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螺纹规格-美制、英制、公制
美制细牙UNF 2A外螺纹大（UN FUN） 2B内螺纹小径（UN、UNF）
序号 规格型号 *大 *小 公差 *小 *大 公差
1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.305
2 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.279
3 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.330
4 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.356
5 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.406
6 11/16-12 26.944 26.655 0.290 24.689 25.146 0.457
7 15/16-12 33.294 33.005 0.290 31.039 31.496 0.457
8 15/8-12 41.229 40.940 0.290 38.989 39.446 0.457
9 17/8-12 47.579 47.290 0.290 45.339 45.796 0.457
10 21/2-12 63.452 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
1 M10*1 9.974 9.794 0.180 8.917 9.157 0.240
2 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.300
3 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.300
4 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.300
5 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.300
6 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.300
7 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.300
8 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.300
9 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.300
10 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.300
11 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.300
12 M27*2 26.962 26.682 0.280 24.835 25.210 0.375
13 M30*2 29.962 29.682 0.280 27.835 28.210 0.375
14 M33*2 32.962 32.682 0.280 30.835 31.210 0.375
15 M36*2 35.962 35.682 0.280 33.835 34.210 0.375
16 M42*2 41.962 41.682 0.280 39.835 40.210 0.375
英制管螺纹
1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.282
2 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.445
3 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.445
4 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.541
5 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.541
6 G1-11 33.249 32.889 0.360 30.291 30.931 0.640
7 G11/4-11 41.910 41.550 0.360 38.952 39.592 0.640
8 G11/2-11 47.803 47.443 0.360 44.845 45.485 0.640