公制美制英制螺纹对照表

1、美制细牙UNF 2A外螺纹大径UNFUN2B内螺纹小径（UN、UNF）序号规格型号最大最小公差最小最大公差17/16-2011.07910.8740.2069.72810.0330.30521/2-2012.66712.4610.20611.32811.6080.27939/16-1814.25214.0310.22112.75113.0810.3343/4-1619.01218.7730.23917.32317.6780.35657/8-1422.18421.9230.26220.26920.6760.40661(1/16)-1226.94426.6550.2924.68925.1460.4

2、5771(5/16)-1233.29433.0050.2931.03931.4960.45781(5/8)-1241.22940.940.2938.98939.4460.45791(7/8)-1247.57947.290.2945.33945.7960.457102(1/2)-1263.45263.1620.2961.21461.6710.457公制细牙6g外螺纹大径6H内螺纹小径序号规格型号最大最小公差最小最大公差1M10*19.9749.7940.188.9179.1570.242M12*1.511.96811.7320.23610.37610.6760.33M14*1.513.96813

3、.7320.23612.37612.6760.34M16*1.515.96815.7320.23614.37614.6760.35M18*1.517.96817.7320.23616.37616.6760.36M20*1.519.96819.7320.23618.37618.6760.37M22*1.521.96821.7320.23620.37620.6760.38M24*1.523.96823.7320.23622.37622.6760.39M26*1.525.96825.7320.23624.37624.6760.310M27*1.526.96826.7320.23625.37625.6

4、760.311M30*1.529.96829.7320.23628.37628.6760.312M27*226.96226.6820.2824.83525.210.37513M30*229.96229.6820.2827.83528.210.37514M33*232.96232.6820.2830.83531.210.37515M36*235.96235.6820.2833.83534.210.37516M42*241.96241.6820.2839.83540.210.375英制管螺纹序号规格型号最大最小公差最小最大公差1G1/8-289.7289.5140.2148.5668.8480.2

5、822G1/4-1913.15712.9070.2511.44511.890.4453G3/8-1916.66216.4120.2514.9515.3950.4454G1/2-1420.95520.6710.28418.63119.1720.5415G3/4-1426.44126.1570.28424.11724.6580.5416G1-1133.24932.8890.3630.29130.9310.647G11/4-1141.9141.550.3638.95239.5920.648G11/2-1147.80347.4430.3644.84545.4850.64公制/美制/英制螺纹对照表美制外

6、螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列 代号大径极限中径极限小径max螺胚直径最小最大最小最大最小8-32UNC0.15710.16310.13990.14280.12483.58(0.164-32)3.99034.14273.55353.62713.16990 10-240.18180.1890.15860.16190.13794.07(0.190-24)4.61774.80064.02844.11233.50270 12-240.20780.2150.18450.18790.16394.72(0.216-24)5.27815.4614.68634.77274.1

7、6310 1/4-200.24080.24890.21270.21640.18765.45(0.250-20)6.11636.32215.40265.49664.7655/16-180.30260.31130.27120.27520.24316.94(0.3175-18)7.6867.9076.88856.99016.17470 3/8-160.36430.37370.32870.33310.2978.4(0.375-16)9.25329.4928.3498.46077.54387/16-140.42580.43610.3850.38970.34859.83(0.4375-14)10.8153

8、11.07699.7799.89848.85190 1/2-130.48760.49850.44350.44850.404111.34(0.50-13)12.38512.661911.264911.391910.26419/16-120.54950.56090.50160.50680.458712.8(0.5625-12)13.957314.246912.740612.872711.6510 5/8-110.61130.62340.55890.56440.511914.27(0.625-11)15.52715.834414.196114.335813.00230 3/4-100.73530.7

9、4820.67730.68320.625517.28(0.750-10)18.676619.004317.203417.353315.88770 7/8-90.85920.87310.79460.80090.736820.27(0.875-9)21.823722.176720.182820.342918.71471-80.9830.9980.910.91680.844623.22(1.000-8)24.968225.349223.11423.286721.4528美制外螺纹（2A）常用规格极限尺寸表（细牙）公称尺寸和每英寸牙数螺纹系列 代号大径极限中径极限小径max螺胚直径最小最大最小最大最小

