各国标准螺纹基本尺寸对照表.doc

英制管螺纹基本尺寸及公差（牙形角 55º） BSPP基本直径 内螺纹 外螺纹A 级 B 级螺纹代号大径 中径 小径 中径公差 小径公差 中径公差 大径公差 中径公差 大径公差G1/8″×28 9.728 9.147 8.566+0.170 +0.28200-0.1070-0.2140-0.2140-0.214G1/4″×19 13.157 12.301 11.445 +0.125 +0.445 -0.125 -0.250 -0.250 0-0.250G3/8″×19 16.662 15.806 14.950+0.1250+0.44500-0.1250-0.2500-0.2500-0.250G1/2″×14 20.955 19.793 18.631+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G5/8″×14 22.911 21.749 20.587+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G3/4″×14 26.441 25.279 24.117+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G1″×11 33.249 31.770 30.291+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G1.1/4″×11 41.910 40.431 38.952+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G1.1/2″×11 47.803 46.324 44.854+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G2″×11 59.614 58.135 56.656+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G2.1/2”X11 75.184 73.705 72.226 +0.2170 +0.6400 0-0.217 0-0.434 0-0.434 0-0.434G3”X11 87.884 86.405 84.926 +0.2170 +0.6400 0-0.217 0-0.434 0-0.434 0-0.434G3.1/2”X11 100.330 98.851 97.372 +0.2170 +0.6400 0-0.217 0-0.434 0-0.434 0-0.434英制锥管螺纹基本尺寸及公差（牙形角 55º） BSPT基面上的直径 基准长度 有效螺纹长度螺纹代号 大径 中径 小径 基本 最大 最小 基本 最大 最小 圆锥内螺纹基面轴向位移偏差（±mm）R1/8″×28 9.728 9.147 8.566 4.0 4.9 3.1 6.5 7.4 5.6 1.1R1/4″×19 13.157 12.301 11.445 6.0 7.3 4.7 9.7 11.0 8.4 1.7R3/8″×19 16.662 15.806 14.950 6.4 7.7 5.1 10.1 11.4 8.8 1.7R1/2″×14 20.955 19.793 18.631 8.2 10.0 6.4 13.2 15.0 11.4 2.3R3/4″×14 26.441 25.279 24.117 9.5 11.3 7.7 14.5 16.3 12.7 2.3R1″×11 33.249 31.770 30.291 10.4 12.7 8.1 16.8 19.1 14.5 2.9R1.1/4″×11 41.910 40.431 38.952 12.7 15.0 10.4 19.1 21.4 16.8 2.9R1.1/2″×11 47.803 46.324 44.845 12.7 15.0 10.4 19.1 21.4 16.8 2.9R2″×11 59.614 58.135 56.656 15.9 18.2 13.6 23.4 25.7 21.1 2.9R2.1/2”X11 75.184 73.705 72.226 17.5 21.0 14.0 26.7 30.2 23.2 3.5R3”X11 87.884 86.405 84.926 20.6 24.1 17.1 29.8 33.3 26.3 3.5R3.1/2”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 内螺纹公差等级 公差等级2A 2B大径 中径 小径 小径 中径 大径螺纹代号最大 最小 最大 最小 最小 最大 最小 最大JIC 螺纹7/16″×20UNF 11.079 10.874 10.254 10.147 9.568 9.728 10.033 10.287 10.424 11.1131/2″×20UNF 12.667 12.461 11.841 11.732 11.156 11.328 11.608 11.875 12.017 12.79/16″×18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.2883/4″×16UNF 19.012 18.773 17.981 17.854 17.12 17.323 17.678 18.019 18.184 19.057/8″×14UNF 22.184 21.923 21.006 20.869 20.025 20.269 20.676 21.046 21.224 22.2251-1/16″×12UN 26.944 26.655 25.57 25.425 24.425 24.689 25.146 25.613 25.801 26.9881-5/16″×12UN 