2650.3350.425127.402127.402127.402126.145126.270126.4200.4750.6000.750125.670125.670125.67064h6g8g00.0800.080130.000129.920129.9200.3750.6000.950129.625129.320128.970126.103126.023126.0230.1900.3000.475125.913125.723125.548122.217122.027121.8525H6H7H000130.000130.000130.000126.418126.503126.6030.3150.4000.500126.103126.103126.103124.135124.305124.5050.6300.8001.000123.505123.505123.50513524h6g8g00.0380.038135.000134.962134.9620.1800.2800.450134.820134.682134.512133.701133.663133.6630.1180.1900.300133.583133.473133.363132.351132.241132.1315H6H7H000135.000135.000135.000133.901133.951134.0160.2000.2500.315133.701133.701133.701133.135133.210133.3100.3000.3750.475132.835132.835132.83534h6g8g00.0480.048135.000134.952134.9520.2360.3750.600134.764134.577134.352133.051133.003133.0030.1400.2240.355132.911132.779132.648131.063130.931130.8005H6H7H000135.000135.000135.000133.287133.351133.4260.2360.3000.375133.051133.051133.051132.152132.252132.3820.4000.5000.630131.752131.752131.75244h6g8g00.0600.060135.000134.940134.9400.3000.4750.750134.700134.465134.190132.402132.342132.3420.1600.2500.400132.242132.092131.942129.778129.628129.4785H6H7H000135.000135.000135.000132.667132.737132.8270.2650.3350.425132.402132.402132.402131.145131.270131.4200.4750.6000.750130.670130.670130.67064h6g8g00.0800.080135.000134.920134.9200.3750.6000.950134.625134.320133.970131.103131.023131.0230.1900.3000.475130.913130.723130.548127.217127.027126.8525H6H7H000135.000135.000135.000131.418131.503131.6030.3150.4000.500131.103131.103131.103129.135129.305129.5050.6300.8001.000128.505128.505128.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198128 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.14024h6g8g00.0380.038140.000139.962139.9620.1800.2800.450139.820139.682139.512138.701138.663138.6630.1180.1900.300138.583138.473138.363137.351137.241137.1315H6H7H000140.000140.000140.000138.901138.951139.0160.2000.2500.315138.701138.701138.701138.135138.210138.3100.3000.3750.475137.835137.835137.83534h6g8g00.0480.048140.000139.952139.9520.2360.3750.600139.764139.577139.352138.051138.003138.0030.1400.2240.355137.911137.779137.648136.063135.931135.8005H6H7H000140.000140.000140.000138.287138.351138.4260.2360.3000.375138.051138.051138.051137.152137.252137.3820.4000.5000.630136.752136.752136.75244h6g8g00.0600.060140.000139.940139.9400.3000.4750.750139.700139.465139.190137.402137.342137.3420.1600.2500.400137.242137.092136.942134.778134.628134.4785H6H7H000140.000140.000140.000137.667137.737137.8270.2650.3350.425137.402137.402137.402136.145136.270136.4200.4750.6000.750135.670135.670135.67064h6g8g00.0800.080140.000139.920139.9200.3750.6000.950139.625139.320138.970136.103136.023136.0230.1900.3000.475135.913135.723135.548132.217132.027131.8525H6H7H000140.000140.000140.000136.418136.503136.6030.3150.4000.500136.103136.103136.103134.135134.305134.5050.6300.8001.000133.505133.505133.50514524h6g8g00.0380.038145.000144.962144.9620.1800.2800.450144.820144.682144.512143.701143.663143.6630.1180.1900.300143.583143.473143.363142.351142.241142.1315H6H7H000145.000145.000145.000143.901143.951144.0160.2000.2500.315143.701143.701143.701143.135143.210143.3100.3000.3750.475142.835142.835142.83534h6g8g00.0480.048145.000144.952144.9520.2360.3750.600144.764144.577144.352143.051143.003143.0030.1400.2240.355142.911142.779142.648141.063140.931140.8005H6H7H000145.000145.000145.000143.287143.351143.4260.2360.3000.375143.051143.051143.051142.152142.252142.3820.4000.5000.630141.752141.752141.75244h6g8g00.0600.060145.000144.940144.9400.3000.4750.750144.700144.465144.190142.402142.342142.3420.1600.2500.400142.242142.092141.942139.778139.628139.4785H6H7H000145.000145.000145.000142.667142.737142.8270.2650.3350.425142.402142.402142.402141.145141.270141.4200.4750.6000.750140.670140.670140.67064h6g8g00.0800.080145.000144.920144.9200.3750.6000.950144.625144.320143.970141.103141.023141.0230.1900.3000.475140.913140.723140.548137.217137.027136.8525H6H7H000145.000145.000145.000141.418141.503141.6030.3150.4000.500141.103141.103141.103139.135139.305139.5050.6300.8001.000138.505138.505138.