Drill Bits / #36 Diameter
6-32 Tap Drill Size is a #36 Drill Bit
The drill bit size for a 6-32 tap is a #36 drill bit, producing a 0.1065" (2.71mm) hole before tapping.
Preferred Tap Drill Size for 6-32 Threads
For a #6-32 UNC tap, the standard tap drill size is a #36 drill bit which yields a hole size that creates a thread engagement of approximately 77%.
Alternative Drill Bit Size for 6-32 Tap
| Drill Size | Decimal Size |
Thread Engagement |
Rank |
| 2.75mm | 0.1080" | 73% | Good |
| 7/64" | 0.1094" | 70% | Good |
| #35 | 0.1100" | 69% | OK-Low |
There are two alternative drill sizes for a 6-32 tap drill that are in the good / preferred 70-77% thread engagement range. They are shown in the chart above. Some references recommend a #35 drill size, but this size only creates a thread engagement of 69%. This is an acceptable thread depth for many applications and is not far outside the preferred range.
Compare Additional Tap Drill Sizes
Use this tap drill calculator to compare additional drill sizes and understand the relationship of thread percentages to the drill and tap size.
Why Drill Size Accuracy Matters
In CNC machining, fixture building, and repair operations, using the correct 6-32 drill and tap size helps maintain consistent thread quality across parts. It also improves tool life and supports reliable fastener fit in production environments.
See A Complete Tap Drill Chart
Use these additional chart references for UNC, UNF, metric, and pipe tap drill recommendations.
- Drill Size For Screw Chart
- Drill And Tap Chart Metric
- Drill And Tap Chart Standard
- Drill And Tap Chart NPT
