美制螺纹尺寸对照表

美制螺纹尺寸表 外螺纹 公称螺纹牙牙螺公差螺纹外径螺纹中径螺纹小径公差螺纹 直径规格数高距代号maxminmaxminmax代号min 0.073（#1）1-64unc640.2360.3972a1.838961.742441.582421.531621.366522b1.42494 1.8543a1.85421.757681.597661.559561.381763b1.42494 1-72unf720.210.3532a1.838961.750061.610361.56211.419862b1.4732 3a1.85421.76531.62561.590041.43513b1.4732 0.086(#2)2-56unc560.2710.45

美制螺纹尺寸表单位：mm 外螺纹内螺纹 公称螺纹牙牙螺公差螺纹外径螺纹中径螺纹小径公差螺纹小径螺纹中径螺纹外径钻孔 直径规格数高距代号maxminmaxminmax代号minmaxminmaxmin直径 0.073（#1）1-64unc640.2360.3972a1.838961.742441.582421.531621.366522b1.424941.582421.597661.66371.85421.397 1.8543a1.85421.757681.597661.559561.381763b1.424941.582421.597661.645921.85421.397 1-72unf720.210.3532a1.83896

. . 螺纹基本尺寸对照表 （以及螺纹底孔相关尺寸） 参照机械设计师首册编制 opmsm 2005年7月 . . 螺纹代号 threadcode 一、英制螺纹（螺纹牙型角55度） bsw——英国标准惠氏螺纹（粗牙） bsf——英国标准惠氏螺纹（细牙） g——直管螺纹(外螺纹分a、b两级即在螺纹中径公差有所区别，丝锥 分g、g-d)非密封性螺纹 r——锥管外螺纹（旧代号zg；kg） rc——锥管内螺纹（旧代号zg；kg） 二、美制螺纹（螺纹牙型角60度） unc——统一制粗牙螺纹（代替nc） unf——统一制细牙螺纹（代替nf） unef——统一制超细牙螺纹 un——统一制不变螺距螺纹 uns——统一制特殊螺纹 三、美制螺纹（螺纹牙型角60度） npt——一般用途锥管螺纹（旧代号z、k）（斜角为1°47'即1：16） npsc——管接头直

8 英制管螺纹基本尺寸及公差（牙形角55o）bspp 螺纹代号 基本直径内螺纹外螺纹 大径中径小径 中径 公差 小径 公差 a级b级 中径 公差 大径 公差 中径 公差 大径公 差 g1/8″× 28 9.7289.1478.566 +0.170+0.282 0 0 -0.107 0 -0.214 0 -0.214 0 -0.214 g1/4″× 19 13.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250 g3/8″× 19 16.66215.80614.950 +0.125 0 +0.445 0 0 -0.125 0 -0.250 0 -0.250 0 -0.250 g1/2″× 14 20.95519.79318.631

２ｂ max 3b max ２ｂ、３ｂ max no.1640.3971.5821.5821.425 no.2560.4541.8721.8721.694 no.3480.5292.1462.1461.941 no.4400.6352.3852.3852.156 no.5400.6352.6972.6972.487 no.6320.7942.8962.8962.642 no.8320.7943.5313.5283.302 no.10241.0583.9623.953.683 no.12241.0584.5974.594.343 1/4201.275.2685.254.976 5/16181.4116.7846.686.411 3/8161.5888.164

常用螺纹尺寸对照表 英制螺纹中国标准管螺纹公制螺纹 粗牙(unc)细牙(unf)螺纹尺寸大径(mm)小径(mm)粗牙细牙 螺纹尺寸底孔(mm)底孔螺纹尺寸底孔(mm)底孔g1/8"-289.738.5螺纹尺寸底孔(mm)螺纹尺寸底孔(mm) 3#-482.0.0785"3#-562.05.081"g1/4"-1913.211.4m2.5*0.452.1m2.5*0.352.12 4#-402.26.089"4#-482.4.935"g3/8"-1916.715.0m3*0.52.5m3*0.352.62 5#-402.6.1015"5#-442.65.104"g1/2"-1421.018.6m4*0.7

