M5 × 0.5 Tap Drill Size & Thread Specs
Everything for a M5 × 0.5 fine pitch thread on one page: tap drill (4.5 mm), clearance holes, wrench and hex key sizes, and the nearest inch thread.
SP-TD-01 · M5 × 0.5
M5 × 0.5 specs
SizePlate
M5 × 0.5 · tap with
4.5 mm drill
.1772″
4.5 mm · 77% thread
- Inch drill
- #16 · .1770
- Clearance
- 5.3 / 5.5 mm
- Wrench
- 8 mm
- Cap screw key
- 4 mm
Thread
- Nominal size
- M5 · .1969″
- Pitch
- 0.5 mm · 50.8 TPI
- Series
- fine
- coarse pitch
- M5 × 0.8
Drilling
- Tap drill
- 4.5 mm · .1772
- Inch substitute
- #16 · .1770
- Close fit
- 5.3 mm
- Normal fit
- 5.5 mm
- Free fit
- 5.8 mm
Tools
- Hex head (ISO 4017)
- 8 mm
- Hex head (DIN 933)
- 8 mm
- Socket head cap key
- 4 mm
- Button head key
- 3 mm
- Flat head key
- 3 mm
Nearest inch
- Thread
- #10-24
- Major diameter
- .1900″
- Threads per inch
- 24
- Tap drill
- #25
- 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 |
|---|---|---|---|
| #16 | .1770 | 4.5 | 78% |
| 4.5 mm | .1772 | 4.5 | 77% |
| #15 | .1800 | 4.57 | 66% |
| 4.6 mm | .1811 | 4.6 | 62% |
| #14 | .1820 | 4.62 | 58% |
| #13 | .1850 | 4.7 | 46% |
| 4.7 mm | .1850 | 4.7 | 46% |
Neighboring sizes
- M4 × 0.7tap 3.3 mm
- M4 × 0.5tap 3.5 mm
- M5 × 0.8tap 4.2 mm
- M6 × 1.0tap 5 mm
- M6 × 0.75tap 5.2 mm
- M8 × 1.25tap 6.8 mm
Questions
What does M5 × 0.5 mean?
An ISO metric thread with a 5 mm major diameter and a 0.5 mm pitch (the distance from one thread crest to the next). It’s the fine pitch for M5.
Can I use a #16 drill instead?
Usually. #16 is .1770″ against .1772″ for the 4.5 mm drill, which changes the thread engagement by a few percent at most.