螺栓孔径及沉头孔径的尺寸图标
| 螺纹公称直径 | 螺栓孔径dh | 倒角e | 沉头孔径D′ | |||
| 1级 | 2级 | 3级 | 4级* | |||
| 2 | 2.2 | 2.4 | 2.6 | - | 0.3 | 7 |
| 3 | 3.2 | 3.4 | 3.6 | - | 0.3 | 9 |
| 4 | 4.3 | 4.5 | 4.8 | (5.5) | 0.4 | 11 |
| 5 | 5.3 | 5.5 | 5.8 | (6.5) | 0.4 | 13 |
| 6 | 6.4 | 6.6 | 7 | (7.8) | 0.4 | 15 |
| 8 | 8.4 | 9 | 10 | (10) | 0.6 | 20 |
| 10 | 10.5 | 11 | 12 | (13) | 0.6 | 24 |
| 12 | 13 | 13.5 | 14.5 | (15) | 1.1 | 28 |
| 14 | 15 | 15.5 | 16.5 | (17) | 1.1 | 32 |
| 16 | 17 | 17.5 | 18.5 | (20) | 1.1 | 35 |
| 18 | 19 | 20 | 21 | (22) | 1.1 | 39 |
| 20 | 21 | 22 | 24 | (25) | 1.2 | 43 |
| 22 | 23 | 24 | 26 | (27) | 1.2 | 46 |
| 24 | 25 | 26 | 28 | (29) | 1.2 | 50 |
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