7/16 Tap Drill Size and Drill Bit for a 7/16
Use a U drill bit
7/16-14 · 0.3680 in / 9.35 mm · ~75% thread
A 7/16 inch tap is the 7/16-14 coarse UNC thread. A letter U bit is the correct tap drill for a strong thread at 75% engagement.
At a glance
| Tap drill | U |
|---|---|
| Inches | 0.3680 in |
| Millimetres | 9.35 mm |
| Major diameter | 0.4375 in |
| Pitch | 0.0714 in |
| Threads per inch | 14 |
Why this size
7/16-14 tap drill: drillØ = major − (pitch × 0.75) = 0.4375 − (0.0714 × 0.75) = 0.3839 in → nearest standard bit = U (0.3680 in)
The 7/16-20 fine thread uses a 25/64 in bit (0.3906 in) — a bigger hole for the shallower fine thread. This reference covers the standard 7/16-14 coarse thread.
Related sizes
Nearby sizes
Larger coarse UNC threads, and the drills that go with them: