M10 × 1.5 Thread
The chart recommendation gives approximately 77% thread engagement — the conventional target for average materials. It is not the only valid choice; see the options below.
Specification
| Designation | M10 × 1.5 |
|---|---|
| Thread family | ISO metric coarse |
| Nominal size | M10 |
| Basic major diameter | 0.3937″ / 10 mm |
| Pitch | 1.5 mm |
| Recommended tap drill | 8.5 mm (0.3346″ / 8.5 mm) |
Tap drill options by thread engagement
Any of these standard drills produces a usable engagement for M10 × 1.5; smaller drills give stronger threads but higher tapping torque. Percentages use the conventional approximation (60° thread form).
| Drill | Decimal in | mm | Approx. engagement |
|---|---|---|---|
| 8.4 mm | 0.3307 | 8.4 | 82.1% |
| Q | 0.3320 | 8.433 | 80.4% |
| 8.5 mm — chart recommendation | 0.3346 | 8.5 | 77% |
| 8.6 mm | 0.3386 | 8.6 | 71.8% |
| R | 0.3390 | 8.611 | 71.3% |
| 8.7 mm | 0.3425 | 8.7 | 66.7% |
| 11/32″ | 0.3438 | 8.731 | 65.1% |
| 8.8 mm | 0.3465 | 8.8 | 61.6% |
Nearest drills to the tap drill in other systems
| Drill | Size | vs 8.5 mm | Resulting engagement |
|---|---|---|---|
| 21/64″ | 0.3281″ / 8.334 mm | −0.166 mm | 85.5% |
| Q | 0.3320″ / 8.433 mm | −0.067 mm | 80.4% |
Clearance holes
For a bolt or screw of this size to pass through freely. ISO 273 series (fine/medium/coarse), shown as close, normal, and loose.
Hex bolt & nut dimensions
For a standard hex bolt (ISO 4014/4017) and style-1 nut (ISO 4032) in this size.
| Wrench / socket size (bolt head) | 16 mm — legacy DIN: 17 mm |
|---|---|
| Head height | 6.4 mm |
| Nut thickness | 8.4 mm |
| Compatible nut | M10 × 1.5 hex nut |
Basic (nominal) dimensions. See the wrench & socket size charts for all sizes and the metric ↔ SAE socket comparison.
Related threads
- M10 × 1 — same nominal size, 1 mm pitch (ISO metric fine) · compare
- M10 × 1.25 — same nominal size, 1.25 mm pitch (ISO metric fine) · compare
- M8 × 1.25 — next size down in metric-coarse
- M12 × 1.75 — next size up in metric-coarse