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199829Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.15024h6g8g00.0380.038150.000149.962149.9620.1800.2800.450149.820149.682149.512148.701148.663148.6630.1180.1900.300148.583148.473148.363147.351147.241147.1315H6H7H000150.000150.000150.000148.901148.951149.0160.2000.2500.315148.701148.701148.701148.135148.210148.3100.3000.3750.475147.835147.835147.83534h6g8g00.0480.048150.000149.952149.9520.2360.3750.600149.764149.577149.352148.051148.003148.0030.1400.2240.355147.911147.779147.648146.063145.931145.8005H6H7H000150.000150.000150.000148.287148.351148.4260.2360.3000.375148.051148.051148.051147.152147.252147.3820.4000.5000.630146.752146.752146.75244h6g8g00.0600.060150.000149.940149.9400.3000.4750.750149.700149.465149.190147.402147.342147.3420.1600.2500.400147.242147.092146.942144.778144.628144.4785H6H7H000150.000150.000150.000147.667147.737147.8270.2650.3350.425147.402147.402147.402146.145146.270146.4200.4750.6000.750145.670145.670145.67064h6g8g00.0800.080150.000149.920149.9200.3750.6000.950149.625149.320148.970146.103146.023146.0230.1900.3000.475145.913145.723145.548142.217142.027141.8525H6H7H000150.000150.000150.000146.418146.503146.6030.3150.4000.500146.103146.103146.103144.135144.305144.5050.6300.8001.000143.505143.505143.50515534h6g8g00.0480.048155.000154.952154.9520.2360.3750.600154.764154.577154.352153.051153.003153.0030.1400.2240.355152.911152.779152.648151.063150.931150.8005H6H7H000155.000155.000155.000153.287153.351153.4260.2360.3000.375153.051153.051153.051152.152152.252152.3820.4000.5000.630151.752151.752151.75244h6g8g00.0600.060155.000154.940154.9400.3000.4750.750154.700154.465154.190152.402152.342152.3420.1600.2500.400152.242152.092151.942149.778149.628149.4785H6H7H000155.000155.000155.000152.667152.737152.8270.2650.3350.425152.402152.402152.402151.145151.270151.4200.4750.6000.750150.670150.670150.67064h6g8g00.0800.080155.000154.920154.9200.3750.6000.950154.625154.320153.970151.103151.023151.0230.1900.3000.475150.913150.723150.548147.217147.027146.8525H6H7H000155.000155.000155.000151.418151.503151.6030.3150.4000.500151.103151.103151.103149.135149.305149.5050.6300.8001.000148.505148.505148.50516034h6g8g00.0480.048160.000159.952159.9520.2360.3750.600159.764159.577159.352158.051158.003158.0030.1400.2240.355157.911157.779157.648156.063155.931155.8005H6H7H000160.000160.000160.000158.287158.351158.4260.2360.3000.375158.051158.051158.051157.152157.252157.3820.4000.5000.630156.752156.752156.75244h6g8g00.0600.060160.000159.940159.9400.3000.4750.750159.700159.465159.190157.402157.342157.3420.1600.2500.400157.242157.092156.942154.778154.628154.4785H6H7H000160.000160.000160.000157.667157.737157.8270.2650.3350.425157.402157.402157.402156.145156.270156.4200.4750.6000.750155.670155.670155.67064h6g8g00.0800.080160.000159.920159.9200.3750.6000.950159.625159.320158.970156.103156.023156.0230.1900.3000.475155.913155.723155.548152.217152.027151.8525H6H7H000160.000160.000160.000156.418156.503156.6030.3150.4000.500156.103156.103156.103154.135154.305154.5050.6300.8001.000153.505153.505153.