公制螺纹 基本直径 大径 中径 小径 6H 中径公 差M10*1 M12*1 M14*1 M12*1.25 M14*1.25 M12*1.5 M14*1.5 M16*1.5 M18*1.5 M20*1.5 M22*1.5 M24*1.5 M26*1.5 M27*1.5 M30*1.5 M33*1.5 M36&1.5 M39*1.5 M42*1.5 M27*2 M30*2 M33*2 M36*2 M39*2 M42*2 M45*2 M52*2 M60*2 M64*2 M72*2 10 12 14 12 14 12 14 16 18 20 22 14 26 27 30 33 36 39 42 27 30 33 36 39 42 45 52 60 64 72 9.35 11.35 13.35 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 10.917 122.917 10.647 12.647 10.376 12.376 14.376 16.376 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 0,+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 小径公 差0,+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 内螺纹公差等级 7H 中径公 0,差0,+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 小径公差 0,+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 6G 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 小径公差 -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 外螺纹公差 美制 NPSM 螺纹 (美国标准 ANSI B1.20.1 机械连接用直管螺纹 60 度) 标号 螺纹代号 最大值 02 04 1/8-27NPSM 1/4-18NPSM 10.084 13.360 外螺纹(2A 级) 大径 最小值 9.906 13.132 9.462 12.454 中径 最大值 最小值 9.370 12.342 9.093 11.887 最小值 内螺纹(2B 级) 小径 最大值 9.246 12.217 9.489 12.487 中径 最小值 最大值 9.609 12.634 06 08 12 16 20 24 32 40 48 3/8-18NPSM 1/2-14NPSM 3/4-14NPSM 1-11.5NPSM 1.1/4-11.5NPSM 1.1/2-11.5NPSM 2-11.5NPSM 2.1/2-8NPSM 3-8NPSM 16.815 20.904 26.264 32.842 41.605 47.676 59.715 72.161 88.062 16.586 20.650 26.010 32.537 41.300 47.371 59.411 71.780 87.681 15.890 19.733 25.077 31.417 40.173 46.241 58.278 70.104 86.009 15.776 19.604 24.943 31.270 40.020 46.086 58.120 69.916 85.816 15.316 18.974 24.333 30.505 39.268 45.339 57.379 68.783 84.684 15.545 19.279 24.638 30.759 39.497 45.568 57.607 69.266 85.166 15.926 19.771 25.118 31.460 40.218 46.286 58.326 70.160 86.068 16.076 19.942 25.293 31.653 40.416 46.487 58.532 70.409 86.319 NPT 布锥管螺纹 标号 02 04 06 08 12 16 20 24 32 40 48 螺纹代号 大径 Z1/8*27 Z1/4*18 Z3/8*18 Z1/2*14 Z3/4*14 Z1*11.5 Z1.1/4*1.5 Z1.1/2*11.5 Z2*11.5 Z2.1/2*8 Z3*8 10.242 13.616 17.055 21.223 26.568 33.228 41.985 48.054 60.092 72.699 88.608 基面上的直径 中径 9.489 12.487 15.926 19.772 25.117 31.461 40.218 46.287 58.325 70.159 86.068 小径 8.736 11.385 14.797 18.321 23.666 29.694 38.451 44.520 56.558 67.619 83.528 螺纹长度 管端至基面长 4.102 5.786 6.096 8.128 8.611 10.160 10.668 10.668 11.074 17.323 19.456 有效长度 6.703 10.206 10.358 13.556 13.861 17.343 17.953 18.377 19.215 28.892 30.480 9.986 13.254 16.674 20.715 26.030 32.593 41.318 47.387 59.400 71.616 87.392 端面大径 55 度英锥管螺纹 标号 螺纹代号 大径 基本直径 中径 小径 内螺纹 中径公差 小径公差 A 中径公差 02 04 06 08 10 12 16 20 24 32 40 48 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*11 G3*11 9.728 13.157 16.662 20.955 22.911 26.441 33.249 41.910 47.803 59.614 75.184 87.884 9.147 12.301 15.806 19.793 21.749 25.279 31.770 40.431 46.324 58.135 73.705 86.405 8.566 11.445 14.950 18.631 20.587 24.117 30.291 38.952 44.845 56.656 72.226 84.926 0.170,0 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 0.282,0 0.445,0 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,-0.170 0.-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 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 中径公差 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 外螺纹 公差等级 B 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 55 度英锥管螺纹 标号 螺纹