公制内外螺纹极限 对照表
螺纹规格-美制、英制、公制对照表
螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN 、UNF ）序号序号规格型号规格型号最大最大最小最小公差公差最小最小最大最大公差公差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 公制/美制/英制螺纹对照表给大家分享一下A 型美制螺纹（UNF ）常用规格 外螺纹外螺纹内螺纹 -4 9/16"-199/16"-19牙 14.28 14.28 13.0813.08-6 11/16''-16 11/16''-16 17.46 17.46 16.116.1-8 13/16''-16 13/16''-16 20.64 20.64 19.2819.28 -10 1''-14 1''-14 25.40 25.40 23.5723.57-12 1(3/16)''-12 1(3/16)''-12 30.00 30.00 28.3228.32-16 1(7/16)''-12 1(7/16)''-12 36.51 36.51 34.6734.67-20 1(11/16)''-12 1(11/16)''-12 42.86 42.86 41.0241.02C 型JIC37度美制UNF 螺纹常用规格 -4 7/16”-20 7/16”-20 11.11 11.11 10.0310.03 -5 1/2”-20 1/2”-20 12.70 12.70 11.32 11.32-6 9/16”-18 9/16”-18 14.28 14.28 13.0813.08-8 3/4”-16 3/4”-16 19.00 19.00 17.6817.68-10 7/8”-14 7/8”-14 22.22 22.22 20.6820.68-12 1(1/16)"-12 1(1/16)"-12 26.98 26.98 25.1525.15-16 1(5/16)"-12 1(5/16)"-12 33.33 33.33 31.531.5-20 1(5/8)"-12 1(5/8)"-12 41.28 41.28 39.4439.44 -24 1(7/8)"-12 1(7/8)"-12 47.62 47.62 45.845.8-32 2(1/2)"-12 2(1/2)"-12 63.5 63.5 61.67英制圆柱管螺纹（BSPP ）常用规格 -4 1/4”-19 1/4”-19 13.157 13.157 11.55-6 3/8”-19 3/8”-19 16.662 16.662 14.9514.95-8 1/2”-14 1/2”-14 20.955 20.955 18.6318.63 -12 3/4”-14 3/4”-14 26.441 26.441 24.11-16 1”-11 1”-11 33.249 33.249 30.29-20 1(1/4)''-11 1(1/4)''-11 41.91 41.91 38.9538.95英制圆锥管螺纹（BSPT ）常用规格 基面大径基面大径基准距离1/4”-19 1/4”-19 13.157 13.157 663/8”-19 3/8”-19 16.662 16.662 6.46.41/2”-14 1/2”-14 20.955 20.955 8.28.23/4”-14 3/4”-14 26.441 26.441 9.59.51”-11 1”-11 33.249 33.249 10.410.41(1/4)''-11 1(1/4)''-11 41.91 41.91 12.712.7美制圆锥管螺纹（NPT ）1/8”-27 1/8”-27 10.24 10.24 441/4”-18 1/4”-18 13.60 13.60 443/8”-18 3/8”-18 17.04 17.04 4.324.321/2”-14 1/2”-14 21.22 21.22 4.484.483/4”-14 3/4”-14 26.57 26.57 4.754.751”-11(1/2)” 1”-11(1/2)” 33.22 33.22 4.64.61(1/4)”-11.5 1(1/4)”-11.5 41.96 41.96 4.834.83。
公制螺纹尺寸表
14.676 14.376 14.50
17.153 16.917 17.00
16.676 16.376 16.50
16.210 15.835 16.00
19.153 18.917 19.00
18.676 18.376 18.50
18.210 17.835 18.00
21.153 20.917 21.00
13.216 13.026
15.510 15.350
15.216 15.026
17.510 17.350
17.216 17.026
16.913 16.701
19.510 19.350
19.216 19.026
18.913 18.701
21.510 21.350
21.216 21.026
20.913 20.701
9.378 9.188 9.20
9.153 8.917 9.00
8.912 8.647 8.80
11.153 10.917 11.00
10.912 10.647 10.80
10.676 10.376 10.50
13.153 12.917 13.00
12.676 12.376 12.50
15.153 14.917 15.00
10.95 13.29 12.95 15.29 14.95 17.29 16.95 16.62 19.29 18.95 18.62 21.29 20.90 20.62 23.29 22.95 22.62 26.29 25.95 25.62
公制 内螺 纹 （6H ）常 用规 格极 限尺 寸表 （细 牙）
大径
最小
3.000 4.000 5.000 6.000 8.000 8.000 10.000 10.000 10.000 12.000 12.000 12.000 14.000 14.000 16.000 16.000 18.000 18.000 18.000 20.000 20.000 20.000 22.000 22.000 22.000 24.000 24.000 24.000 27.000
公制(米制)螺纹极限尺寸
毛坯极限尺寸参考大径尺寸（非挤压加工）；螺纹山角度：60°涂色部螺距为非常用规格；螺纹山角度：60°。