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198130 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.16534h6g8g00.0480.048165.000164.952164.9520.2360.3750.600164.764164.577164.352163.051163.003163.0030.1400.2240.355162.911162.779162.648161.063160.931160.8005H6H7H000165.000165.000165.000163.287163.351163.4260.2360.3000.375163.051163.051163.051162.152162.252162.3820.4000.5000.630161.752161.752161.75244h6g8g00.0600.060165.000164.940164.9400.3000.4750.750164.700164.465164.190162.402162.342162.3420.1600.2500.400162.242162.092161.942159.778159.628159.4785H6H7H000165.000165.000165.000162.667162.737162.8270.2650.3350.425162.402162.402162.402161.145161.270161.4200.4750.6000.750160.670160.670160.67064h6g8g00.0800.080165.000164.920164.9200.3750.6000.950164.625164.320163.970161.103161.023161.0230.1900.3000.475160.913160.723160.548157.217157.027156.8525H6H7H000165.000165.000165.000161.418161.503161.6030.3150.4000.500161.103161.103161.103159.135159.305159.5050.6300.8001.000158.505158.505158.50517034h6g8g00.0480.048170.000169.952169.9520.2360.3750.600169.764169.577169.352168.051168.003168.0030.1400.2240.355167.911167.779167.648166.063165.931165.8005H6H7H000170.000170.000170.000168.287168.351168.4260.2360.3000.375168.051168.051168.051167.152167.252167.3820.4000.5000.630166.752166.752166.75244h6g8g00.0600.060170.000169.940169.9400.3000.4750.750169.700169.465169.190167.402167.342167.3420.1600.2500.400167.242167.092166.942164.778164.628164.4785H6H7H000170.000170.000170.000167.667167.737167.8270.2650.3350.425167.402167.042167.402166.145166.270166.4200.4750.6000.750165.670165.670165.67064h6g8g00.0800.080170.000169.920169.9200.3750.6000.950169.625169.320168.970166.103166.023166.0230.1900.3000.475165.913165.723165.548162.217162.027161.8525H6H7H000170.000170.000170.000166.418166.503166.6030.3150.4000.500166.103166.103166.103164.135164.305164.5050.6300.8001.000163.505163.505163.50517534h6g8g00.0480.048175.000174.952174.9520.2360.3750.600174.764174.577174.352173.051173.003173.0030.1400.2240.355172.911172.779172.648171.063170.931170.8005H6H7H000175.000175.000175.000173.287173.351173.4260.2360.3000.375173.051173.051173.051172.152172.252172.3820.4000.5000.630171.752171.752171.75244h6g8g00.0600.060175.000174.940174.9400.3000.4750.750174.700174.465174.190172.402172.342172.3420.1600.2500.400172.242172.092171.942169.778169.628169.4785H6H7H000175.000175.000175.000172.667172.737172.8270.2650.3350.425172.402172.402172.402171.145171.270171.4200.4750.6000.750170.670170.670170.67064h6g8g00.0800.080175.000174.920174.9200.3750.6000.950174.625174.320173.970171.103171.023171.0230.1900.3000.475170.913170.723170.548167.217167.027166.8525H6H7H000175.000175.000175.000171.418171.503171.6030.3150.4000.500171.103171.103171.103169.135169.305169.5050.6300.8001.000168.505168.505168.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199831Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.18034h6g8g00.0480.048180.000179.952179.9520.2360.3750.600179.764179.577179.352178.051178.003178.0030.1400.2240.355177.911177.779177.648176.063175.931175.8005H6H7H000180.000180.000180.000178.287178.351178.4260.2360.3000.375178.051178.051178.051177.152177.252177.3820.4000.5000.630176.752176.752176.75244h6g8g00.0600.060180.000179.940179.9400.3000.4750.750179.700179.475179.190177.402177.342177.3420.1600.2500.400177.242177.092176.942174.778174.628174.4785H6H7H000180.000180.000180.000177.667177.737177.8270.2650.3350.425177.402177.402177.402176.145176.270176.4200.4750.6000.750175.670175.670175.67064h6g8g00.0800.080180.000179.920179.9200.3750.6000.950179.625179.320178.970176.103176.023176.0230.1900.3000.475175.913175.723175.548172.217172.027171.8525H6H7H000180.000180.000180.000176.418176.503176.6030.3150.4000.500176.103176.103176.103174.135174.305174.5050.6300.8001.000173.505173.505173.50518534h6g8g00.0480.048185.000184.952184.9520.2360.3750.600184.764184.577184.352183.051183.003