螺纹中径对照表

螺纹中径对照表

公制螺纹

基本直径 小径 6H 差 8.917 内螺纹公差等级 7H 差 0,差 差 6G 外螺纹大中径 径 中径公小径公中径公小径公中径公差 0 9.35 0,+0.150 0,+0.236 0,+0.190 0,+0.300 -0.026,-0.138 2 11.35 10.917 0,+0.160 0,+0.236 0,+0.200 0,+0.300 -0.026,-0.144 4 13.35 122.917 0,+0.160 0,+0.236 0,+0.200 0,+0.300 -0.026,-0.144 2 11.188 10.647 0,+0.180 0,+0.265 0,+0.224 0,+0.335 -0.028,-0.160 4 13.188 12.647 0,+0.180 0,+0.265 0,+0.224 0,+0.335 -0.028,-0.160 2 11.026 10.376 0,+0.190 0,+0.300 0,+0.236 0,+0.375 -0.032,-0.172 4 13.026 12.376 0,+0.190 0,+0.300 0,+0.236 0,+0.375 -0.032,-0.172 6 15.026 14.376 0,+0.190 0,+0.300 0,+0.236 0,+0.375 -0.032,-0.172 8 17.026 16.376 0,+0.190 0,+0.300 0,+0.236 0,+0.375 -0.032,-0.172 0 19.026 18.376 0,+0.190 0,+0.300 0,+0.236 0,+0.375 -0.032,-0.172 2 21.026 20.376 0,+0.190 0,+0.300 0,+0.236 0,+0.375 -0.032,-0.172 4 23.026 22.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182 6 25.026 24.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182 7 26.026 25.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182 0 29.026 28.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182 3 32.026 31.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182 6 35.026 34.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182

9 38.026 37.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182 2 41.026 40.376 0,+0.200 0,+0.300 0,+0.250 0,+0.375 -0.032,-0.182 7 25.701 24.835 0,+0.224 0,+0.375 0,+0.280 0,+0.475 -0.038,-0.208 0 28.701 27.835 0,+0.224 0,+0.375 0,+0.280 0,+0.475 -0.038,-0.208 3 31.701 30.835 0,+0.224 0,+0.375 0,+0.280 0,+0.475 -0.038,-0.208 6 34.701 33.835 0,+0.224 0,+0.375 0,+0.280 0,+0.475 -0.038,-0.208 9 37.701 36.835 0,+0.224 0,+0.375 0,+0.280 0,+0.475 -0.038,-0.208 2 40.701 39.835 0,+0.224 0,+0.375 0,+0.280 0,+0.475 -0.038,-0.208 5 43.701 42.835 0,+0.224 0,+0.375 0,+0.280 0,+0.475 -0.038,-0.208 2 50.701 49.835 0,+0.236 0,+0.375 0,+0.300 0,+0.475 -0.038,-0.218 0 58.701 57.835 0,+0.236 0,+0.375 0,+0.300 0,+0.475 -0.038,-0.218 4 62.701 61.835 0,+0.236 0,+0.375 0,+0.300 0,+0.475 -0.038,-0.218 美制NPSM螺纹（美国标准ANSI B1.20.1机械连接用直管螺纹60

度）

2 70.701 69.835 0,+0.236 0,+0.375 0,+0.300 0,+0.475 -0.038,-0.218 螺纹代号 最大值 外螺纹（2A级） 大径 最小值 中径 最大值 最小值 最小值 内螺纹（2B级） 小径 最大值 最小值 中径1/8-27NPSM 10.084 9.906 9.462 9.370 9.093 9.246 9.489 9 1/4-18NPSM 13.360 13.132 12.454 12.342 11.887 12.217 12.487 13/8-18NPSM 16.586 15.890 15.776 15.316 15.545 15.926 1

16.815 1/2-14NPSM 20.904 20.650 19.733 19.604 18.974 19.279 19.771 13/4-14NPSM 26.264 26.010 25.077 24.943 24.333 24.638 25.118 21-11.5NPSM 32.842 32.537 31.417 31.270 30.505 30.759 31.460 31/4-11.5NPSM 41.605 41.300 40.173 40.020 39.268 39.497 40.218 41/2-11.5NPSM 47.676 47.371 46.241 46.086 45.339 45.568 46.286 42-11.5NPSM 3-8NPSM 59.715 59.411 58.278 58.120 57.379 57.607 58.326 52.1/2-8NPSM 72.161 71.780 70.104 69.916 68.783 69.266 70.160 7NPT布锥管螺纹

