NPT,PT,G各种螺纹的区别2

1、公制螺纹规格,英制螺纹规格2007-06-21 14:466g外螺纹大径6H内螺纹小径序号规格型号最大最小公差最大最小公差1M10*19.974 9.794 0.180 9.157 8.917 0.240 2M12*1.511.968 11.732 0.236 10.676 10.376 0.300 3M14*1.513.968 13.732 0.236 12.676 12.376 0.300 4M16*1.515.968 15.732 0.236 14.676 14.376 0.300 5M18*1.517.968 17.732 0.236 16.676 16.376 0.300 6M20*

2、1.519.968 19.732 0.236 18.676 18.376 0.300 7M22*1.521.968 21.732 0.236 20.676 20.376 0.300 8M24*1.523.968 23.732 0.236 22.676 22.376 0.300 9M26*1.525.968 25.732 0.236 24.676 24.376 0.300 10M27*1.526.968 26.732 0.236 25.676 25.376 0.300 11M30*1.529.968 29.732 0.236 28.676 28.376 0.300 12M27*226.962 2

3、6.682 0.280 25.210 24.835 0.375 13M30*229.962 29.682 0.280 28.210 27.835 0.375 14M33*232.962 32.682 0.280 31.210 30.835 0.375 15M36*235.962 35.682 0.280 34.210 33.835 0.375 16M42*241.962 41.682 0.280 40.210 39.835 0.375 1G1/8-289.728 9.514 0.214 8.848 8.566 0.282 2G1/4-1913.157 12.907 0.250 11.890 1

4、1.445 0.445 3G3/8-1916.662 16.412 0.250 15.395 14.950 0.445 4G1/2-1420.955 20.671 0.284 19.172 18.631 0.541 5G3/4-1426.441 26.157 0.284 24.658 24.117 0.541 6G1-1133.249 32.889 0.360 30.931 30.291 0.640 7G11/4-1141.910 41.550 0.360 39.592 38.952 0.640 8G11/2-1147.803 47.443 0.360 45.485 44.845 0.640

5、螺纹规格-美制、英制、公制2007-06-21 14:49美制细牙UNF2A外螺纹大（UN FUN）                    2B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"-2011.079 10.874 0.206 9.728 10.033 0.305 21/2"-2012.667 12.461 0.206 11.328 11.6

6、08 0.279 39/16"-1814.252 14.031 0.221 12.751 13.081 0.330 43/4"-1619.012 18.773 0.239 17.323 17.678 0.356 57/8"-1422.184 21.923 0.262 20.269 20.676 0.406 611/16-1226.944 26.655 0.290 24.689 25.146 0.457 715/16-1233.294 33.005 0.290 31.039 31.496 0.457 815/8-1241.229 40.940 0.290 38.98

7、9 39.446 0.457 917/8-1247.579 47.290 0.290 45.339 45.796 0.457 1021/2-1263.452 63.162 0.290 61.214 61.671 0.457 公制细牙6g外螺纹大径6H内螺纹小径1M10*19.974 9.794 0.180 8.917 9.157 0.240 2M12*1.511.968 11.732 0.236 10.376 10.676 0.300 3M14*1.513.968 13.732 0.236 12.376 12.676 0.300 4M16*1.515.968 15.732 0.236 14.3

8、76 14.676 0.300 5M18*1.517.968 17.732 0.236 16.376 16.676 0.300 6M20*1.519.968 19.732 0.236 18.376 18.676 0.300 7M22*1.521.968 21.732 0.236 20.376 20.676 0.300 8M24*1.523.968 23.732 0.236 22.376 22.676 0.300 9M26*1.525.968 25.732 0.236 24.376 24.676 0.300 10M27*1.526.968 26.732 0.236 25.376 25.676 0

9、.300 11M30*1.529.968 29.732 0.236 28.376 28.676 0.300 12M27*226.962 26.682 0.280 24.835 25.210 0.375 13M30*229.962 29.682 0.280 27.835 28.210 0.375 14M33*232.962 32.682 0.280 30.835 31.210 0.375 15M36*235.962 35.682 0.280 33.835 34.210 0.375 16M42*241.962 41.682 0.280 39.835 40.210 0.375 英制管螺纹1G1/8-

10、289.728 9.514 0.214 8.566 8.848 0.282 2G1/4-1913.157 12.907 0.250 11.445 11.890 0.445 3G3/8-1916.662 16.412 0.250 14.950 15.395 0.445 4G1/2-1420.955 20.671 0.284 18.631 19.172 0.541 5G3/4-1426.441 26.157 0.284 24.117 24.658 0.541 6G1-1133.249 32.889 0.360 30.291 30.931 0.640 7G11/4-1141.910 41.550 0

11、.360 38.952 39.592 0.640 8G11/2-1147.803 47.443 0.360 44.845 45.485 0.640 NPT，PT，G各种螺纹的区别BSPP - 英国平行管螺纹标准NPT，PT，G都是管螺纹NPT 是 National (American Pipe Thread 的缩写，属于美国标准的 60 度锥管螺纹，用于北美地区国家标准可查阅 GB/T12716-1991PT 是 Pipe Thread 的缩写，是 55 度密封圆锥管螺纹，属惠氏螺纹家族，多用于欧洲及英联邦国家常用于水及煤气管行业，锥度规定为 1:16 国家标准可查阅 GB/T7306-2000G 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?行内人通常用分来称呼螺纹尺寸，一?等于分，1/4 ?就是分，如此类推G 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，国标标注为Rc公制螺纹