英制管螺纹基本尺寸及公差（牙形角55º）
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 | ||||||
G1/8″×28 | 9.728 | 9.147 | 8.566 | +0.170 | +0.282 0 | 0 -0.107 | 0 -0.214 | 0 -0.214 | 0 -0.214 |
G1/4″×19 | 13.157 | 12.301 | 11.445 | +0.125 | +0.445 | -0.125 | -0.250 | -0.250 | 0-0.250 |
G3/8″×19 | 16.662 | 15.806 | 14.950 | +0.125 0 | +0.445 0 | 0 -0.125 | 0 -0.250 | 0 -0.250 | 0 -0.250 |
G1/2″×14 | 20.955 | 19.793 | 18.631 | +0.142 0 | +0.541 0 | 0 -0.142 | 0 -0.284 | 0 -0.284 | 0 -0.284 |
G5/8″×14 | 22.911 | 21.749 | 20.587 | +0.142 0 | +0.541 0 | 0 -0.142 | 0 -0.284 | 0 -0.284 | 0 -0.284 |
G3/4″×14 | 26.441 | 25.279 | 24.117 | +0.142 0 | +0.541 0 | 0 -0.142 | 0 -0.284 | 0 -0.284 | 0 -0.284 |
G1″×11 | 33.249 | 31.770 | 30.291 | +0.180 0 | +0.640 0 | 0 -0.180 | 0 -0.360 | 0 -0.360 | 0 -0.360 |
G1.1/4″×11 | 41.910 | 40.431 | 38.952 | +0.180 0 | +0.640 0 | 0 -0.180 | 0 -0.360 | 0 -0.360 | 0 -0.360 |
G1.1/2″×11 | 47.803 | 46.324 | 44.854 | +0.180 0 | +0.640 0 | 0 -0.180 | 0 -0.360 | 0 -0.360 | 0 -0.360 |
G2″×11 | 59.614 | 58.135 | 56.656 | +0.180 0 | +0.640 0 | 0 -0.180 | 0 -0.360 | 0 -0.360 | 0 -0.360 |
G2.1/2”X11 | 75.184 | 73.705 | 72.226 | +0.217 0 | +0.640 0 | 0 -0.217 | 0 -0.434 | 0 -0.434 | 0 -0.434 |
G3”X11 | 87.884 | 86.405 | 84.926 | +0.217 0 | +0.640 0 | 0 -0.217 | 0 -0.434 | 0 -0.434 | 0 -0.434 |
G3.1/2”X11 | 100.330 | 98.851 | 97.372 | +0.217 0 | +0.640 0 | 0 -0.217 | 0 -0.434 | 0 -0.434 | 0 -0.434 |
美标可调环规、RC/RP直螺纹塞规、锥螺纹塞规
英制锥管螺纹基本尺寸及公差（牙形角55º）
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（±mm） | ||||||
大径 | 中径 | 小径 | 基本 | 最大 | 最小 | 基本 | 最大 | 最小 | ||
R1/8″×28 | 9.728 | 9.147 | 8.566 | 4.0 | 4.9 | 3.1 | 6.5 | 7.4 | 5.6 | 1.1 |
R1/4″×19 | 13.157 | 12.301 | 11.445 | 6.0 | 7.3 | 4.7 | 9.7 | 11.0 | 8.4 | 1.7 |
R3/8″×19 | 16.662 | 15.806 | 14.950 | 6.4 | 7.7 | 5.1 | 10.1 | 11.4 | 8.8 | 1.7 |
R1/2″×14 | 20.955 | 19.793 | 18.631 | 8.2 | 10.0 | 6.4 | 13.2 | 15.0 | 11.4 | 2.3 |
R3/4″×14 | 26.441 | 25.279 | 24.117 | 9.5 | 11.3 | 7.7 | 14.5 | 16.3 | 12.7 | 2.3 |
R1″×11 | 33.249 | 31.770 | 30.291 | 10.4 | 12.7 | 8.1 | 16.8 | 19.1 | 14.5 | 2.9 |
R1.1/4″×11 | 41.910 | 40.431 | 38.952 | 12.7 | 15.0 | 10.4 | 19.1 | 21.4 | 16.8 | 2.9 |
R1.1/2″×11 | 47.803 | 46.324 | 44.845 | 12.7 | 15.0 | 10.4 | 19.1 | 21.4 | 16.8 | 2.9 |
R2″×11 | 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 | 30.2 | 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 |
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