3.2普通螺纹收尾、肩距、退刀槽和倒角（GB/T 3—1997)
普通螺纹收尾、肩距、退刀槽和倒角GB3—1997
普通螺纹收尾、肩距、退刀槽见表1.1-15〜表1.1-16。
表1.1-15外螺纹的收尾、肩距和退刀槽（mm)
| 螺距p | 收尾x max | 肩距a max | 退刀槽 | ||||||
| 一般 | 短的 | –般 | 长的 | 短的 | g1 | g2 | dg | r ≈ | |
| min | max | ||||||||
| 0.25 | 0.6 | 0.3 | 0.75 | 1 | 0.5 | 0.4 | 0.75 | d-0.4 | 0.12 |
| 0.3 | 0.75 | 0.4 | 0.9 | 1.2 | 0.6 | 0.5 | 0.9 | d-0.5 | 0.16 |
| 0.35 | 0.9 | 0.45 | 1.05 | 1.4 | 0.7 | 0.6 | 1.05 | d-0.6 | 0.16 |
| 0.4 | 1 | 0.5 | 1.2 | 1.6 | 0.8 | 0.6 | 1.2 | d-0.7 | 0.2 |
| 0.45 | 1.1 | 0.6 | 1.35 | 1.8 | 0.9 | 0.7 | 1.35 | d-0.7 | 0.2 |
| 0.5 | 1.25 | 0.7 | 1.5 | 2 | 1 | 0.8 | 1.5 | d-0.8 | 0.2 |
| 0.6 | 1.5 | 0.75 | 1.8 | 2.4 | 1.2 | 0.9 | 1.8 | d-1 | 0.4 |
| 0.7 | 1.75 | 0.9 | 2.1 | 2.8 | 1.4 | 1.1 | 2.1 | d-1.1 | 0.4 |
| 0.75 | 1.9 | 1 | 2.25 | 3 | 1.5 | 1.2 | 2.25 | d-1.2 | 0.4 |
| 0.8 | 2 | 1 | 2.4 | 3.2 | 1.6 | 1.3 | 2.4 | d-1.3 | 0.4 |
| 1 | 2.5 | 1.25 | 3 | 4 | 2 | 1.6 | 3 | d-1.6 | 0.6 |
| 1.25 | 3.2 | 1.6 | 4 | 5 | 2.5 | 2 | 3.75 | d-2 | 0.6 |
| 1.5 | 3.8 | 1.9 | 4.5 | 6 | 3 | 2.5 | 4.5 | d-2.3 | 0.8 |
| 1.75 | 4.3 | 2.2 | 5.3 | 7 | 3.5 | 3 | 5.25 | d-2.6 | 1 |
| 2 | 5 | 2.5 | 6 | 8 | 4 | 3.4 | 6 | d-3 | 1 |
| 2.5 | 6.3 | 3.2 | 7.5 | 10 | 5 | 4.4 | 7.5 | d-3.6 | 1.2 |
| 3 | 7.5 | 3.8 | 9 | 12 | 6 | 5.2 | 9 | d-4.4 | 1.6 |
| 3.5 | 9 | 4.5 | 10.5 | 14 | 7 | 6.2 | 10.5 | d-5 | 1.6 |
| 4 | 10 | 5 | 12 | 16 | 8 | 7 | 12 | d-5.7 | 2 |
| 4.5 | 11 | 5.5 | 13.5 | 18 | 9 | 8 | 13.5 | d-6.4 | 2.5 |
| 5 | 12.5 | 6.3 | 15 | 20 | 10 | 9 | 15 | d-7 | 2.5 |
| 5.5 | 14 | 7 | 16.5 | 22 | 11 | 11 | 17.5 | d-7.7 | 3.2 |
| 6 | 15 | 7.5 | 18 | 24 | 12 | 11 | 18 | d-8.3 | 3.2 |
| 参考值 | ≈2.5P | ≈1.25P | ≈3P | =4P | =2P | — | ≈3P | — | — |
注：1.应优先选用“一般”长度的收尾和肩距；“短”收尾和“短”肩距仅用于结构受限制的螺纹件上；产品等级为B或C级的螺纹紧固件可采用“长”肩距。
2.d为螺纹公称直径代号。
3.dg公差为：hl3(d＞3mm)；hl2(d≤3nun)。
表1.1-16内螺纹的收尾、肩距和退刀槽（mm)
| 螺距 | 收尾X | 肩距A | 退刀槽 | |||||
| P | max | max | G1 | Dg | R ≈ | |||
| 一般 | 短的 | 一般 | 长的 | 一般 | 短的 | |||
| 0.25 | 1 | 0.5 | 1.5 | 2 | D + 0.3 | |||
| 0.3 | 1.2 | 0.6 | 1.8 | 2.4 | ||||
| 0.35 | 1.4 | 0.7 | 2.2 | 2.8 | ||||
| 0.4 | 1.6 | 0.8 | 2.5 | 3.2 | ||||
| 0.45 | 1.8 | 0.9 | 2.8 | 3.6 | ||||
| 0.5 | 2 | 1 | 3 | 4 | 2 | 1 | 0.2 | |
| 0.6 | 2.4 | 1.2 | 3.2 | 4.8 | 2.4 | 1.2 | 0.3 | |
| 0.7 | 2.8 | 1.4 | 3.5 | 5.6 | 2.8 | 1.4 | 0.4 | |
| 0.75 | 3 | 1.5 | 3.8 | 6 | 3 | 1.5 | 0.4 | |
| 0.8 | 3.2 | 1.6 | 4 | 6.4 | 3.2 | 1.6 | 0.4 | |
| 1 | 4 | 2 | 5 | 8 | 4 | 2 | D + 0.5 | 0.5 |
| 1.25 | 5 | 2.5 | 6 | 10 | 5 | 2.5 | 0.6 | |
| 1.5 | 6 | 3 | 7 | 12 | 6 | 3 | D + 0.5 | 0.8 |
| 1.75 | 7 | 3.5 | 9 | 14 | 7 | 3.5 | 0.9 | |
| 2 | 8 | 4 | 10 | 16 | 8 | 4 | 1 | |
| 2.5 | 10 | 5 | 12 | 18 | 10 | 5 | 1.2 | |
| 3 | 12 | 6 | 14 | 22 | 12 | 6 | 1.5 | |
| 3.5 | 14 | 7 | 16 | 24 | 14 | 7 | 1.8 | |
| 4 | 16 | 8 | 18 | 26 | 16 | 8 | 2 | |
| 4.5 | 18 | 9 | 21 | 29 | 18 | 9 | 2.2 | |
| 5 | 20 | 10 | 23 | 32 | 20 | 10 | 2.5 | |
| 5.5 | 22 | 11 | 25 | 35 | 22 | 11 | 2.8 | |
| 6 | 24 | 12 | 28 | 38 | 24 | 12 | 3 | |
| 参考值 | =4P | =2P | ≈(6-5)P | ≈(8-6.5)P | =4P | =2P | — | ≈0.5P |
注：1.应优先选用“一般”长度的收尾和肩距；容屑需要较大空间时可选用“长”肩距，结构限制时可选用“短”收尾。
2. “短”退刀槽仅在结构受限制时采用。
3. Ds公差为H13。
4. D为螺纹公称直径代号。