6-32 tap drill size
Use a #36 drill (0.1065 in) for a 6-32 cutting tap at 75% thread.
| Tap type | Drill | Decimal (in) |
|---|---|---|
| Cutting tap, 75% thread | #36 | 0.1065 |
| Cutting tap, 50% thread (hard material) | #32 | 0.1160 |
| Roll / form tap, 65% thread | 1/8 | 0.1250 |
| Helicoil / STI insert (#6-32×1D) | #25 | 0.1495 |
- Pitch
- 0.7938 mm (32 TPI)
- Major Ø
- 0.1380
- Pitch Ø
- 0.1177
- Minor Ø
- 0.0997
Common questions
- What size drill for a 6-32 tap?
- Use a #36 drill (0.1065 in) for a 6-32 cutting tap at 75% thread.
- What drill for a 6-32 roll (form) tap?
- About 0.1242 in; the nearest standard drill is 1/8. Check your tap maker's table.
- What drill for a 6-32 Helicoil?
- Drill #25 (0.1495 in), then tap with the 6-32 STI tap.
Other UNC sizes
Drill sizes from Machinery's Handbook and ASME B1.1/B1.13M; roll tap sizes from the form-tap formula. Tap and insert makers' tables are authoritative.