183.0030.1600.2500.400182.891182.753182.603181.043180.905180.7555H6H7H000185.000185.000185.000183.316183.386183.4760.2650.3350.425183.051183.051183.051182.152182.252182.3820.4000.5000.630181.752181.752181.75244h6g8g00.0600.060185.000184.940184.9400.3000.4750.750184.700184.465184.190182.402182.342182.3420.1800.2800.450182.222182.062181.892179.758179.598179.4285H6H7H000185.000185.000185.000182.702182.777182.8770.3000.3750.475182.402182.402182.402181.145181.270181.4200.4750.6000.750180.670180.670180.67064h6g8g00.0800.080185.000184.920184.9200.3750.6000.950184.625184.320183.970181.103181.023181.0230.2000.3150.500180.903180.708180.523177.207177.012176.8275H6H7H000185.000185.000185.000181.438181.528181.6330.3350.4250.530181.103181.103181.103179.135179.305179.5050.6300.8001.000178.505178.505178.50519034h6g8g00.0480.048190.000189.952189.9520.2360.3750.600189.764189.577189.352188.051188.003188.0030.1600.2500.400187.891187.753187.603186.043185.905185.7555H6H7H000190.000190.000190.000188.316188.386188.4760.2650.3350.425188.051188.051188.051187.152187.252187.3820.4000.5000.630186.752186.752186.75244h6g8g00.0600.060190.000189.940189.9400.3000.4750.750189.700189.465189.190187.402187.342187.3420.1800.2800.450187.222187.062186.892184.758184.598184.4285H6H7H000190.000190.000190.000187.702187.777187.8770.3000.3750.475187.402187.402187.402186.145186.270186.4200.4750.6000.750185.670185.670185.67064h6g8g00.0800.080190.000189.920189.9200.3750.6000.950189.625189.320189.970186.103186.023186.0230.2000.3150.500185.903185.708185.523182.207182.012181.8275H6H7H000190.000190.000190.000186.438186.528186.6330.3350.4250.530186.103186.103186.103184.135184.305184.5050.6300.8001.000183.505183.505183.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198132 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.19534h6g8g00.0480.048195.000194.952194.9520.2360.3750.600194.764194.577194.352193.051193.003193.0030.1600.2500.400192.891192.753192.603191.043190.905190.7555H6H7H000195.000195.000195.000193.316193.386193.4760.2650.3350.425193.051193.051193.051192.152192.252192.3820.4000.5000.630191.752191.752191.75244h6g8g00.0600.060195.000194.940194.9400.3000.4750.750194.700194.465194.190192.402192.342192.3420.1800.2800.450192.222192.062191.892189.758189.598189.4285H6H7H000195.000195.000195.000192.702192.777192.8770.3000.3750.475192.402192.402192.402191.145191.270191.4200.4750.6000.750190.670190.670190.67064h6g8g00.0800.080195.000194.920194.9200.3750.6000.950194.625194.320193.970191.103191.023191.0230.2000.3150.500190.903190.708190.523187.207187.012186.8275H6H7H000195.000195.000195.000191.438191.528191.6330.3350.4250.530191.103191.103191.103189.135189.305189.5050.6300.8001.000188.505188.505188.50520034h6g8g00.0480.048200.000199.952199.9520.2360.3750.600199.764199.577199.352198.051198.003198.0030.1600.2500.400197.891197.753197.603196.043195.905195.7555H6H7H000200.000200.000200.000198.316198.386198.4760.2650.3350.425198.051198.051198.051197.152197.252197.3820.4000.5000.630196.752196.752196.75244h6g8g00.0600.060200.000199.940199.9400.3000.4750.750199.700199.465199.190197.402197.342197.3420.1800.2800.450197.222197.062196.892194.758194.598194.4285H6H7H000200.000200.000200.000197.702197.777197.8770.3000.3750.475197.402197.402197.402196.145196.270196.4200.4750.6000.750195.670195.670195.67064h6g8g00.0800.080200.000199.920199.9200.3750.6000.950199.625199.320198.970196.103196.023196.0230.2000.3150.500195.903195.708195.523192.207192.012191.8275H6H7H000200.000200.000200.000196.438196.528196.6330.3350.4250.530196.103196.103196.103194.135194.305194.5050.6300.8001.000193.505193.505193.50520534h6g8g00.0480.048205.000204.952204.9520.2360.3750.600204.764204.577204.352203.051203