1-3/4-5 tap drill size
Use a 1-9/16 drill (1.5625 in) for a 1-3/4-5 cutting tap at 75% thread.
| Tap type | Drill | Decimal (in) |
|---|---|---|
| Cutting tap, 75% thread | 1-9/16 | 1.5625 |
| Cutting tap, 50% thread (hard material) | 1-5/8 | 1.6250 |
| Roll / form tap, 65% thread | 1-21/32 | 1.6563 |
- Pitch
- 5.08 mm (5 TPI)
- Major Ø
- 1.7500
- Pitch Ø
- 1.6201
- Minor Ø
- 1.5335
Common questions
- What size drill for a 1-3/4-5 tap?
- Use a 1-9/16 drill (1.5625 in) for a 1-3/4-5 cutting tap at 75% thread.
- What drill for a 1-3/4-5 roll (form) tap?
- About 1.6616 in; the nearest standard drill is 1-21/32. Check your tap maker's table.
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.
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