88.062 87.681 86.009 85.816 84.684 85.166 86.068 8螺纹长度 管端至基面长 有效长度 端面大径 标螺纹代号 基面上的直径 号 大径 中径 小径 02 04 06 08 12 16 Z1/8*27 Z1/4*18 Z3/8*18 Z1/2*14 Z3/4*14 Z1*11.5 10.242 9.489 8.736 4.102 6.703 9.986 13.616 12.487 11.385 5.786 10.206 13.254 17.055 15.926 14.797 6.096 10.358 16.674 21.223 19.772 18.321 8.128 13.556 20.715 26.568 25.117 23.666 8.611 13.861 26.030 33.228 31.461 29.694 10.160 17.343 32.593 20 Z1.1/4*1.5 41.985 40.218 38.451 10.668 17.953 41.318 24 Z1.1/2*11.5 48.054 46.287 44.520 10.668 18.377 47.387

32 48 Z2*11.5 Z3*8 60.092 58.325 56.558 11.074 19.215 59.400 88.608 86.068 83.528 19.456 30.480 87.392 55度英锥管螺纹

40 Z2.1/2*8 72.699 70.159 67.619 17.323 28.892 71.616 纹代号 大径 基本直径 中径 内螺纹 小径 中径公小径公差 差 差 0，A 外螺纹 公差等级 中径公大径0，中径0，0，0，0，0，0，0，公差 公差 /8*28 9.728 9.147 8.566 0.170，0 0.282，0 -0.170 -0.214 -0.214/4*19 13.157 12.301 11.445 0.125，0 0.445，0 0.-0.125 0，0，0，0，0，0，0，0，0，0，0，-0.250 -0.250/8*19 16.662 15.806 14.950 0.125，0 0.445，0 -0.125 -0.250 -0.250/2*14 20.955 19.793 18.631 0.142，0 0.541，0 -0.142 -0.284 -0.284/8*14 22.911 21.749 20.587 0.142，0 0.541，0 -0.142 -0.284 -0.284/4*14 26.441 25.279 24.117 0.142，0 0.541，0 33.249 31.770 30.291 0.180，0 0.640，0 -0.142 -0.284 -0.2841*11

-0.180 -0.360 -0.3600，0，0，0，0，0，0，0，0，0，0，0，0，0，0，1/4*11 41.910 40.431 38.952 0.180，0 0.640，0 -0.180 -0.360 -0.3601/2*11 47.803 46.324 44.845 0.180，0 0.640，0 59.614 58.135 56.656 0.180，0 0.640，0 -0.180 -0.360 -0.3602*11 -0.180 -0.360 -0.3601/2*11 75.184 73.705 72.226 0.217，0 0.640，0 87.884 86.405 84.926 0.217，0 0.640，0 55度英锥管螺纹

-0.217 -0.434 -0.4343*11 -0.217 -0.434 -0.434标螺纹代号 号 基面上的直径 大径 中径 小径 基准长度 基本 最大 最小 有效螺纹长度基本 最大 最小

02 R1/8*28 9.728 9.147 8.566 4 4.9 3.1 6.5 7.4 5.04 R1/4*19 13.157 12.301 11.445 6 7.3 4.7 9.7 11 8.06 R3/8*19 16.662 15.806 14.950 6.4 7.7 5.1 10.1 11.4 8.08 R1/2*14 20.955 19.793 18.631 8.2 10 6.4 13.2 15 11.16 R1*11 12 R3/4*14 26.441 25.279 24.117 9.5 11.3 7.7 14.5 16.3 1233.249 31.770 30.291 10.4 12.7 8.1 16.8 19.1 1420 R1.1/4*11 41.910 40.431 38.952 12.7 15 10.4 19.1 21.4 1632 48 R2*11 R3*11 24 R1.1/2*11 47.803 46.324 44.845 12.7 15 10.4 19.1 21.4 1640 R2.1/2*11 75.184 73.705 72.226 17.5 21 美制螺纹

59.614 58.135 56.656 15.9 18.2 13.6 23.4 25.7 2114 26.7 30.2 2387.884 86.405 84.926 20.6 24.1 17.1 29.8 33.3 26外螺纹 公差等级2A 大径 最大 最小 中径 最大 最小 小径 最大 标号 螺纹代号 小最小

JIC螺纹 02 03 04 05 06 08 10 12 16 20 24 32 40 3/8*24UNF 5/16×24UNF 7.910 7.727 7.221 7.127 6.650 6.7829.497 9.314 8.809 8.712 8.237 8.3827/16*20UNF 11.079 10.874 10.254 10.147 9.568 9.7281/2*20UNF 12.667 12.461 11.841 11.732 11.156 11.3289/16*18UNF 14.252 14.031 13.335 13.221 12.573 12.7513/4*16UNF 19.012 18.773 17.981 17.854 17.12 17.3237/8*14UNF 22.184 21.923 21.006 20.869 20.025 20.2691.1/16*12UNF 26.944 26.655 25.57 25.425 24.425 24.6891.5/16*12UNF 33.294 33.005 31.92 31.773 30.775 31.0391.5/8*12UNF 41.229 40.94 39.855 39.705 38.71 38.9891.7/8*12UNF 47.579 47.29 46.205 46.053 45.06 45.3393812UNF 2.1/2*12UNF 63.452 63.162 62.078 61.92 60.932 61.21476.157 75.862 74.778 74.618 73.632 73.914ORFS螺纹 18HK 1.1/2*10UNF 38.052 37.724 36.401 36.238 35.029 35.35704 06 08 10 12 9/16*18UNF 14.252 14.031 13.335 13.221 12.573 12.75111/16*16UNF 17.427 17.188 16.396 16.274 15.535 15.7481*14UNSF 13/16*16UNF 20.599 20.361 19.568 19.444 18.707 18.92325.357 25.095 24.178 24.036 23.195 23.4441.3/16*12UN 30.119 29.83 28.754 28.598 27.6 27.864