.003203.0030.1600.2500.400202.891202.753202.603201.043200.905200.7555H6H7H000205.000205.000205.000203.316203.386203.4760.2650.3350.425203.051203.051203.051202.152202.252202.3820.4000.5000.630201.752201.752201.75244h6g8g00.0600.060205.000204.940204.9400.3000.4750.750204.700204.465204.190202.402202.342202.3420.1800.2800.450202.222202.062201.892199.758199.598199.4285H6H7H000205.000205.000205.000202.702202.777202.8770.3000.3750.475202.402202.402202.402201.145201.270201.4200.4750.6000.750200.670200.670200.67064h6g8g00.0800.080205.000204.920204.9200.3750.6000.950204.625204.320203.970201.103201.023201.0230.2000.3150.500200.903200.708200.523197.207197.012196.8275H6H7H000205.000205.000205.000201.438201.528201.6330.3350.4250.530201.103201.103201.103199.135199.305199.5050.6300.8001.000198.505198.505198.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199833Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.21034h6g8g00.0480.048210.000209.952209.9520.2360.3750.600209.764209.577209.352208.051208.003208.0030.1600.2500.400207.891207.753207.603206.043205.905205.7555H6H7H000210.000210.000210.000208.316208.386208.4760.2650.3350.425208.051208.051208.051207.152207.252207.3820.4000.5000.630206.752206.752206.75244h6g8g00.0600.060210.000209.940209.9400.3000.4750.750209.700209.465209.190207.402207.342207.3420.1800.2800.450207.222207.062206.892204.758204.598204.4285H6H7H000210.000210.000210.000207.702207.777207.8770.3000.3750.475207.402207.402207.402206.145206.270206.4200.4750.6000.750205.670205.670205.67064h6g8g00.0800.080210.000209.920209.9200.3750.6000.950209.625209.320208.970206.103206.023206.0230.2000.3150.500205.903205.708205.523202.207202.012201.8275H6H7H000210.000210.000210.000206.438206.528206.6330.3350.4250.530206.103206.103206.103204.135204.305204.5050.6300.8001.000203.505203.505203.50521534h6g8g00.0480.048215.000214.952214.9520.2360.3750.600214.764214.577214.352213.051213.003213.0030.1600.2500.400212.891212.753212.603211.043210.905210.7555H6H7H000215.000215.000215.000213.316213.386213.4760.2650.3350.425213.051213.051213.051212.152212.252212.3820.4000.5000.630211.752211.752211.75244h6g8g00.0600.060215.000214.940214.9400.3000.4750.750214.700214.465214.190212.402212.342212.3420.1800.2800.450212.222212.062211.892209.758209.598209.4285H6H7H000215.000215.000215.000212.702212.777212.8770.3000.3750.475212.402212.402212.402211.145211.270211.4200.4750.6000.750210.670210.670210.67064h6g8g00.0800.080215.000214.920214.9200.3750.6000.950214.625214.320213.970211.103211.023211.0230.2000.3150.500210.903210.708210.523207.207207.012206.8275H6H7H000215.000215.000215.000211.438211.528211.6330.3350.4250.530211.103211.103211.103209.135209.305209.5050.6300.8001.000208.505208.505208.50522034h6g8g00.0480.048220.000219.952219.9520.2360.3750.600219.764219.577219.352218.051218.003218.0030.1600.2500.400217.891217.753217.603216.043215.905215.7555H6H7H000220.000220.000220.000218.316218.386218.4760.2650.3350.425218.051218.051218.051217.152217.252217.3820.4000.5000.630216.752216.752216.75244h6g8g00.0600.060220.000219.940219.9400.3000.4750.750219.700219.465219.190217.402217.342217.3420.1800.2800.450217.222217.062216.892214.758214.598214.4285H6H7H000220.000220.000220.000217.702217.777217.8770.3000.3750.475217.402217.402217.402216.145216.270216.4200.4750.6000.750215.670215.670215.67064h6g8g00.0800.080220.000219.920219.9200.3750.6000.950219.625219.320218.970216.103216.023216.0230.2000.3150.500215.903215.708215.523212.207212.012211.8275H6H7H000220.000220.000220.000216.438216.528216.6330.3350.4250.530216.103216.103216.103214.135214.305214.5050.6300.8001.000213.505213.505213.