M16 × 1.5 Tap Drill Size & Thread Specs
Everything for a M16 × 1.5 fine pitch thread on one page: tap drill (14.5 mm), clearance holes, wrench and hex key sizes, and the nearest inch thread.
SP-TD-01 · M16 × 1.5
M16 × 1.5 specs
SizePlate
M16 × 1.5 · tap with
14.5 mm drill
.5709″
14.5 mm · 77% thread
- Inch drill
- 37/64 · .5781
- Clearance
- 17 / 17.5 mm
- Wrench
- 24 mm
- Cap screw key
- 14 mm
Thread
- Nominal size
- M16 · .6299″
- Pitch
- 1.5 mm · 16.9 TPI
- Series
- fine
- coarse pitch
- M16 × 2.0
Drilling
- Tap drill
- 14.5 mm · .5709
- Inch substitute
- 37/64 · .5781
- Close fit
- 17 mm
- Normal fit
- 17.5 mm
- Free fit
- 18.5 mm
Tools
- Hex head (ISO 4017)
- 24 mm
- Hex head (DIN 933)
- 24 mm
- Socket head cap key
- 14 mm
- Button head key
- 10 mm
- Flat head key
- 10 mm
Nearest inch
- Thread
- 5/8-11
- Major diameter
- .6250″
- Threads per inch
- 11
- Tap drill
- 17/32
- 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 |
|---|---|---|---|
| 14.5 mm | .5709 | 14.5 | 77% |
| 37/64 | .5781 | 14.68 | 68% |
| 15 mm | .5906 | 15 | 51% |
| 19/32 | .5938 | 15.08 | 47% |
Neighboring sizes
- M14 × 2.0tap 12 mm
- M14 × 1.5tap 12.5 mm
- M16 × 2.0tap 14 mm
- M20 × 2.5tap 17.5 mm
- M20 × 1.5tap 18.5 mm
- M24 × 3.0tap 21 mm
Questions
What does M16 × 1.5 mean?
An ISO metric thread with a 16 mm major diameter and a 1.5 mm pitch (the distance from one thread crest to the next). It’s the fine pitch for M16.
Can I use a 37/64 drill instead?
Usually. 37/64 is .5781″ against .5709″ for the 14.5 mm drill, which changes the thread engagement by a few percent at most.