M14 × 1.5 Tap Drill Size & Thread Specs
Everything for a M14 × 1.5 fine pitch thread on one page: tap drill (12.5 mm), clearance holes, wrench and hex key sizes, and the nearest inch thread.
SP-TD-01 · M14 × 1.5
M14 × 1.5 specs
SizePlate
M14 × 1.5 · tap with
12.5 mm drill
.4921″
12.5 mm · 77% thread
- Inch drill
- 31/64 · .4844
- Clearance
- 15 / 15.5 mm
- Wrench
- 21 mm
- Cap screw key
- 12 mm
Thread
- Nominal size
- M14 · .5512″
- Pitch
- 1.5 mm · 16.9 TPI
- Series
- fine
- coarse pitch
- M14 × 2.0
Drilling
- Tap drill
- 12.5 mm · .4921
- Inch substitute
- 31/64 · .4844
- Close fit
- 15 mm
- Normal fit
- 15.5 mm
- Free fit
- 16.5 mm
Tools
- Hex head (ISO 4017)
- 21 mm
- Hex head (DIN 933)
- 22 mm
- Socket head cap key
- 12 mm
- Button head key
- —
- Flat head key
- —
Nearest inch
- Thread
- 9/16-12
- Major diameter
- .5625″
- Threads per inch
- 12
- Tap drill
- 31/64
- 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 |
|---|---|---|---|
| 12.4 mm | .4882 | 12.4 | 82% |
| 12.5 mm | .4921 | 12.5 | 77% |
| 12.6 mm | .4961 | 12.6 | 72% |
| 1/2 | .5000 | 12.7 | 67% |
| 12.7 mm | .5000 | 12.7 | 67% |
| 12.8 mm | .5039 | 12.8 | 62% |
| 12.9 mm | .5079 | 12.9 | 56% |
| 13 mm | .5118 | 13 | 51% |
| 33/64 | .5156 | 13.1 | 46% |
Neighboring sizes
- M12 × 1.5tap 10.5 mm
- M12 × 1.25tap 10.8 mm
- M14 × 2.0tap 12 mm
- M16 × 2.0tap 14 mm
- M16 × 1.5tap 14.5 mm
- M20 × 2.5tap 17.5 mm
Questions
What does M14 × 1.5 mean?
An ISO metric thread with a 14 mm major diameter and a 1.5 mm pitch (the distance from one thread crest to the next). It’s the fine pitch for M14.
Can I use a 31/64 drill instead?
Usually. 31/64 is .4844″ against .4921″ for the 12.5 mm drill, which changes the thread engagement by a few percent at most.