M3.5 × 0.6 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 | M3.5 × 0.6 |
|---|---|
| Thread family | ISO metric coarse |
| Nominal size | M3.5 |
| Basic major diameter | 0.1378″ / 3.5 mm |
| Pitch | 0.6 mm |
| Recommended tap drill | 2.9 mm (0.1142″ / 2.9 mm) |
Tap drill options by thread engagement
Any of these standard drills produces a usable engagement for M3.5 × 0.6; smaller drills give stronger threads but higher tapping torque. Percentages use the conventional approximation (60° thread form).
| Drill | Decimal in | mm | Approx. engagement |
|---|---|---|---|
| #33 | 0.1130 | 2.87 | 80.8% |
| 2.9 mm — chart recommendation | 0.1142 | 2.9 | 77% |
| #32 | 0.1160 | 2.946 | 71% |
| 3 mm | 0.1181 | 3 | 64.1% |
Nearest drills to the tap drill in other systems
| Drill | Size | vs 2.9 mm | Resulting engagement |
|---|---|---|---|
| 7/64″ | 0.1094″ / 2.778 mm | −0.122 mm | 92.6% |
| #33 | 0.1130″ / 2.87 mm | −0.03 mm | 80.8% |
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.
| Fit | Drill / Ø | Decimal in | mm |
|---|---|---|---|
| close | 3.7 mm | 0.1457 | 3.7 |
| normal | 3.9 mm | 0.1535 | 3.9 |
| loose | 4.2 mm | 0.1654 | 4.2 |
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) | 6 mm |
|---|---|
| Head height | 2.4 mm |
| Nut thickness | 2.8 mm |
| Compatible nut | M3.5 × 0.6 hex nut |
Basic (nominal) dimensions. See the wrench & socket size charts for all sizes and the metric ↔ SAE socket comparison.