33.294 33.005 31.92 31.773 30.775 31.039 31.496 31.963 32.154 33.3381-5/8″×12UN 41.229 40.94 39.885 39.705 38.71 38.989 39.446 39.901 40.094 41.2751-7/8″×12UN 47.579 47.29 46.205 46.053 45.06 45.339 45.796 46.251 46.449 47.6252-1/2″×12UN 63.452 63.162 62.078 61.92 60.932 61.214 61.671 62.126 62.332 63.5ORFS 螺纹9/16″×18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.28811/16″×16UN 17.427 17.188 16.396 16.274 15.535 15.748 16.104 16.431 16.589 17.46313/16″×16UN 20.599 20.361 19.568 19.444 18.707 18.923 19.279 19.606 19.766 20.6381″×14UNF 25.357 25.095 24.178 24.036 23.195 23.444 23.825 24.221 24.407 25.41-3/16″×12UN 30.119 29.83 28.745 28.598 27.6 27.864 28.321 28.788 28.979 30.1631-7/16″×12UN 36.467 36.177 35.093 34.943 33.947 34.214 34.671 35.138 35.331 36.5131-11/16″×12UN 42.817 42.527 41.443 41.29 40.297 40.564 41.021 41.488 41.686 42.8632″×12UN 50.754 50.465 49.38 49.225 48.235 48.514 48.971 49.426 49.627 50.8SAE 螺纹5/8″×18UNF 15.839 15.618 14.923 14.803 14.161 14.351 14.681 14.958 15.11 15.8751-1/16″×14UN 26.947 26.683 25.743 25.608 24.74 24.968 25.375 25.783 25.961 26.987其它美制螺纹9/16″×16UN 14.252 14.013 13.221 13.101 12.36 12.573 12.929 13.256 13.411 14.2887/8″×12UN 22.182 21.892 20.808 20.668 19.662 19.939 20.396 20.851 21.034 22.2252-1/4″×12UN 57.104 56.815 55.73 55.575 54.585 54.864 55.321 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基面上的直径 螺纹长度螺纹代号大径 中径 小径 有效长度 管端至基面长Z1/8″×27 10.272 9.519 8.766 7 4.572Z1/4″×18 13.572 12.443 11.314 9.5 5.080Z3/8″×18 17.055 15.926 14.797 10.5 6.096Z1/2″×14 21.223 19.772 18.321 13.5 8.028Z3/4″×14 26.568 25.117 23.666 14 8.611Z1″×11.5 33.228 31.461 29.694 17.5 10.160Z1.1/4″×11.5 41.985 40.218 38.451 18 10.688Z1.1/2″×11.5 48.054 46.287 44.520 18.5 10.688Z2″×11.5 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基本直径 内 螺 纹 外螺纹公 差 等 级 公差等级6H 7H 6g螺纹代号 大 径 中 径 小 径中径公差 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 +0.1500 +0.2360 +0.1900 +0.3000 -0.026-0.138 -0.026-0.206M12X1 12 11.350 10.917 +0.1600 +0.2360 +0.2000 +0.3000 -0.026-0.144 -0.026-0.206M14X1 14 13.350 12.917 +0.1600 +0.2360 +0.2000 +0.3000 -0.026-0.144 -0.026-0.206M12X1.25 12 11.188 10.647 +0.1800 +0.2650 +0.2240 +0.3350 -0.028-0.160 -0.028-0.240M14X1.25 14 13.188 12.647 +0.1800 +0.2650 +0.2240 +0.3350 -0.028-0.160 -0.028-0.240M12X1.5 12 11.026 10.376 +0.1900 +0.3000 +0.2360 +0.3750 -0.032-0.172 -0.032-0.268M14X1.5 14 13.026 12.376 +0.1900 +0.3000 +0.2360 +0.3750 -0.032-0.172 -0.032-0.268M16X1.5 16 15.026 14.376 +0.1900 +0.3000 +0.23。