1.1 普通螺纹（GB/T 196—2003)
普通螺纹GB 196—2003
普通螺纹见表1.1-1。
表1.1-1普通螺纹 （mm)
 |
D1 = D-2* 5/8H
D2 = D-2*3/8H d1 = d-2*5/8H d2 = d – 2*3/8H H = √3/2P = 0.866 025 404P |
参数表：
| 公称直径 (大径） D, d | 螺距P | 中径 D2或d2 | 小径 D1或 d1 |
| 1 | 0.25 | 0.838 | 0.729 |
| 1.2 | 0.25 | 1.038 | 0.929 |
| 1.4 | 0.3 | 1.205 | 1.075 |
| 1.6 | 0.35 | 1.373 | 1.221 |
| 2 | 0.4 | 1.74 | 1.567 |
| 2.5 | 0.45 | 2.208 | 2.013 |
| 3 | 0.5 | 2.675 | 2.459 |
| 3.5 | 0.6 | 3.11 | 2.85 |
| 4 | 0.7 | 3.545 | 3.242 |
| 4.5 | 0.75 | 4.013 | 3.688 |
| 5 | 0.8 | 4.48 | 4.134 |
| 6 | 1 | 5.35 | 4.917 |
| 8 | 1 | 7.35 | 6.917 |
| 1.25 | 7.188 | 6.647 | |
| 10 | 1 | 9.35 | 8.917 |
| 1.25 | 9.188 | 8.647 | |
| 1.5 | 9.026 | 8.376 | |
| 12 | 1.25 | 11.188 | 10.647 |
| 1.5 | 11.026 | 10.376 | |
| 1.75 | 10.836 | 10.106 | |
| 14 | 1.5 | 13.026 | 12.376 |
| 2 | 12.701 | 11.835 | |
| 16 | 1.5 | 15.026 | 14.376 |
| 2 | 14.701 | 13.853 | |
| 18 | 2.5 | 16.376 | 15.294 |
| 20 | 1.5 | 19.026 | 18.376 |
| 2 | 18.701 | 17.835 | |
| 2.5 | 18.376 | 17.294 | |
| 22 | 1.5 | 21.026 | 20.376 |
| 2.5 | 20.376 | 19.294 | |
| 24 | 2 | 22.701 | 21.835 |
| 3 | 22.051 | 20.752 | |
| 27 | 2 | 25.701 | 24.835 |
| 3 | 25.051 | 23.752 | |
| 30 | 2 | 28.701 | 27.385 |
| 3.5 | 27.727 | 26.211 | |
| 33 | 2 | 31.701 | 30.835 |
| 3.5 | 30.727 | 29.211 | |
| 36 | 3 | 34.051 | 32.725 |
| 4 | 33.042 | 31.67 | |
| 39 | 3 | 37.051 | 35.752 |
| 4 | 36.402 | 34.67 | |
| 42 | 3 | 40.051 | 38.752 |
| 4.5 | 39.07 | 37.129 | |
| 45 | 3 | 43.051 | 41.752 |
| 4.5 | 42.077 | 40.129 | |
| 48 | 3 | 46.051 | 44.752 |
| 5 | 44.752 | 42.587 | |
| 52 | 4 | 49.402 | 47.67 |
| 5 | 48.752 | 46.587 | |
| 56 | 4 | 53.402 | 51.67 |
| 5.5 | 52.428 | 50.046 | |
| 60 | 4 | 57.402 | 55.67 |
| 5.5 | 56.428 | 54.046 | |
| 64 | 4 | 61.402 | 59.67 |
| 6 | 60.103 | 57.505 |