螺纹基本尺寸对照表

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1、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 +0.170 +0.282 0 0 0 0 G1/8" X28 9.728 9.147 8.566 0 -0.107 -0.214 -0.214 -0.214 G1/4" X19 13.157 12.301 11.445 +0.125 +0.445 -0.125 -0.250 -0.250 0-0.250

2、 +0.125 +0.445 0 0 0 0 G3/8" X19 16.662 15.806 14.950 0 0 -0.125 -0.250 -0.250 -0.250 +0.142 +0.541 0 0 0 0 G1/2" X14 20.955 19.793 18.631 0 0 -0.142 -0.284 -0.284 -0.284 +0.142 +0.541 0 0 0 0 G5/8" X14 22.911 21.749 20.587 0 0

3、 -0.142 -0.284 -0.284 -0.284 +0.142 +0.541 0 0 0 0 G3/4" X14 26.441 25.279 24.117 0 0 -0.142 -0.284 -0.284 -0.284 +0.180 +0.640 0 0 0 0 G1"X11 33.249 31.770 30.291 0 0 -0.180 -0.360 -0.360 -0.360 +0.180 +0.640

4、 0 0 0 0 G1.1/4" X11 41.910 40.431 38.952 0 0 -0.180 -0.360 -0.360 -0.360 +0.180 +0.640 0 0 0 0 G1.1/2" X11 47.803 46.324 44.854 0 0 -0.180 -0.360 -0.360 -0.360 +0.180 +0.640 0 0 0 0 G2"X11 59.614 58.135 56.656 0 0

5、 -0.180 -0.360 -0.360 -0.360 +0.217 +0.640 0 0 0 0 G2.1/2 ”X11 75.184 73.705 72.226 0 0 -0.217 -0.434 -0.434 -0.434 +0.217 +0.640 0 0 0 0 G3” X11 87.884 86.405 84.926 0 0 -0.217 -0.434 -0.434 -0.434 +0.217 +0.640 0 0 0 0 G3.1/

6、2 ”X11 100.330 98.851 97.372 0 0 -0.217 -0.434 -0.434 -0.434 英制锥管螺纹基本尺寸及公差（牙形角55o）BSPT 螺纹代号 基面上的直径 基准长度 有效螺纹长度 圆锥内螺纹基面轴向 位移偏差（土mr）i 大径 中径 小径 基本 最大 最小 基本 最大 最小 R1/8"X28 9.728 9.147 8.566 4.0 4.9 3.1 6.5 7.4 5.6 1.1 R1/4"X19 13.157 12.301 11.445 6.0 7.3 4.7

7、 9.7 11.0 8.4 1.7 R3/8"X19 16.662 15.806 14.950 6.4 7.7 5.1 10.1 11.4 8.8 1.7 R1/2"X14 20.955 19.793 18.631 8.2 10.0 6.4 13.2 15.0 11.4 2.3 R3/4"X14 26.441 25.279 24.117 9.5 11.3 7.7 14.5 16.3 12.7 2.3 R1"X11 33.249 31.770 30.291 10.4 12.7 8.1 16.8 19.1

8、14.5 2.9 R1.1/4"X11 41.910 40.431 38.952 12.7 15.0 10.4 19.1 21.4 16.8 2.9 R1.1/2"X11 47.803 46.324 44.845 12.7 15.0 10.4 19.1 21.4 16.8 2.9 R2"X11 59.614 58.135 56.656 15.9 18.2 13.6 23.4 25.7 21.1 2.9 R2.1/2”X11 75.184 73.705 72.226 17.5 21.0 14.0 26.7 30

9、.2 23.2 3.5 R3”X11 87.884 86.405 84.926 20.6 24.1 17.1 29.8 33.3 26.3 3.5 R3.1/2”X11 100.330 98.851 97.372 22.2 25.7 18.7 31.4 34.9 27.9 3.5 美制管螺纹基本尺寸及公差（牙形角60o）UN（F） 螺纹代号 外螺纹 内螺纹 公差等级 公差等级 2A 2B 大径 中径 小径 小径 中径 大径 最大 最小 最大 最小 最小 最大 最小 最大 JIC螺纹

10、7/16"X20UNF 11.079 10.874 10.254 10.147 9.568 9.728 10.033 10.287 10.424 11.113 1/2"X20UNF 12.667 12.461 11.841 11.732 11.156 11.328 11.608 11.875 12.017 12.7 9/16"X18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.288 3/4"X16UNF 19.012 18.773

