从下向上看，大口变小口
| 名称 | 上磨口 | 下磨口 |
| A型接头 | 10/30 | 14/20 |
| 10/30 | 19/22 | |
| 10/30 | 24/40 | |
| 14/20 | 19/22 | |
| 14/20 | 24/40 | |
| 19/22 | 24/40 | |
| 19/22 | 29/42 | |
| 24/40 | 29/42 | |
| 24/40 | 34/45 | |
| 24/40 | 45/50 | |
| 29/42 | 45/50 | |
| 24/40 | 55/50 | |
| 29/42 | 55/50 |
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