管螺纹[1].doc

1/2长度单位乘25.4等于12.7mmG1/2 英制直管螺纹标准,不可换算NPT1/2美制锥管螺纹标准,不可换算UNC1/2美制粗牙螺纹,不可换算公制螺纹用螺距来表示，美英制螺纹用每英寸内的螺纹牙数来表示； 公制螺纹是60度等边牙型，英制螺纹是等腰55度牙型，美制螺纹为等腰60度牙型； 公制螺纹用公制单位（如mm），美英制螺纹用英制单位（如英寸）；“行内人”通常用“分”来称呼螺纹尺寸，一英寸等于8分，1/4英寸就是2分，以此类推。 另外还有：ISO公制螺纹标准60度；UN统一螺纹标准60度；API美国石油管螺纹标准60度；W英国惠氏螺纹标准55度。G1/4外径13.158mm,内径11.446mm，螺距1.337mm,19牙/英寸。G1/2外径20.956mm,内径18.632mm，螺距1.814mm,14牙/英寸。G1/4是英制直管螺纹，4分管牙一般说的是英制锥管螺纹，就是ZG1/4.G1/2螺纹是非螺纹密封的管螺纹，4分管牙标作R1/2，是螺纹密封的锥管外螺纹，这两组螺纹的牙型角都是55，每英寸14牙（4分管即4/8英寸口径的管子，标作1/2.怎么跑到1/4去了？）。半寸管是20毫米的管，管螺纹G1/2和M20x1.5是相近的，它们不是3/4的。你师傅那是经验派的，那是老手了。管螺纹的标称是管子的内径。G1/2指的是内径是1/2英寸的管子的外面的螺纹！但像我们没经验的实际保险起见，还是老实的用游标卡尺卡一下外圆。看看怎么样先，要是还是不能分辨就老老实实的量螺距，对照手册，绝对不会错。经验是:1:首先在常见的管螺纹里,只有G螺纹是直螺纹.2:凭经验,和M10螺栓差不多粗的是G1/8,M12是G1/4,M16是G3/8,M20是G1/2,.7/16-20表示为：统一螺纹，大径：0.4375英寸，每英寸牙数：20，细牙螺纹系列，*UNF，基本中经：0.4050英寸，外螺纹小径：0.3762英寸，内螺纹小径：0.3834英寸，适用于低强度材料上G1/2:中国GB管牙标准 圆柱直管牙、管子公称尺寸1/2英吋、螺距14牙/吋、螺丝锥度55度PS 1/2-14：日本管牙 圆柱直管内螺、管径公称1/2英吋、 螺距14/吋、螺丝锥度55度RP1/2-14:ISO提出英制密封管螺纹标准（ISO R 7）、圆柱直管内螺、管子公称尺寸1/2英吋、 螺距14/吋、螺丝锥度55度英制密封圆柱内螺纹的特征代号为：RP； 英制密封圆锥内螺纹的特征代号为：RC；管螺纹有如下几种分类,大致如下:管螺纹(英制PT) 牙深= 0.6403*(25.4/每吋牙数) (牙角55度) PT 3/4-14 (锥度管螺纹) 锥度管螺纹,锥度比1/16 3/4英吋管用,每英吋14牙 管螺纹 (PS直螺纹)(PF细牙) 牙深= 0.6403*(25.4/每吋牙数) (牙角55度) PS 3/4-14 (直形管螺纹) PF1 1/8-16 (直形管螺纹) (细牙) 直形管螺纹 3/4英吋管用,每英吋14牙 1 1/8英吋管用,每英吋16牙公制粗螺纹对照表直径X螺距(MM)底孔直径(MM)直径X螺距(MM)底孔直径(MM)M1X0.250.75M7X16M1.2X0.250.95M8X1.256.75M1.4X0.31.1M9X1.257.75M1.5X0.351.15M10X1.58.5M1.6X0.351.25M11X1.59.5M1.8X0.351.45M12X1.7510.2M12X0.410.6M14X212M2.2X0.451.75M16X214M2.5X0.452.05M18X2.515.5M3X0.52.5M20X2.517.5M3.5X0.62.9M22X2.519.5M4X0.73.3M24X321M4.5X0.753.75M27X324M5X0.84.2M30X3.520.5M6X15英制螺纹、公制螺纹对照表单位(Inch:MM)英制公制英制公制英制公制4#2.91-5/841.2754-5/8117.4755#3.21-3/444.454-3/4120.656#3.51-7/847.6254-7/8123.8257#3.9250.851278#4.22-1/853.9755-1/4133.3510#4.82-1/457.155-3/8136.52512#5.52-3/860.3255-1/2139.714#/1/46.352-1/263.55-5/8142.8751/83.1752-5/866.6755-3/4146.051/46.352-3/469.855-7/8149.2255/167.9362-7/873.0256152.43/89.525376.26-1/4158.757/1611.1133-1/879.3756-3/8161.9251/212.73-1/482.556-1/2168.2759/1614.2883-3/885.7256-5/8171.455/815.8753-1/288.96-3/4174.6253/419.053-5/892.0256-7/8177.87/822.2253-3/495.257184.15125.43-7/898.1257-1/4187.3251-1/828.5754101.67-3/8190.51-1/431.754-1/4107.957-1/2193.6751-3/834.9254-3/8111.1257-5/8196.851-1/238.14-1/2114.37-3/4200.025英制公制對照表英吋(inch) / 1=25.4mm英制(分數)公制(小數) 0123456789025.400050.800076.2000101.6000127.0000152.4000177.8000203.2000228.6001/64.0156250.396925.796951.196976.5969101.9969127.3969152.7969178.1969203.5969228.9971/32.0312500.793826.193851.593876.9938102.3938127.7938153.1938178.5938203.9938229.3943/64.0468751.190626.590651.990677.3906102.7906128.1906153.5906178.9906204.3906229.7911/16.0625001.587526.987552.387577.7875103.1875128.5875153.9875179.3875204.7875230.1885/64.0781251.984427.384452.784478.1844103.5844128.9844154.3844179.7844205.1844230.5843/32.0937502.381227.781253.181278.5812103.9812129.3812154.7812180.1812205.5812230.9817/64.1093752.778128.178153.578178.9781104.3781129.7781155.1781180.5781205.9781231