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198134 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.22534h6g8g00.0480.048225.000224.952224.9520.2360.3750.600224.764224.577224.352223.051223.003223.0030.1600.2500.400222.891222.753222.603221.043220.905220.7555H6H7H000225.000225.000225.000223.316223.386223.4760.2650.3350.425223.051223.051223.051222.152222.252222.3820.4000.5000.630221.752221.752221.75244h6g8g00.0600.060225.000224.940224.9400.3000.4750.750224.700224.465224.190222.402222.342222.3420.1800.2800.450222.222222.062221.892219.758219.598219.4285H6H7H000225.000225.000225.000222.702222.777222.8770.3000.3750.475222.402222.402222.402221.145221.270221.4200.4750.6000.750220.670220.670220.67064h6g8g00.0800.080225.000224.920224.9200.3750.6000.950224.625224.320223.970224.103224.023223.0230.2000.3150.500220.903220.708220.523217.207217.012216.8275H6H7H000225.000225.000225.000221.438221.528221.6330.3350.4250.530221.103221.103221.103219.135219.305219.5050.6300.8001.000218.505218.505218.50523034h6g8g00.0480.048230.000229.952229.9520.2360.3750.600229.764229.577229.352228.051228.003228.0030.1600.2500.400227.891227.753227.603226.043225.905225.7555H6H7H000230.000230.000230.000228.316228.386228.4760.2650.3350.425228.051228.051228.051227.152227.252227.3820.4000.5000.630226.752226.752226.75244h6g8g00.0600.060230.000229.940229.9400.3000.4750.750229.700229.465229.190227.402227.342227.3420.1800.2800.450227.222227.062226.892224.758224.598224.4285H6H7H000230.000230.000230.000227.702227.777227.8770.3000.3750.475227.402227.402227.402226.145226.270226.4200.4750.6000.750225.670225.670225.67064h6g8g00.0800.080230.000229.920229.9200.3750.6000.950229.625229.320228.970226.103226.023226.0230.2000.3150.500225.903225.708225.523222.207222.012221.8275H6H7H000230.000230.000230.000226.438226.528226.6330.3350.4250.530226.103226.103226.103224.135224.305224.5050.6300.8001.000223.505223.505223.50523534h6g8g00.0480.048235.000234.952234.9520.2360.3750.600234.764234.577234.352233.051233.003233.0030.1600.2500.400232.891232.753232.603231.043230.905230.7555H6H7H000235.000235.000235.000233.316233.386233.4760.2650.3350.425233.051233.051233.051232.152232.252232.3820.4000.5000.630231.752231.752231.75244h6g8g00.0600.060235.000234.940234.9400.3000.4750.750234.700234.465234.190232.402232.342232.3420.1800.2800.450232.222232.062231.892229.758229.598229.4285H6H7H000235.000235.000235.000232.702232.777232.8770.3000.3750.475232.402232.402232.402231.145231.270231.4200.4750.6000.750230.670230.670230.67064h6g8g00.0800.080235.000234.920234.9200.3750.6000.950234.625234.320233.970231.103231.023231.0230.2000.3150.500230.903230.708230.523227.207227.012226.8275H6H7H000235.000235.000235.000231.438231.528231.6330.3350.4250.530231.103231.103231.103229.135229.305229.5050.6300.8001.000228.505228.505228.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:1981 BSI 12-199835Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.24034h6g8g00.0480.048240.000239.952239.9520.2360.3750.600239.764239.577239.352238.051238.003238.0030.1600.2500.400237.891237.753237.603236.043235.905235.7555H6H7H000240.000240.000240.000238.316238.386238.4760.2650.3350.425238.051238.051238.051237.152237.252237.3820.4000.5000.630236.752236.752236.75244h6g8g00.0600.060240.000239.940239.9400.3000.4750.750239.700239.465239.190237.402237.342237.3420.1800.2800.450237.222237.062236.892234.758234.598234.4285H6H7H000240.000240.000240.000237.702237.777237.8770.3000.3750.475237.402237.402237.402236.145236.270236.4200.4750.6000.750235.670235.670235.67064h6g8g00.0800.080240.000239.920239.9200.3750.6000.950239.625239.320238.970236.103236.023236.0230.2000.3150.500235.903235.708235.523232.207232.012231.8275H6H7H000240.000240.000240.000236.438236.528236.6330.3350.4250.530236.103236.103236.103234.135234.305