单位：mm 小径大 径d maxd min 公差d 2max d 2min 公差d 3maxD minD 2max D 2min 公差D 1max D 1min 公差0.20.9830.9270.0560.8530.8050.0480.7380.2510.9330.0670.8380.7850.0530.67510.830.740.09-0.7290.750.2 1.083 1.0270.0560.9530.9050.0480.8380.25 1.1 1.0330.0670.9380.8850.0530.775 1.10.930.840.09-0.8290.850.2 1.183 1.1270.056 1.053 1.0050.0480.9380.25 1.2 1.1330.067 1.0380.9850.0530.875 1.2 1.0030.9080.095-0.9290.950.2 1.383 1.3270.056 1.253 1.2050.048 1.1380.3 1.4 1.3250.075 1.205 1.1490.056 1.014 1.4 1.28 1.2050.075 1.16 1.0750.085 1.10.2 1.583 1.5270.056 1.453 1.4030.05 1.3380.35 1.581 1.4960.085 1.354 1.2910.063 1.152 1.6 1.458 1.3730.085 1.321 1.2210.1 1.250.2 1.783 1.7270.056 1.653 1.6030.05 1.5230.35 1.781 1.6960.085 1.554 1.4910.063 1.352 1.8 1.658 1.5730.085 1.521 1.4210.1 1.450.25 1.982 1.9150.067 1.82 1.7640.056 1.6750.4 1.981 1.8860.095 1.721 1.6540.067 1.492 1.83 1.740.09 1.679 1.5670.112 1.60.25 2.182 2.1150.067 2.02 1.9640.056 1.8750.45 2.18 2.080.1 1.888 1.8170.071 1.628 2.2 2.003 1.9080.095 1.838 1.7130.125 1.750.35 2.481 2.3960.085 2.254 2.1910.063 2.052 2.5 2.358 2.2730.085 2.221 2.1210.1 2.150.45 2.48 2.380.1 2.188 2.1170.071 1.928 2.5 2.303 2.2080.095 2.138 2.0130.125 2.050.35 2.981 2.8960.085 2.754 2.6870.067 2.5523 2.863 2.7730.09 2.721 2.6210.1 2.650.5 2.98 2.8740.106 2.655 2.580.075 2.3673 2.775 2.6750.1 2.599 2.4590.14 2.50.35 3.481 3.3960.085 3.254 3.1870.067 3.052 3.5 3.363 3.2730.09 3.221 3.1210.1 3.150.6 3.479 3.3540.125 3.089 3.0040.085 2.743 3.5 3.222 3.110.112 3.01 2.850.16 2.90.5 3.98 3.8740.106 3.655 3.580.075 3.3674 3.775 3.6750.1 3.599 3.4590.14 3.50.7 3.978 3.8380.14 3.523 3.4330.09 3.1194 3.663 3.5450.118 3.422 3.2420.18 3.30.5 4.448 4.3740.074 4.155 4.080.075 3.867 4.5 4.275 4.1750.1 4.099 3.9590.1440.75 4.478 4.3380.14 3.991 3.9010.09 3.558 4.5 4.131 4.0130.118 3.878 3.6880.19 3.70.5 4.98 4.8740.106 4.655 4.580.075 4.3675 4.775 4.6750.1 4.599 4.4590.14 4.50.8 4.976 4.8260.15 4.456 4.3610.095 3.9955 4.605 4.480.125 4.334 4.1340.2 4.25.50.5(细牙） 5.48 5.3740.106 5.155 5.080.075 4.867 5.5 5.275 5.1750.1 5.099 4.9590.1450.755.978 5.8380.14 5.491 5.3910.1 5.0586 5.645 5.5130.132 5.378 5.1880.19 5.21 5.974 5.7940.18 5.324 5.2120.112 4.7476 5.5 5.350.15 5.153 4.9170.23650.756.978 6.8380.14 6.491 6.3910.1 6.0587 6.645 6.5130.132 6.378 6.1880.19 6.21 6.974 6.7940.18 6.324 6.2120.112 5.7477 6.5 6.350.15 6.153 5.9170.23660.757.9787.8380.147.4917.3910.17.05887.6457.5130.1327.3787.1880.197.2817.9747.7940.187.3247.2120.1126.74787.57.53-0.037.1536.9170.2367公称直径 d螺距 P1.61.822.211.11.21.4672.533.54大径中径中径小径钻头径4.55毛坯极限尺寸参考大径尺寸（非挤压加工）；螺纹山角度：60°涂色部螺距为非常用规格；螺纹山角度：60°。
常用公制内外螺纹极限直径表
16.676
M20×2.5 φ17.5 M20×1.5 φ18.5 M22×2.5 φ19.5 M24×3 M27×3 φ21 φ24
17.294 ～ 17.744 18.376 ～ 18.676
17.23 φ17.31 φ18.57～ φ18.63～ 18.67 φ18.78 φ19.17～ φ19.22～ 19.23 φ19.31