16 20 24 06 12 1.7/16*12UN 36.467 36.177 35.093 34.943 33.947 34.2142*12UN 1.11/16*12UN 42.817 42.527 41.443 41.29 40.297 40.564SAE螺纹 1.1/16*14UNF 26.947 26.683 25.743 其他美制螺纹 50.754 50.465 49.38 49.25 48.235 48.5145/8×18UNF 15.839 15.618 14.923 14.803 14.161 14.35125.608 24.74 24.968 软管编号 9/16*16UN 14.252 14.013 13.221 13.101 12.36 12.5737/8*12UN 22.182 21.892 20.808 20.668 19.662 19.939可拆式芯子与套筒连接螺纹

2.1/4*12UN 57.104 56.815 55.73 55.575 54.585 54.864螺纹代号 大径 最大 最小 外螺纹 中径 最大 最小 小径 最小 小径最R5-04 9/32*32 7.120 6.967 6.604 6.523 6.175 6.294 6R5-05 46/127*28 9.197 9.032 8.608 8.516 8.115 8.234 8R5-08 9/16*24 R5-06 107/254*28 10.685 10.520 10.095 10.004 9.603 9.735 914.257 14.074 13.569 13.470 12.997 13.132 1R5-10 11/16*24 17.432 17.249 16.744 16.642 16.172 16.307 1R5-12 13/16*20 20.599 20.399 19.779 19.667 19.347 19.253 1

R5-16 1.1/16*18 26.952 26.731 26.035 25.916 25.273 25.451 2R5-20 1.5/16*18 33.299 33.078 32.382 32.258 31.620 31.801 3R5-32 2A-04 2A-06 2A-08 2A-10 2A-12 2*18 7/16*20 9/16*18 5/8*18 3/4*18 7/8*18 R5-24 1.9/16*18 39.649 39.428 38.732 38.605 37.970 38.151 350.762 50.541 49.845 49.715 49.083 49.276 411.079 10.874 10.254 10.147 9.568 9.728 114.252 14.031 13.335 13.221 12.573 12.751 115.839 15.618 14.923 14.803 14.161 14.351 119.014 18.793 18.098 17.981 17.336 17.526 122.189 21.968 21.273 21.156 20.511 20.701 22A-16 1.3/16*16 30.124 29.870 29.093 28.964 28.232 28.448 2新西兰B09内螺纹

2A-20 1.9/16*18 39.649 39.428 38.732 38.605 37.970 38.151 3标号 你螺纹代号 大径MIN 中径MIN 中径MAX 小径MIN 小径MAX B-09 0.860in*14 21.844 20.683 20.841 19.522

NPTF+密封管螺纹

标号 螺纹代号 外螺纹小端中径 外螺纹大端中径 外螺纹小端大径最外螺纹小端大径最外螺纹全牙长度 内螺纹大端中径

小 2 4 6 8 12 16 1/8-27NPTF 1/4-18NPTF 3/8-18NPTF 1/2-14NPTF 3/4-14NPTF 1-11.5NPTF 大 9.233 9.652 9.871 9.960 6.703 9.489 12.126 12.764 13.128 13.215 10.206 12.487 115.545 16.193 16.547 16.634 10.358 15.926 119.264 20.111 20.616 20.703 13.556 19.772 124.579 25.445 25.931 26.018 13.861 25.117 230.826 31.910 32.474 32.562 17.343 31.461 320 1.1/4-11.5NPTF 39.551 40.673 41.199 41.287 17.953 40.218 332 48 2-11.5NPTF 3-8NPTF 24 1.1/2-11.5NPTF 45.621 46.769 47.269 47.357 18.377 46.287 457.633 58.834 59.281 59.369 19.215 58.325 540 2.1/2-8NPTF 69.076 70.882 71.476 71.559 28.893 70.159 6备注：1.表中外螺纹的完整螺纹长度包括不超过一个螺距长度的倒角

2.表中内螺纹的完整螺纹长度不包括在中径线和倒角交线外的锥口孔。即完整螺纹长度的等于完整内螺纹加一个螺距。

84.852 86.757 87.252 87.335 30.480 86.068 8