管螺纹尺寸对照表

常用 螺纹 尺寸 对照 表 英制 螺纹 中国 标准管螺 纹 公 制螺纹 粗 牙(unc) 细 牙(unf) 螺纹尺寸大径(mm)小径(mm)粗 牙 细 牙 螺纹尺寸 底孔 (mm)底孔螺纹尺寸 底孔 (mm)底孔g1/8"-289.738.5螺纹尺寸底孔(mm)螺纹尺寸底孔(mm) 3#-482.0.0785"3#-562.05.081"g1/4"-1913.211.4m2.5*0.452.1m2.5*0.352.12 4#-402.26.089"4#-482.4.935"g3/8"-1916.715.0m3*0.52.5m3*0.352.62 5#-402.6.1015"5#-442.65.104"g1/2"-1421.018.6m4

大径（基准 直径）d=d 中径d2=d2小径 d1=d1 1/16280.9070.5810.1257.7237.1426.56146.5 1分1/8280.9070.5810.1259.7289.1478.56646.5 2分dn81/4191.3370.5860.18413.15712.30111.44569.7 3分3/8191.3370.5860.18416.66215.80614.950610.1 4分dn151/221.32.82.45141.8141.1620.24920.95519.79318.631813.2 6分dn203/426.92.82.45141.8141.1620.24926.44125.27924.1171014.5

公称螺纹牙牙螺公差螺纹外径螺纹中径螺纹小径 直径规格数高距代号maxminmaxminmax 2a1.838961.742441.582421.531621.36652 3a1.85421.757681.597661.559561.38176 2a1.838961.750061.610361.56211.41986 3a1.85421.76531.62561.5901.4351 2a2.169162.065021.874521.821181.63068 3a2.18442.080261.889761.849121.64592 2a2.169162.072641.912621.861821.69672 3a2.18442.087881.927861.889761.71196

美制螺纹尺寸表单位：mm 外螺纹内螺纹 公称螺纹牙牙螺公差螺纹外径螺纹中径螺纹小径公差螺纹小径螺纹中径螺纹外径钻孔 直径规格数高距代号maxminmaxminmax代号minmaxminmaxmin直径 0.073（#1）1-64unc640.2360.3972a1.838961.742441.582421.531621.366522b1.424941.582421.597661.66371.85421.397 1.8543a1.85421.757681.597661.559561.381763b1.424941.582421.597661.645921.85421.397 1-72unf720.210.3532a1.83896

如果对你有帮助，请下载使用！ 1 美制螺纹标准对照表 美制外螺纹（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最大 8-32 unc 0.15710.16310.13990.14280.12483.583.61 (0.164-32)3.99034.14273.55353.62713.1699 10-240.18180.18900.15860.16190.1379 4.074.10(0.190-24)4.61774.80064.02844.11233.5027 12-240.20780.21500.18450.18790.16394.724.75 (0.216-24)5.27815.46104.6863

UN_美制螺纹及尺寸表

英制管螺纹基本尺寸及公差（牙形角55o）bspp 螺纹代号 基本直径内螺纹外螺纹 大径中径小径中径公差小径公差 a级b级 中径公差大径公差中径公差大径公差 g1/8″×289.7289.1478.566+0.170 +0.282 0 0 -0.107 0 -0.214 0 -0.214 0 -0.214 g1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250 g3/8″×1916.66215.80614.950 +0.125 0 +0.445 0 0 -0.125 0 -0.250 0 -0.250 0 -0.250 g1/2″×1420.95519.79318.631 +0.142 0 +

电磁阀口径螺纹尺寸对照表： 规格俗称俗称电磁阀接管口直径 英 制 螺 纹 规 格 对 照 表 g1/8″1分dn48.5mm g1/4″2分dn812mm g3/8″3分dn1015mm g1/2″4分dn1520mm g3/4″6分dn2025mm g1″1寸dn2532mm g1-1/4″1寸2分dn3240mm g1-1/2″1寸半dn4045mm g2″2寸dn5058mm (+-1mm)范围内，就是这个螺纹，不必要精确。

