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| unit:mm | ||||||||
| Male tooth system | L | Tapping hole size | Reference laps±1/4 | |||||||
| M | Pitch | 1D | 1.5D | 2D | Applicable drill | Mini | Max. | 1D | 1.5D | 2D |
| M2 | 0.4 | 2 | 3 | 4 | 2.1 | 2.1 | 2.16 | 3-1/4 | 5-5/8 | 8 |
| M2.5 | 0.45 | 2.5 | 3.8 | 5 | 2.6 | 2.6 | 2.65 | 3-1/4 | 6-1/8 | 8-1/2 |
| M3 | 0.5 | 3 | 4.5 | 6 | 3.1 | 3.12 | 3.2 | 4 | 6-5/8 | 9-1/4 |
| M4 | 0.7 | 4 | 6 | 8 | 4.2 | 4.17 | 4.3 | 3-7/8 | 6-3/8 | 8-7/8 |
| M5 | 0.8 | 5 | 7.5 | 10 | 5.2 | 5.16 | 5.33 | 4-3/8 | 7-1/8 | 9-7/8 |
| M6 | 1 | 6 | 9 | 12 | 6.3 | 6.25 | 6.42 | 4-1/4 | 7-1/8 | 10 |
| M8 | 1.25 | 8 | 12 | 16 | 8.4 | 8.31 | 8.52 | 4-5/8 | 7-3/8 | 10-1/4 |
| M10 | 1.5 | 10 | 15 | 20 | 10.5 | 10.37 | 10.62 | 5 | 8 | 11 |
| M12 | 1.75 | 12 | 18 | 24 | 12.5 | 12.43 | 12.73 | 5 | 8-1/4 | 11-3/8 |
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