.3781/8.1250003.175028.575053.975079.3750104.7750130.1750155.5750180.9750206.3750231.7759/64.1406253.571928.971954.371979.7719105.1719130.5719155.9719181.3719206.7719232.1725/32.1562503.968829.368854.768880.1688105.5688130.9688156.3688181.7688207.1688232.56911/64.1718754.365629.765655.165680.5656105.9656131.3656156.7656182.1656207.5656232.9663/16.1875004.762530.162555.562580.9625106.3625131.7625157.1625182.5625207.9625233.36213/64.2031255.159430.559455.959481.3594106.7594132.1594157.5594182.9594208.3594233.7597/32.2187505.556230.956256.356281.7562107.1562132.5562157.9562183.3562208.7562234.15615/64.2343755.953131.353156.753182.1531107.5531132.9531158.3531183.7531209.1531234.5531/4.2500006.350031.750057.150082.5500107.9500133.3500158.7500184.1500209.5500234.95017/64.2656256.746932.146957.546982.9469108.3469133.7469159.1469184.5469209.9469235.3479/32.2812507.143832.543857.943883.3438108.7438134.1438159.5438184.9438210.3438235.74419/64.2968757.540632.940658.340683.7406109.1406134.5406159.9406185.3406210.7406236.1415/16.3125007.937533.337558.737584.1375109.5375134.9375160.3375185.7375211.1375236.53821/64.3281258.334433.734459.134484.5344109.9344135.3344160.7344186.1344211.5344236.93411/32.3437508.731234.131259.531284.9312110.3312135.7312161.1312186.5312211.9312237.33123/64.3593759.128134.528159.928185.3281110.7281136.1281161.5281186.9281212.3281237.7283/8.3750009.525034.925060.325085.7250111.1250136.5250161.9250187.3250212.7250238.12525/64.3906259.921935.321960.721986.1219111.5219136.9219162.3219187.7219213.1219238.52213/32.40625010.318835.718861.118886.5188111.9188137.3188162.7188188.1188213.5188238.91927/64.42187510.715636.115161.515686.9156112.3156137.7156163.1156188.5156213.9156239.3167/16.43750011.112536.512561.912587.3125112.7125138.1125163.5125188.9125214.3125239.71229/64.45312511.509436.909462.309487.7094113.1094138.5094163.9094189.3094214.7094240.10915/32.46875011.906237.306262.706288.1062113.5062138.9062164.3062189.7062215.1062240.50631/64.48437512.303137.703163.103188.5031113.9031139.3031164.7031190.1031215.5031240.9031/2.50000012.700038.100063.500088.9000114.3000139.7000165.1000190.5000215.9000241.30033/64.51562513.096938.496963.896989.2969114.6969140.0969165.4969190.8969216.2969241.69717/32.53125013.493838.983964.293889.6938115.0938140.4938165.8938191.2938216.6938242.09435/64.54687513.890639.290664.690690.0906115.4906140.8906166.2906191.6906217.0906242.4919/16.56250014.287539.687565.087590.4875115.8875141.2875166.6875192.0875217.04875242.88837/64.57812514.684440.084465.484490.8844116.2844141.6844167.0844192.4844217.8844243.28419/32.59375015.081240.481265.881291.2812116.6812142.0812167.4812192.8812218.2812243.68139/64.60937515.478140.878166.278191.6781117.0781142.4781167.8781193.2781218.6781244.0785/8.62500015.875041.275066.675092.0750117.4750142.8750168.2750193.6750219.0750244.47541/64.64062516.271941.671967.071992.4719117.8719143.2719168.6719194.0719219.4719244.87221/32.65625016.668842.068867.468892.8688118.2688143.6688169.0688194.4688219.8688245.26943