英制管螺纹基本尺寸及公差（牙形角55o） BSPP
基本直径 螺纹代号 内螺纹 A级 大径 中径 小径 中径公差 小径公差 中径公差 0 -0.107 -0.125 0 -0.125 0 -0.142 0 -0.142 0 -0.142 0 -0.180 0 -0.180 0 -0.180 0 -0.180 0 -0.217 0 -0.217 0 -0.217 大径公差 0 -0.214 -0.250 0 -0.250 0 -0.284 0 -0.284 0 -0.284 0 -0.360 0 -0.360 0 -0.360 0 -0.360 0 -0.434 0 -0.434 0 -0.434 外螺纹 B级 中径公差 0 -0.214 -0.250 0 -0.250 0 -0.284 0 -0.284 0 -0.284 0 -0.360 0 -0.360 0 -0.360 0 -0.360 0 -0.434 0 -0.434 0 -0.434 大径公差 0 -0.214 0-0.250 0 -0.250 0 -0.284 0 -0.284 0 -0.284 0 -0.360 0 -0.360 0 -0.360 0 -0.360 0 -0.434 0 -0.434 0 -0.434 G1/8″×28 G1/4″×19 G3/8″×19 G1/2″×14 G5/8″×14 G3/4″×14 G1″×11 G1.1/4″×11 G1.1/2″×11 G2″×11 G2.1/2”X11 G3”X11 G3.1/2”X11 9.728 13.157 16.662 20.955 22.911 26.441 33.249 41.910 47.803 59.614 75.184 87.884 100.330 9.147 12.301 15.806 19.793 21.749 25.279 31.770 40.431 46.324 58.135 73.705 86.405 98.851 8.566 11.445 14.950 18.631 20.587 24.117 30.291 38.952 44.854 56.656 72.226 84.926 97.372 +0.170 +0.125 +0.125 0 +0.142 0 +0.142 0 +0.142 0 +0.180 0 +0.180 0 +0.180 0 +0.180 0 +0.217 0 +0.217 0 +0.217 0 +0.282 0 +0.445 +0.445 0 +0.541 0 +0.541 0 +0.541 0 +0.640 0 +0.640 0 +0.640 0 +0.640 0 +0.640 0 +0.640 0 +0.640 0 英制锥管螺纹基本尺寸及公差（牙形角55o） BSPT
基面上的直径 螺纹代号 R1/8″×28 R1/4″×19 R3/8″×19 R1/2″×14 R3/4″×14 R1″×11 R1.1/4″×11 R1.1/2″×11 R2″×11 R2.1/2”X11 R3”X11 大径 9.728 13.157 16.662 20.955 26.441 33.249 41.910 47.803 59.614 75.184 87.884 中径 9.147 12.301 15.806 19.793 25.279 31.770 40.431 46.324 58.135 73.705 86.405 小径 8.566 11.445 14.950 18.631 24.117 30.291 38.952 44.845 56.656 72.226 84.926 基本 4.0 6.0 6.4 8.2 9.5 10.4 12.7 12.7 15.9 17.5 20.6 基准长度 最大 4.9 7.3 7.7 10.0 11.3 12.7 15.0 15.0 18.2 21.0 24.1 最小 3.1 4.7 5.1 6.4 7.7 8.1 10.4 10.4 13.6 14.0 17.1 有效螺纹长度 基本 6.5 9.7 10.1 13.2 14.5 16.8 19.1 19.1 23.4 26.7 29.8 最大 7.4 11.0 11.4 15.0 16.3 19.1 21.4 21.4 25.7 30.2 33.3 最小 5.6 8.4 8.8 11.4 12.7 14.5 16.8 16.8 21.1 23.2 26.3 圆锥内螺纹基面轴向位移偏差（±mm） 1.1 1.7 1.7 2.3 2.3 2.9 2.9 2.9 2.9 3.5 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)
外螺纹 公差等级 螺纹代号 大径 最大 最小 最大 2A 中径 最小 JIC螺纹 7/16″×20UNF 1/2″×20UNF 9/16″×18UNF 3/4″×16UNF 7/8″×14UNF 1-1/16″×12UN 1-5/16″×12UN 1-5/8″×12UN 1-7/8″×12UN 2-1/2″×12UN 9/16″×18UNF 11/16″×16UN 13/16″×16UN 1″×14UNF 1-3/16″×12UN 1-7/16″×12UN 1-11/16″×12UN 2″×12UN 5/8″×18UNF 1-1/16″×14UN 9/16″×16UN 7/8″×12UN 2-1/4″×12UN 11.079 12.667 14.252 19.012 22.184 26.944 33.294 41.229 47.579 63.452 14.252 17.427 20.599 25.357 30.119 36.467 42.817 50.754 15.839 26.947 14.252 22.182 57.104 10.874 12.461 14.031 18.773 21.923 26.655 33.005 40.94 47.29 63.162 14.031 17.188 20.361 25.095 29.83 36.177 42.527 50.465 15.618 26.683 14.013 21.892 56.815 10.254 11.841 13.335 17.981 21.006 25.57 31.92 39.885 46.205 62.078 13.335 16.396 19.568 24.178 28.745 35.093 41.443 49.38 14.923 25.743 13.221 20.808 55.73 10.147 11.732 13.221 17.854 20.869 25.425 31.773 39.705 46.053 61.92 13.221 16.274 19.444 24.036 28.598 34.943 41.29 49.225 14.803 25.608 13.101 20.668 55.575 9.568 11.156 12.573 17.12 20.025 24.425 30.775 38.71 45.06 60.932 12.573 15.535 18.707 23.195 27.6 33.947 40.297 48.235 14.161 24.74 12.36 19.662 54.585 9.728 11.328 12.751 17.323 20.269 24.689 31.039 38.989 45.339 61.214 12.751 15.748 18.923 23.444 27.864 34.214 40.564 48.514 14.351 24.968 12.573 19.939 54.864 10.033 11.608 13.081 17.678 20.676 25.146 31.496 39.446 45.796 61.671 13.081 