Fasteners & Drilling
Metric Clearance Hole Chart
Recommended clearance hole diameters for common metric bolts, for close-fit and free-fit assemblies.
| Bolt Size | Close Fit | Free Fit |
|---|---|---|
| M3 | 3.2 | 3.4 |
| M4 | 4.3 | 4.5 |
| M5 | 5.3 | 5.5 |
| M6 | 6.4 | 6.6 |
| M8 | 8.4 | 9.0 |
| M10 | 10.5 | 11.0 |
| M12 | 13.0 | 13.5 |
Reference values only. Verify against the current governing standard (e.g. ISO, ANSI, ASME, DIN) before using in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.
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