公称螺纹牙牙螺公差螺纹外径螺纹中径螺纹小径公差螺纹小径螺纹中径螺纹外径钻孔 直径规格数高距代号maxminmaxminmax代号minmaxminmaxmin直径 0.073（#1）1-64unc640.2360.3972a1.838961.742441.582421.531621.366522b1.424941.582421.597661.66371.85421.397 1.8543a1.85421.757681.597661.559561.381763b1.424941.582421.597661.645921.85421.397 1-72unf720.210.3532a1.838961.750061.610361.56211.419862

公称直径公称直径每寸牙数外径尺寸公称直径每寸牙数外径尺寸 d公称每寸（＂）nd（＂）nd 粗牙0.250.75粗牙320.9直径牙数3/16244.7621/8289.729 细牙0.20.8221.9（＂）n1/4206.351/41913.158 粗牙0.41.61.522.53/16243.73.75/16187.9383/81916.663 细牙0.251.751231/42055.13/8169.5251/21420.956 粗牙0.52.5粗牙323.95/16186.46.51/21212.75/81422.912 细牙0.352.65224.93/8167.87.95/81115.8753

55°圆锥管螺纹(bspt) 螺纹代 号 基本尺寸 英 寸 大径 mm d=d 螺距 mm p 每英寸牙 数 tpi 中径 mm d2=d 2 小径 外螺 纹 d3 牙型高 度 h1 圆弧尺 寸 r 底孔尺 寸 mm r1/161/16"7.7230.907287.1426.5610.5810.1256.4 r1/81/8"9.7280.907289.1478.5660.5810.1258.4 r1/41/4"13.1571.3371912.30111.4450.8560.18411.2 r3/83/8"16.6621.3371915.80614.9500.8560.18414.75 r1/21/2"20.9551.8141419.79318.6311.162

英制管螺纹基本尺寸及公差（牙形角55o）bspp 螺纹代号 基本直径内螺纹外螺纹 大径中径小径中径公差小径公差 a级b级 中径公差大径公差中径公差大径公差 g1/8″×289.7289.1478.566 +0.170+0.282 0 0 -0.107 0 -0.214 0 -0.214 0 -0.214 g1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250 g3/8″×1916.66215.80614.950 +0.125 0 +0.445 0 0 -0.125 0 -0.250 0 -0.250 0 -0.250 g1/2″×1420.95519.79318.631 +0.142 0 +

管螺纹每寸牙数大径小径底孔基准距离 1/82710.2428.736φ8.64.102 1/41813.61611.358φ11.15.786 3/81817.05514.797φ14.56.096 1/21421.22318.321φ17.98.128 3/41426.56623.667φ23.28.611 111.533.22829.694φ29.210.160 1-1/411.541.98538.451φ37.910.668 1-1/211.548.05444.520φ43.910.668 批准：审核：

常用电磁阀口径螺纹尺寸对照表 规格俗称俗称电磁阀接管口直径 g1/81分dn48.5mm g1/42分dn812mm g3/83分dn1015mm g1/24分dn1520mm g3/46分dn2025mm g11寸dn2532mm g1-1/4一寸2分dn3240mm g1-1/2一寸半dn4045mm g22寸dn5058mm （+-1mm）范围内就是这个螺纹，不需要精确

尺寸偏差尺寸 偏差 ±tr/2 磨损上限 m1.71.71.4730.30.35-0.019-0.002####0.010.0070.0120.0091.688/1.45570.00501.4677 m221.7400.350.4-0.019-0.002####0.010.0070.0120.0091.988/1.71920.00501.7312 m2.52.52.2080.390.45-0.02-0.002####0.010.0070.0120.0092.487/2.18570.00502.1977 m2.62.62.3080.390.45-0.02-0.002####0.010.0070.0120.0092.587/2.28570.00502.2977 m