7/16-14 Tap Drill Size & Thread Specs
Everything for a 7/16-14 UNC thread on one page: tap drill (U), clearance holes, wrench and hex key sizes, and the nearest metric thread.
SP-TD-01 · 7/16-14
7/16-14 specs
SizePlate
7/16-14 UNC · tap with
U drill
.3680″
9.35 mm · 75% thread
- Metric drill
- 9.3 mm · .3661
- Clearance
- 29/64 / 15/32
- Wrench
- 5/8″
- Cap screw key
- 3/8″
Thread
- Nominal size
- 7/16″ · 11.11 mm
- Major diameter
- .4375″
- Threads per inch
- 14
- Pitch
- .0714″ · 1.814 mm
- Series
- UNC (coarse)
- UNF version
- 7/16-20
Drilling
- Tap drill (75%)
- U · .3680
- Metric substitute
- 9.3 mm · .3661
- Tap drill (≈50%)
- 25/64 · .3906
- Close fit
- 29/64 · .4531
- Free fit
- 15/32 · .4688
Tools
- Hex bolt wrench
- 5/8″
- Hex nut wrench
- 11/16″
- Socket head cap key
- 3/8″
- Button head key
- —
- Flat head key
- 1/4″
Nearest metric
- Thread
- M12 × 1.75
- Major diameter
- 12 mm
- Pitch
- 1.75 mm
- Tap drill
- 10.2 mm
- Interchangeable
- No
Not interchangeable means the threads look close but won't run together: forcing one into the other strips both.
Drill size by thread percentage
Larger drill, less thread, easier tapping. 75% is the usual target.
| Drill | Decimal | mm | Thread |
|---|---|---|---|
| 9.1 mm | .3583 | 9.1 | 85% |
| 23/64 | .3594 | 9.13 | 84% |
| 9.2 mm | .3622 | 9.2 | 81% |
| 9.3 mm | .3661 | 9.3 | 77% |
| U | .3680 | 9.35 | 75% |
| 9.4 mm | .3701 | 9.4 | 73% |
| 9.5 mm | .3740 | 9.5 | 68% |
| 3/8 | .3750 | 9.52 | 67% |
| V | .3770 | 9.58 | 65% |
| 9.6 mm | .3780 | 9.6 | 64% |
| 9.7 mm | .3819 | 9.7 | 60% |
| 9.8 mm | .3858 | 9.8 | 56% |
| W | .3860 | 9.8 | 56% |
| 9.9 mm | .3898 | 9.9 | 51% |
| 25/64 | .3906 | 9.92 | 51% |
| 10 mm | .3937 | 10 | 47% |
Neighboring sizes
Questions
What does 7/16-14 mean?
A 7/16″ nominal diameter with 14 threads per inch. It’s the coarse (UNC) thread for that size; the fine version is 7/16-20.
Can I use a 9.3 mm drill instead of U?
Usually. 9.3 mm is .3661″ against .3680″ for U, which changes the thread engagement by a few percent at most. The thread-percentage table above shows exactly how much thread each nearby drill leaves.