11、 17.981 17.854 17.12 17.323 17.678 18.019 18.184 19.05 7/8"X14UNF 22.184 21.923 21.006 20.869 20.025 20.269 20.676 21.046 21.224 22.225 1-1/16"X12UN 26.944 26.655 25.57 25.425 24.425 24.689 25.146 25.613 25.801 26.988 1-5/16"X12UN 33.294 33.005 31.92 31.773 30.775

12、 31.039 31.496 31.963 32.154 33.338 1-5/8"X12UN 41.229 40.94 39.885 39.705 38.71 38.989 39.446 39.901 40.094 41.275 1-7/8"X12UN 47.579 47.29 46.205 46.053 45.06 45.339 45.796 46.251 46.449 47.625 2-1/2"X12UN 63.452 63.162 62.078 61.92 60.932 61.214 61.671 62.126 6

13、2.332 63.5 ORFS螺纹 9/16"X18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.288 11/16"X16UN 17.427 17.188 16.396 16.274 15.535 15.748 16.104 16.431 16.589 17.463 13/16"X16UN 20.599 20.361 19.568 19.444 18.707 18.923 19.279 19.606 19.766 20.638 1

14、"X14UNF 25.357 25.095 24.178 24.036 23.195 23.444 23.825 24.221 24.407 25.4 1-3/16"X12UN 30.119 29.83 28.745 28.598 27.6 27.864 28.321 28.788 28.979 30.163 1-7/16"X12UN 36.467 36.177 35.093 34.943 33.947 34.214 34.671 35.138 35.331 36.513 1-11/16"X12UN 42.817 42.52

15、7 41.443 41.29 40.297 40.564 41.021 41.488 41.686 42.863 2"X12UN 50.754 50.465 49.38 49.225 48.235 48.514 48.971 49.426 49.627 50.8 SAE螺纹 5/8"X18UNF 15.839 15.618 14.923 14.803 14.161 14.351 14.681 14.958 15.11 15.875 1-1/16"X14UN 26.947 26.683 25.743 25.608 24.7

16、4 24.968 25.375 25.783 25.961 26.987 其它美制螺纹 9/16"X16UN 14.252 14.013 13.221 13.101 12.36 12.573 12.929 13.256 13.411 14.288 7/8"X12UN 22.182 21.892 20.808 20.668 19.662 19.939 20.396 20.851 21.034 22.225 2-1/4"X12UN 57.104 56.815 55.73 55.575 54.585 54.864 55.321

17、 55.776 55.976 57.15 注：UNC粗牙螺纹系列，UNF细牙螺纹系列，UNEF超细牙螺纹系列，UN不变螺距系列 布锥管螺纹基本尺寸及公差（牙形角60o）NPT 螺纹代号 基面上的直径 螺纹长度 大径 中径 小径 有效长度 管端至基面长 Z1/8"X27 10.272 9.519 8.766 7 4.572 Z1/4"X18 13.572 12.443 11.314 9.5 5.080 Z3/8"X18 17.055 15.926 14.797 10.5 6.096 Z1/2"X14 21.223 19.772

18、18.321 13.5 8.028 Z3/4"X14 26.568 25.117 23.666 14 8.611 Z1"X11.5 33.228 31.461 29.694 17.5 10.160 Z1.1/4"X11.5 41.985 40.218 38.451 18 10.688 Z1.1/2"X11.5 48.054 46.287 44.520 18.5 10.688 Z2"X11.5 60.092 58.325 56.558 19 11.074 公制螺纹基本尺寸及公差（牙形角60o）M 螺纹代号 基本直径 内螺

19、纹 外螺纹 大径 中径 小径 公差等级 公差等级 6H 7H 6g 中径公差 小径公差 中径公差 小径公差 中径公差 大径公差 M10X1 10 9.350 8.917 +0.150 +0.236 +0.190 +0.300 -0.026 -0.026 0 0 0 0 -0.138 -0.206 M12X1 12 11.350 10.917 +0.160 +0.236 +0.200 +0.300 -0.026 -0.026 0 0 0 0 -0.144 -0.206 M14X1 14 13.35