/64.67187517.065642.465667.865693.2656118.6656144.0659169.4656194.8656220.2656245.66611/16.68750017.462542.862568.262593.6625119.0625144.4625169.8625195.2625220.6625246.06245/64.70312517.859443.259468.659494.0594119.4594144.8594170.2594195.6594221.0594246.45923/32.71875018.256243.656269.056294.4562119.8562145.2562170.6562196.0562221.4562246.85647/64.73437518.653144.053169.453194.8531120.2531145.6531171.0531196.4531221.8531247.2533/4.75000019.050044.450069.850095.2500120.6500146.0500171.4500196.8500222.2500247.65049/64.76562519.446914.846970.246995.6469121.0469146.4469171.8469197.2469222.6469248.04725/32.78125019.843845.243870.643896.0438121.4438146.8438172.2438197.6438223.0438248.44451/64.79687520.240645.640671.040696.4406121.8406147.2406172.6406198.0406223.4405248.84113/16.81250020.637546.037571.437596.8375122.2375147.6375173.0375198.4375223.8375249.23853/64.82812521.034446.434471.834497.2344122.6344148.0344173.4344198.8344224.2344249.63427/32.84375021.431246.831272.231297.6312123.0312148.4312173.8312199.2312224.6312250.03155/64.85937521.828147.228172.628198.0281123.4281148.8281174.2281199.6281225.0281250.4287/8.87500022.225047.625073.025098.4250123.8250149.2250174.6250200.0250225.4250250.82557/64.89062522.621948.021973.421998.8219124.2219149.6219175.0219200.4219225.8219251.22229/32.90625023.018848.418873.818899.2188124.6188150.0188175.4188200.8188226.2188251.61959/64.92187523.415648.815674.215699.6156125.0156150.4156175.8156201.2156226.6156252.01615/16.93750023.812549.212574.6125100.0125125.4125150.8125176.2125201.6125227.0125252.41261/64.95312524.209449.609475.0094100.4094125.8094151.2094176.6094202.0094227.4094252.80931/32.96875924.606250.006275.4062100.8062126.2062151.6062177.0062202.4062227.8062253.20663/64.98437525.003150.403175.8031101.2031126.6031152.0031177.4031202.8031228.2031253.603公制、美制和英制螺纹标准NPT，PT，G都是管螺纹NPT 是 National (American) Pipe Thread 的縮寫，屬於美国標准的 60 度锥管螺纹，用於北美地區国家標准可查阅 GB/T12716-1991PT 是 Pipe Thread 的縮寫，是 55 度密封圓锥管螺纹，屬惠氏螺紋家族，多用於欧洲及英联邦国家常用於水及煤气管行业，锥度規定为 1:16 国家標准可查阅 GB/T7306-2000G 是 55 度非螺纹密封管螺纹，屬惠氏螺紋家族标记为 G 代表圓柱螺紋国家標准可查阅 GB/T7307-2001另外螺纹中的1/4、1/2、1/8 标记是指螺紋尺寸的直徑，單位是英吋行內人通常用分來稱呼螺紋尺寸，一吋等於分，1/4 吋就是分，如此類推G 好像就是管螺纹的统称(Guan)，55，60度的划分属于功能性的，俗称管圆。即螺纹由一圆柱面加工而成。ZG俗称管锥，即螺纹由一圆锥面加工而成，一般的水管接头都是这样的，老国标标注为Rc-公制螺纹用螺距来表示，美英制螺纹用每英寸内的螺纹牙数来表示，这是它们最大的区别，公制螺纹是60度等边牙型，英制螺纹是等腰55度牙型，美制螺纹60度。公制螺纹用公制单位， 美英制螺纹用英制单位。管螺纹主要用来进行管道的连接，其内外螺纹的配合紧密，有直管与锥管两种。公称直径是指所连接的管道直径，显然螺纹大径比公称直径大。1/4，1/2，1/8是英制螺纹的公称直径，单位是英寸。转载请注明出自六西格玛品质论坛 /cdb/,本贴地址:/cdb/viewthread.php?tid=45420公制、美制和英制螺纹标准 /cdb/viewthread.php?tid=45420 NPT，PT，G 都是管螺纹 NPT 是 National (American) Pipe Thread 的缩写，属於美国标准的 60 度锥管螺纹，用於北美地区国家标准可查阅 GB/T12716-1991 PT 是 Pipe Thread 的缩写，是 55 度密封圆锥管螺纹，属惠氏螺纹家族，多用於欧洲及英联邦国家常用於水及煤气管行业，锥度规定为 1:16 国家标准可查阅 GB/T7306-2000 G 是 55 度非螺纹密封管螺纹，属惠氏螺纹家族标记为 G 代表圆柱螺纹国家标准可查阅 GB/T7307-2001 另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英吋行内人通常用分来称呼螺纹尺寸，一吋等於8分，1/4 吋就是2分，如此类推 G 好像就是管螺纹的统称(Guan)，55，60度的划分属于功能性的，俗称管圆。即螺纹由一圆柱面加工而成。 ZG俗称管锥，即螺纹由一圆锥面加工而成，一般的水管接头都是这样的，老国标标注为Rc 公制螺纹用螺距来表示，美英制螺纹用每英寸内的螺纹