10、8-36UNF0.15770.16320.14240.14520.12913.65(0.164-36)4.00564.14533.6173.68813.279110-320.18310.18910.16580.16880.15084.24(0.190-32)4.65074.80314.21134.28753.83030 12-280.20850.2150.18860.19180.17124.82(0.216-28)5.29595.4614.79044.87174.34850 1/4-280.24250.2490.22250.22580.20525.69(0.250-28)6.15956.324

11、65.65155.73535.21215/16-240.30420.31140.28060.28430.26037.17(0.3175-24)7.72677.90967.12727.22126.61160 3/8-240.36670.37390.3430.34680.32288.75(0.375-24)9.31429.49718.71228.80878.19917/16-200.42810.43620.39950.40370.374910.19(0.4375-20)10.873711.079510.147310.2549.52250 1/2-200.49060.49870.46190.4662

12、0.437411.78(0.50-20)12.461212.66711.732311.841511.119/16-180.55240.56110.52050.5250.492913.27(0.5625-18)14.03114.251913.220713.33512.51970 5/8-180.61490.62360.58280.58750.555414.85(0.625-18)15.618515.839414.803114.922514.10720 3/4-160.73910.74850.70290.70790.671817.91(0.750-16)18.773119.011917.85371

13、7.980717.06370 7/8-140.86310.87340.82160.8270.785820.93(0.875-14)21.922722.184420.868621.005819.95931-120.98680.99820.93820.94410.89623.9(1.000-12)25.064725.354323.830323.980122.7584美制UNF螺纹常用规格UNC序号标记牙数外径内径刀具尺寸备注13/4-16UNF-2B1619.0517.3317.500.0527/8-14UNF-2B1422.22520.2620.460.0537/16-20UNF-2B2011.

14、11259.7389.880.0549/16-18UNF-2B1814.287512.7612.90.0555/8-18UNF-2B1815.87514.3514.50.05美制UN螺纹常用规格序号公称直径牙数外径内径刀具尺寸备注11-1/16-12UN-2B1226.987524.724.90.0521-5/16-12UN-2B1233.337531.0531.30.0531-5/8-12UN-2B1241.27538.9839.20.0541-3/16-12UN2B1230.162527.8728.10.05英制管螺纹常用规格序号公称直径牙数外径内径刀具尺寸备注1G1/8289.7288.

15、5668.6960.052G1/41913.15711.44511.660.053G3/81916.66214.9515.170.054G1/21420.95518.63118.90.055G3/41426.44124.11724.380.056G7/81430.20127.87728.140.05711133.24930.29130.610.058G1-1/41141.9138.95239.30.05公制螺纹常用规格序号公称直径螺距外径内径刀具尺寸备注116*1.51.51614.37614.50.05218*1.51.51816.37616.50.05322*1.51.52220.3762

16、0.50.05427*222724.835250.05533*22333O.835310.05642*224239.835400.05A型美制螺纹（UNF）常用规格外螺纹内螺纹-49/16-19牙14.2813.08-611/16-1617.4616.1-813/16-1620.6419.28-101-1425.423.57-121(3/16)-123028.32-161(7/16)-1236.5134.67-201(11/16)-1242.8641.02C型JIC37度美制UNF螺纹常用规格 外螺纹内螺纹-47/16”-2011.1110.03-51/2”-2012.711.32-69/16

17、”-1814.2813.08-83/4”-161917.68-107/8”-1422.2220.68-121(1/16)-1226.9825.15-161(5/16)-1233.3331.5-201(5/8)-1241.2839.44-241(7/8)-1247.6245.8-322(1/2)-1263.561.67英制圆柱管螺纹（BSPP）常用规格外螺纹内螺纹-41/4”-1913.15711.55-63/8”-1916.66214.95-81/2”-1420.95518.63-123/4”-1426.44124.11-161”-1133.24930.29-201(1/4)-1141.9138.95英制圆锥管螺纹（BSPT）常用规格基面大径基准距离1/4”-1913.15763/8”-1916.6626.41/2”-1420.9558.23/4”-1426.4419.51”-1133.24910.41(1/