M20×1 19.974 19.794 19.324 19.206 18.891 19.24 19.29 M20×1.5 19.968 19.732 18.994 18.854 18.344 18.90 18.95 M20×2 19.962 19.682 18.663 18.503 17.797 18.57 18.62 M22×1 21.974 21.794 21.324 21.206 20.891 21.24 21.29 M22×1.5 21.968 21.732 20.994 20.854 20.344 20.95 20.90 M22×2 21.962 21.682 20.663 20.503 19.797 20.57 20.62 M24×1 23.974 23.794 23.324 23.199 22.891 23.23 23.29 M24×1.5 23.968 23.732 22.994 22.844 22.344 22.89 22.95 M24×2 23.962 23.682 22.663 22.493 21.797 22.57 22.62 M27×1 26.974 26.794 26.324 26.199 25.891 26.23 26.29 M27×1.5 26.968 26.732 25.944 25.844 25.344 25.89 25.95 M27×2 26.962 26.682 25.663 25.493 24.797 25.56 25.62 1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中 需验证。
公制内外螺纹极限尺寸
30 15 45 30 27.727 28.007 26.211 26.771
6g粗牙外螺纹极限尺寸
公称直
螺纹旋合长 度
径M 从 到
大径 max min
中径 max min
3 1.5 4.5 2.980 2.874 2.655 2.580
3.5 1.7 5 3.479 3.354 3.089 3.004
22×2 8 24 22 20.701 20.913 19.835 20.210
24×2 8.5 25 24 22.701 22.925 21.835 22.210
27×2 8.5 25 27 25.701 25.925 24.835 25.210
30×2 8.5 25 30 28.701 28.925 27.835 28.210.
30 15 45 9.947 29.277 27.674 27.339
小径
max min
3.995 3.787 4.747 4.495
5.747 5.495 6.438 6.158
8.128 7.808
9.819 9.457
11.508 11.114
13.508 13.114
14.891 14.446
5
2.5 7.5 5
4.480 4..605 4.134 4.334
6
396
5.350 5.500 4.917 5.153
7
397
6.350 6.500 5.917 6.153
8
4 12 8
7.188 7.348 6.647 6.912
10
5 15 10 9.026 9.206 8.376 8.676
12
6 18 12 10.863 11.063 10.106 10.441
常用公制内外螺纹极限直径表
9.153
8.917
M10x0.75
9.3
9.378
9.188
M10x05
9.5
9.52
9.4
M11X10
10
10.153
9.917
M11x075
10.3
10378
10.188
M11X1.5
10.5
10.676
10.376
M12X1.25
10.8
10.912
10.647
7.391
7.166
7.42
7.46
M8×1
7.974
7.794
7.324
7.212
6.891
7.26
7.29
M10×0.75
9.978
9.838
9.491
9.391
9.166
9.42
9.46
M10×1
9.974
9.794
9.324
9.212
8.891
9.26
9.29
M10×1.25
9.972
9.760
10.91
10.95
M14×1
13.974
13.794
13.324
13.206
12.891
13.25
13.29
M14×1.5
13.968
13.732
12.994
12.854
12.344
12.91
12.95
M16×1
15.974
15.794
15.324
15.206
14.891
15.25
15.29
M16×1.5
公制内外螺纹极限尺寸
6g细牙外螺纹极限尺寸
螺纹旋合长 公称直 度 径 M 从 到 8×1 10×1 10×1.25 12×1.25 12×1.5 14×1.5 16×1.5 18×1.5 18×2 20×1.5 20×2 22×1.5 22×2 24×2 27×2 30×2 3 3 4 4.5 5.6 5.6 5.6 5.6 8 5.6 8 5.6 8 8.5 8.5 8.5 9 9 12 13 16 16 16 16 24 16 24 16 24 25 25 25 大径 max 7.974 9.974 9.972 11.972 11.968 13.968 15.968 17.968 17.962 19.968 19.962 21.968 21.962 23.962 26.962 29.962 min 7.794 9.794 9.760 11.760 11.732 13.732 15.732 17.732 17.682 19.732 19.682 21.732 21.682 23.682 26.682 29.682 max 7.324 9.324 9.160 11.160 10.994 12.994 14.994 16.994 16.663 18.994 18.663 20.994 20.663 22.663 25.663 28.663 中径 min 7.212 9.212 9.042 11.028 10.854 12.854 14.854 16.854 16.503 18.854 18.503 20.854 20.503 22.493 25.483 28.493 max 6.747 8.747 8.438 10.438 10.128 12.128 14.128 16.128 15.508 18.128 17.508 20.128 19.508 21.508 24.508 27.508 小径 min 6.563 8.563 8.230 10.216 9.880 11.880 13.880 15.880 15.204 17.880 17.204 19.880 19.204 21.194 24.194 27.194