M10 × 1 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 |
|---|---|
| Thread family | ISO metric fine |
| Nominal size | M10 |
| Basic major diameter | 0.3937″ / 10 mm |
| Pitch | 1 mm |
| Recommended tap drill | 9 mm (0.3543″ / 9 mm) |
Tap drill options by thread engagement
Any of these standard drills produces a usable engagement for M10 × 1; smaller drills give stronger threads but higher tapping torque. Percentages use the conventional approximation (60° thread form).
| Drill | Decimal in | mm | Approx. engagement |
|---|---|---|---|
| 8.9 mm | 0.3504 | 8.9 | 84.7% |
| 9 mm — chart recommendation | 0.3543 | 9 | 77% |
| T | 0.3580 | 9.093 | 69.8% |
| 9.1 mm | 0.3583 | 9.1 | 69.3% |
| 23/64″ | 0.3594 | 9.128 | 67.1% |
| 9.2 mm | 0.3622 | 9.2 | 61.6% |
Nearest drills to the tap drill in other systems
| Drill | Size | vs 9 mm | Resulting engagement |
|---|---|---|---|
| 23/64″ | 0.3594″ / 9.128 mm | +0.128 mm | 67.1% |
| T | 0.3580″ / 9.093 mm | +0.093 mm | 69.8% |
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 hex nut |
Basic (nominal) dimensions. See the wrench & socket size charts for all sizes and the metric ↔ SAE socket comparison.
Related threads
- M10 × 1.5 — same nominal size, 1.5 mm pitch (ISO metric coarse) · compare
- M10 × 1.25 — same nominal size, 1.25 mm pitch (ISO metric fine) · compare
- M8 × 1 — next size down in metric-fine
- M10 × 1.25 — next size up in metric-fine