To tap an M12 thread (pitch 1.75 mm), drill a 10.2 mm hole for standard 6H tolerance. Use 10.5 mm for a looser 7H fit. M12 taps are common in heavy machinery, flanges and suspension components.
| Tolerance class | Drill diameter | Pitch | Thread depth |
|---|---|---|---|
| 6H (standard) | 10.2 mm | 1.75 mm | 15–18 mm |
| 7H (loose) | 10.5 mm | 1.75 mm | 15–18 mm |
| 4H (tight) | 10.0 mm | 1.75 mm | 15–18 mm |
Fine pitch M12×1.25 and 1.5 variant available in Handbook Locksmith app.
FAQ
Use a 10.2 mm drill for standard M12 thread (6H tolerance, 1.75 mm pitch).
Full M12 thread data in the app
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← Metric threads | See also: M3 · M4 · M5 · M6 · M8 · M10 · M16 · M20 · Spindle speed calculator