For Socket Head Cap Screws
| Counterbore Size | Clearance drill size |
| M1,6 | 1.95mm (0.077) |
| M2 | 2.40mm (0.094) |
| M2,5 | 3.00mm (0.118) |
| M3 | 3.70mm (0.146) |
| M4 | 4.80mm (0.189) |
| M5 | 5.80mm (0.228) |
| M6 | 6.80mm (0.268) |
| M8 | 8.80mm (0.346) |
| M10 | 10.80mm (0.425) |
| M12 | 13.00mm (0.512) |
| M14 | 15.00mm (0.590) |
| M16 | 17.00mm (0.669) |
| M20 | 21.00mm (0.827) |
| M24 | 25.00mm (0.984) |
| M30 | 31.50mm (1.240) |
| M36 | 37.50mm (1.476) |
| M42 | 44.00mm (1.732) |
| M48 | 50.00mm (1.969) |