| 尺寸代号 | 每25.4(mm)内的牙数n | 螺距p | 牙高h | 圆弧半径r | 基面上的直径\大径d=D | 基面上的直径\中径d2=D2 | 基面上的直径\小径d1=D1 |
| 1/16 | 28 | 0.907 | 0.581 | 0.125 | 7.723 | 7.142 | 6.561 |
| 1/8 | 28 | 0.907 | 0.581 | 0.125 | 9.728 | 9.147 | 8.566 |
| 1/4 | 19 | 1.337 | 0.856 | 0.184 | 13.157 | 12.301 | 11.445 |
| 3/8 | 19 | 1.337 | 0.856 | 0.184 | 16.662 | 15.806 | 14.95 |
| 1/2 | 14 | 1.814 | 1.162 | 0.249 | 20.955 | 19.793 | 18.631 |
| 5/8 | 14 | 1.814 | 1.162 | 0.249 | 22.911 | 21.749 | 20.587 |
| 3/4 | 14 | 1.814 | 1.162 | 0.249 | 26.441 | 25.279 | 24.117 |
| 7/8 | 14 | 1.814 | 1.162 | 0.249 | 30.201 | 29.039 | 27.877 |
| 1 | 11 | 2.309 | 1.479 | 0.317 | 33.249 | 31.77 | 30.291 |
| 1+1/3 | 11 | 2.309 | 1.479 | 0.317 | 37.897 | 36.418 | 34.939 |
| 1+1/4 | 11 | 2.309 | 1.479 | 0.317 | 41.91 | 40.431 | 38.952 |
| 1+1/2 | 11 | 2.309 | 1.479 | 0.317 | 47.803 | 46.324 | 44.845 |
| 1+3/4 | 11 | 2.309 | 1.479 | 0.317 | 53.746 | 52.267 | 50.788 |
| 2 | 11 | 2.309 | 1.479 | 0.317 | 59.614 | 58.135 | 56.656 |
| 2+1/4 | 11 | 2.309 | 1.479 | 0.317 | 65.71 | 64.231 | 62.752 |
| 2+1/2 | 11 | 2.309 | 1.479 | 0.317 | 75.184 | 73.705 | 72.226 |
| 2+3/4 | 11 | 2.309 | 1.479 | 0.317 | 81.534 | 80.055 | 78.576 |
| 3 | 11 | 2.309 | 1.479 | 0.317 | 87.884 | 86.405 | 84.926 |
| 3+1/2 | 11 | 2.309 | 1.479 | 0.317 | 100.33 | 98.851 | 97.372 |
| 4 | 11 | 2.309 | 1.479 | 0.317 | 113.03 | 111.551 | 110.072 |
| 5 | 11 | 2.309 | 1.479 | 0.317 | 138.43 | 136.951 | 135.472 |
| 5+1/2 | 11 | 2.309 | 1.479 | 0.317 | 151.13 | 149.651 | 148.172 |
| 6 | 11 | 2.309 | 1.479 | 0.317 | 163.83 | 162.351 | 160.872 |
1.对薄壁管件、中径公差适用于平均中径，该中径是测量两个相垂直直径的算术平均值。
2.本标准适用于管接头、旋塞、阀门及其附件。
3.标记示例：
螺纹特征代号用G表示
1 1/2左旋内螺纹： G1 1/2-LH（右旋不标）；
1 1/2A级外螺纹：G1 1/2A
1 1/2B级外螺纹：G1 1/2B
A级螺纹副：G1 1/2 / G1 1/2A
4.在示图