20、0 12.917 +0.160 +0.236 +0.200 +0.300 -0.026 -0.026 0 0 0 0 -0.144 -0.206 M12X1.25 12 11.188 10.647 +0.180 +0.265 +0.224 +0.335 -0.028 -0.028 0 0 0 0 -0.160 -0.240 M14X1.25 14 13.188 12.647 +0.180 +0.265 +0.224 +0.335 -0.028 -0.028 0 0 0 0 -0.160 -0.240 M

21、12X1.5 12 11.026 10.376 +0.190 +0.300 +0.236 +0.375 -0.032 -0.032 0 0 0 0 -0.172 -0.268 M14X1.5 14 13.026 12.376 +0.190 +0.300 +0.236 +0.375 -0.032 -0.032 0 0 0 0 -0.172 -0.268 M16X1.5 16 15.026 14.376 +0.190 +0.300 +0.236 +0.375 -0.032 -0.032 0 0 0 0 -0

22、.172 -0.268 M18X1.5 18 17.026 16.373 +0.190 +0.300 +0.236 +0.375 -0.032 -0.032 0 0 0 0 -0.172 -0.268 M20X1.5 20 19.026 18.376 +0.190 +0.300 +0.236 +0.375 -0.032 -0.032 0 0 0 0 -0.172 -0.268 M22X1.5 22 21.026 20.376 +0.190 +0.300 +0.236 +0.375 -0.032 -0.032

23、 0 0 0 0 -0.172 -0.268 M24X1.5 24 23.026 22.376 +0.200 +0.300 +0.250 +0.375 -0.032 -0.032 0 0 0 0 -0.182 -0.268 M26X1.5 26 25.026 24.376 +0.200 +0.300 +0.250 +0.375 -0.032 -0.032 0 0 0 0 -0.182 -0.268 M27X1.5 27 26.026 25.376 +0.200 +0.300 +0.250 +0.375

24、-0.032 -0.032 0 0 0 0 -0.182 -0.268 M30X1.5 30 29.026 28.376 +0.200 +0.300 +0.250 +0.375 -0.032 -0.032 0 0 0 0 -0.182 -0.268 M33X1.5 33 32.026 31.376 +0.200 +0.300 +0.250 +0.375 -0.032 -0.032 0 0 0 0 -0.182 -0.268 M36X1.5 36 35.026 34.376 +0.200 +0.300 +

25、0.250 +0.375 -0.032 -0.032 0 0 0 0 -0.182 -0.268 M39X1.5 39 38.026 37.376 +0.200 +0.300 +0.250 +0.375 -0.032 -0.032 0 0 0 0 -0.182 -0.268 M42X1.5 42 41.026 40.376 +0.200 +0.300 +0.250 +0.375 -0.032 -0.032 0 0 0 0 -0.182 -0.268 M27X2 27 25.701 24.835 +0.2

26、24 +0.375 +0.280 +0.475 -0.038 -0.038 0 0 0 0 -0.208 -0.318 M30X2 30 28.701 27.835 +0.224 +0.375 +0.280 +0.475 -0.038 -0.038 0 0 0 0 -0.208 -0.318 M33X2 33 31.701 30.835 +0.224 +0.375 +0.280 +0.475 -0.038 -0.038 0 0 0 0 -0.208 -0.318 M36X2 36 34.701 33.

27、835 +0.224 +0.375 +0.280 +0.475 -0.038 -0.038 0 0 0 0 -0.208 -0.318 M39X2 39 37.701 36.835 +0.224 +0.375 +0.280 +0.475 -0.038 -0.038 0 0 0 0 -0.208 -0.318 M42X2 42 40.701 39.835 +0.224 +0.375 +0.280 +0.475 -0.038 -0.038 0 0 0 0 -0.208 -0.318 M45X2 45 43

28、.701 42.835 +0.224 +0.375 +0.280 +0.475 -0.038 -0.038 0 0 0 0 -0208 -0318 M52X2 52 50.701 49.835 +0.236 +0.375 +0.300 +0.475 -0.038 -0.038 0 0 0 0 -0.218 -0.318 M60X2 60 58.701 57.835 +0.236 +0.375 +0.300 +0.475 -0.038 -0.038 0 0 0 0 -0.218 -0.318 M64X2 64 62.701 61.835 +0.236 +0.375 +0.300 +0.475 -0.038 -0.038 0 0 0 0 -0.218 -0.318 M72X2 72 70.701 69.835 +0.236 +0.375 +0.300 +0.475 -0.038 -0.038 0 0 0 0 -0.218 -0.318