7/16-14 Tap Drill Size and What Drill Bit
Use a U drill bit
7/16-14 · 0.368 in / 9.35 mm · ~75% thread
7/16-14 is a UNC coarse thread used in mechanical and structural assemblies. A letter U bit gives the correct tap drill.
At a glance
| Tap drill | U |
|---|---|
| Inches | 0.368 in |
| Millimetres | 9.35 mm |
| Major diameter | 0.4375 in |
| Pitch | 0.0714 in |
| Threads per inch | 14 |
Why this size
drillØ = major − (pitch × %thread) = 0.4375 − (0.0714 × 0.75) = 0.3840 in → next standard drill U (0.368 in / 9.35 mm)
A 7/16-20 fine thread (a 25/64 bit) differs. This reference covers the 7/16-14 coarse thread.
Clearance holes for 7/16-14
A clearance hole lets the bolt pass through unthreaded – close fit keeps parts aligned, free fit allows movement.
| Tap drill (cuts threads) | U |
|---|---|
| Close fit clearance | 29/64 bit |
| Free fit clearance | 31/64 bit |
Related sizes
Compare with adjacent threads – coarse, fine and the opposite measurement system: