M6 × 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 | M6 × 1 |
|---|---|
| Thread family | ISO metric coarse |
| Nominal size | M6 |
| Basic major diameter | 0.2362″ / 6 mm |
| Pitch | 1 mm |
| Recommended tap drill | 5 mm (0.1969″ / 5 mm) |
Tap drill options by thread engagement
Any of these standard drills produces a usable engagement for M6 × 1; smaller drills give stronger threads but higher tapping torque. Percentages use the conventional approximation (60° thread form).
| Drill | Decimal in | mm | Approx. engagement |
|---|---|---|---|
| 4.9 mm | 0.1929 | 4.9 | 84.7% |
| #10 | 0.1935 | 4.915 | 83.5% |
| #9 | 0.1960 | 4.978 | 78.6% |
| 5 mm — chart recommendation | 0.1969 | 5 | 77% |
| #8 | 0.1990 | 5.055 | 72.8% |
| 5.1 mm | 0.2008 | 5.1 | 69.3% |
| #7 | 0.2010 | 5.105 | 68.9% |
| 13/64″ | 0.2031 | 5.159 | 64.7% |
| #6 | 0.2040 | 5.182 | 63% |
| 5.2 mm | 0.2047 | 5.2 | 61.6% |
| #5 | 0.2055 | 5.22 | 60.1% |
Nearest drills to the tap drill in other systems
| Drill | Size | vs 5 mm | Resulting engagement |
|---|---|---|---|
| 13/64″ | 0.2031″ / 5.159 mm | +0.159 mm | 64.7% |
| #9 | 0.1960″ / 4.978 mm | −0.022 mm | 78.6% |
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) | 10 mm |
|---|---|
| Head height | 4 mm |
| Nut thickness | 5.2 mm |
| Compatible nut | M6 × 1 hex nut |
Basic (nominal) dimensions. See the wrench & socket size charts for all sizes and the metric ↔ SAE socket comparison.