234.5050.6300.8001.000233.505233.505233.50524534h6g8g00.0480.048245.000244.952244.9520.2360.3750.600244.764244.577244.352243.051243.003243.0030.1600.2500.400242.891242.753242.603241.043240.905240.7555H6H7H000245.000245.000245.000243.316243.386243.4760.2650.3350.425243.051243.051243.051242.152242.252242.3820.4000.5000.630241.752241.752241.75244h6g8g00.0600.060245.000244.940244.9400.3000.4750.750244.700244.465244.190242.402242.342242.3420.1800.2800.450242.222242.062241.892239.758239.598239.4285H6H7H000245.000245.000245.000242.702242.777242.8770.3000.3750.475242.402242.402242.402241.145241.270241.4200.4750.6000.750240.670240.670240.67064h6g8g00.0800.080245.000244.920244.9200.3750.6000.950244.625244.320243.970241.103241.023241.0230.2000.3150.500240.903240.708240.523237.207237.012236.8275H6H7H000245.000245.000245.000241.438241.528241.6330.3350.4250.530241.103241.103241.103239.135239.305239.5050.6300.8001.000238.505238.505238.50525034h6g8g00.0480.048250.000249.952249.9520.2360.3750.600249.764249.577249.352248.051248.003248.0030.1600.2500.400247.891247.753247.603246.043245.905245.7555H6H7H000250.000250.000250.000248.316248.386248.4760.2650.3350.425248.051248.051248.051247.152247.252247.3820.4000.5000.630246.752246.752246.75244h6g8g00.0600.060250.000249.940249.9400.3000.4750.750249.700249.465249.190247.402247.342247.3420.1800.2800.450247.222247.062247.892244.758244.598244.4285H6H7H000250.000250.000250.000247.702247.777247.8770.3000.3750.475247.402247.402247.402246.145246.270246.4200.4750.6000.750245.670245.670245.67064h6g8g00.0800.080250.000249.920249.9200.3750.6000.950249.625249.320248.970246.103246.023246.0230.2000.3150.500245.903245.708245.523242.207242.012241.8275H6H7H000250.000250.000250.000246.438246.528246.6330.3350.4250.530246.103246.103246.103244.135244.305244.5050.6300.8001.000243.505243.505243.505Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIw w w . b z f x w . c o mBS 3643-2:198136 BSI 12-1998Table 1 ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.12345678910111213141516171819202122Nominal diameterPitchExternal threads (bolts)Internal threads (nuts)Coarse Fine Constant Tolerance classFund dev.Major diameterPitch diameterMinor diameter Tolerance classFund dev.Major diameter Pitch diameterMinor diametermax.tol.min.max.tol.min.min.min.max.tol.min.max.tol.min.25544h6g8g00.0600.060255.000254.940254.9400.3000.4750.750254.700254.465254.190252.402252.342252.3420.1800.2800.450252.222252.062251.892249.758249.598249.4285H6H7H000255.000255.000255.000252.702252.777252.8770.3000.3750.475252.402252.402252.402251.145251.270251.4200.4750.6000.750250.670250.670250.67064h6g8g00.0800.080255.000254.920254.9200.3750.6000.950254.625254.320253.970251.103251.023251.0230.2000.3150.500250.903250.708250.523247.207247.012246.8275H6H7H000255.000255.000255.000251.438251.528251.6330.3350.4250.530251.103251.103251.103249.135249.305249.5050.6300.8001.000248.505248.505248.50526044h6g8g00.0600.060260.000259.940259.9400.3000.4750.750259.700259.465259.190257.402257.342257.3420.1800.2800.450257.222257.062256.892254.758254.598254.4285H6H7H000260.000260.000260.000257.702257.777257.8770.3000.3750.475257.402257.402257.402256.145256.270256.4200.4750.6000.750255.670255.670255.67064h6g8g00.0800.080260.000259.920259.9200.3750.6000.950259.625259.320258.970256.103256.023256.0230.2000.3150.500255.903255.708255.523252.207252.012251.8275H6H7H000260.000260.000260.000256.438256.528256.6330.3350.4250.530256.103256.103256.103254.135254.305254.5050.6300.8001.000253.505253.505253.50526544h6g8g00.0600.060265.000264.940264.9400.3000.4750.750264.700264.465264.190262.402262.342262.3420.1800.2800.450262.222
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