M14 thread: tap drill, clearance hole and counterbore sizes
The hole sizes and depths for an M14 coarse thread, and how to put it on a drawing.
| Property | Value |
|---|---|
| Nominal diameter | 14 mm |
| Pitch (coarse) | 2 mm |
| Tap drill | Ø12 mm |
| Clearance hole, fine | Ø15 mm |
| Clearance hole, medium | Ø15.5 mm |
| Clearance hole, coarse | Ø16.5 mm |
| Socket head cap screw head Ø (ISO 4762) | 21 mm |
| Counterbore Ø (DIN 974-1) | 24 mm |
| Counterbore depth (head flush) | about 14.5 mm |
Thread depth
| Material | Full thread engagement |
|---|---|
| Steel, stainless steel | 14–21 mm |
| Aluminium, brass | 21–28 mm |
| Plastics | 28–35 mm or an insert |
Drill the tap hole at least 6–8 mm (3–4 pitches) deeper than the full thread, plus the drill point. More on this in how deep a tapped thread should be.
How to call it out on a drawing
Tapped blind hole: M14x2-6H, thread 21 deep, tap drill Ø12 29 deep.
Clearance hole with counterbore: Ø15.5 through, counterbore Ø24 × 14.5 deep.
M12 | M16 | All thread sizes
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