16.104 19.279 23.825 28.321 34.671 41.021 48.971 14.681 25.375 12.929 20.396 55.321 10.287 11.875 13.371 18.019 21.046 25.613 31.963 39.901 46.251 62.126 13.371 16.431 19.606 24.221 28.788 35.138 41.488 49.426 14.958 25.783 13.256 20.851 55.776 10.424 12.017 13.52 18.184 21.224 25.801 32.154 40.094 46.449 62.332 13.52 16.589 19.766 24.407 28.979 35.331 41.686 49.627 15.11 25.961 13.411 21.034 55.976 11.113 12.7 14.288 19.05 22.225 26.988 33.338 41.275 47.625 63.5 14.288 17.463 20.638 25.4 30.163 36.513 42.863 50.8 15.875 26.987 14.288 22.225 57.15 小径 最小 小径 最大 最小 内螺纹 公差等级 2B 中径 最大 大径 ORFS螺纹 SAE螺纹 其它美制螺纹 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 Z1/8″×27 Z1/4″×18 Z3/8″×18 Z1/2″×14 Z3/4″×14 Z1″×11.5 Z1.1/4″×11.5 基面上的直径 大径 10.272 13.572 17.055 21.223 26.568 33.228 41.985 中径 9.519 12.443 15.926 19.772 25.117 31.461 40.218 小径 8.766 11.314 14.797 18.321 23.666 29.694 38.451 有效长度 7 9.5 10.5 13.5 14 17.5 18 螺纹长度 管端至基面长 4.572 5.080 6.096 8.028 8.611 10.160 10.688 Z1.1/2″×11.5 Z2″×11.5 48.054 60.092 46.287 58.325 44.520 56.558 18.5 19 10.688 11.074 公制螺纹基本尺寸及公差(牙形角60o) M
基本直径 螺纹代号 内 螺 纹 公 差 等 级 大 径 中 径 小 径 中径公差 +0.150 0 +0.160 0 +0.160 0 +0.180 0 +0.180 0 +0.190 0 +0.190 0 +0.190 0 +0.190 0 +0.190 0 +0.190 0 +0.200 0 +0.200 0 +0.200 0 +0.200 0 +0.200 0 +0.200 0 +0.200 0 +0.200 0 +0.224 0 +0.224 0 +0.224 0 +0.224 0 +0.224 0 +0.224 0 +0.224 0 +0.236 0 +0.236 0 +0.236 0 +0.236 0 6H 小径公差 +0.236 0 +0.236 0 +0.236 0 +0.265 0 +0.265 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 中径公差 +0.190 0 +0.200 0 +0.200 0 +0.224 0 +0.224 0 +0.236 0 +0.236 0 +0.236 0 +0.236 0 +0.236 0 +0.236 0 +0.250 0 +0.250 0 +0.250 0 +0.250 0 +0.250 0 +0.250 0 +0.250 0 +0.250 0 +0.280 0 +0.280 0 +0.280 0 +0.280 0 +0.280 0 +0.280 0 +0.280 0 +0.300 0 +0.300 0 +0.300 0 +0.300 0 7H 小径公差 +0.300 0 +0.300 0 +0.300 0 +0.335 0 +0.335 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.375 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 +0.475 0 中径公差 -0.026 -0.138 -0.026 -0.144 -0.026 -0.144 -0.028 -0.160 -0.028 -0.160 -0.032 -0.172 -0.032 -0.172 -0.032 -0.172 -0.032 -0.172 -0.032 -0.172 -0.032 -0.172 -0.032 -0.182 -0.032 -0.182 -0.032 -0.182 -0.032 -0.182 -0.032 -0.182 -0.032 -0.182 -0.032 -0.182 -0.032 -0.182 -0.038 -0.208 -0.038 -0.208 -0.038 -0.208 -0.038 -0.208 -0.038 -0.208 -0.038 -0.208 -0.038 -0.208 -0.038 -0.218 -0.038 -0.218 -0.038 -0.218 -0.038 -0.218 外螺纹 公差等级 6g 大径公差 -0.026 -0.206 -0.026 -0.206 -0.026 -0.206 -0.028 -0.240 -0.028 -0.240 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.032 -0.268 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 -0.038 -0.318 M10X1 M12X1 M14X1 M12X1.25 M14X1.25 M12X1.5 M14X1.5 M16X1.5 M18X1.5 M20X1.5 M22X1.5 M24X1.5 M26X1.5 M27X1.5 M30X1.5 M33X1.5 M36X1.5 M39X1.5 M42X1.5 M27X2 M30X2 M33X2 M36X2 M39X2 M42X2 M45X2 M52X2 M60X2 M64X2 M72X2
10 12 14 12 14 12 14 16 18 20 22 24 26 27 30 33 36 39 42 27 30 33 36 39 42 45 52 60 64 72 9.350 11.350 13.350 11.188 13.188 11.026 13.026 15.026 17.026 19.026 21.026 23.026 25.026 26.026 29.026 32.026 35.026 38.026 41.026 25.701 28.701 31.701 34.701 37.701 40.701 43.701 50.701 58.701 62.701 70.701 8.917 10.917 12.917 10.647 12.647 10.376 12.376 14.376 16.373 18.376 20.376 22.376 24.376 25.376 28.376 31.376 34.376 37.376 40.376 24.835 27.835 30.835 33.835 36.835 39.835 42.835 49.835 57.835 61.835 69.835
螺纹基本尺寸对照表 - 图文
