M4 × 0.7 Tap Drill Size & Thread Specs
Everything for a M4 × 0.7 coarse pitch thread on one page: tap drill (3.3 mm), clearance holes, wrench and hex key sizes, and the nearest inch thread.
SP-TD-01 · M4 × 0.7
M4 × 0.7 specs
SizePlate
M4 × 0.7 · tap with
3.3 mm drill
.1299″
3.3 mm · 77% thread
- Inch drill
- #30 · .1285
- Clearance
- 4.3 / 4.5 mm
- Wrench
- 7 mm
- Cap screw key
- 3 mm
Thread
- Nominal size
- M4 · .1575″
- Pitch
- 0.7 mm · 36.3 TPI
- Series
- coarse
- fine pitch
- M4 × 0.5
Drilling
- Tap drill
- 3.3 mm · .1299
- Inch substitute
- #30 · .1285
- Close fit
- 4.3 mm
- Normal fit
- 4.5 mm
- Free fit
- 4.8 mm
Tools
- Hex head (ISO 4017)
- 7 mm
- Hex head (DIN 933)
- 7 mm
- Socket head cap key
- 3 mm
- Button head key
- 2.5 mm
- Flat head key
- 2.5 mm
Nearest inch
- Thread
- #8-32
- Major diameter
- .1640″
- Threads per inch
- 32
- Tap drill
- #29
- 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 |
|---|---|---|---|
| #30 | .1285 | 3.26 | 81% |
| 3.3 mm | .1299 | 3.3 | 77% |
| 3.4 mm | .1339 | 3.4 | 66% |
| #29 | .1360 | 3.45 | 60% |
| 3.5 mm | .1378 | 3.5 | 55% |
| #28 | .1405 | 3.57 | 47% |
| 9/64 | .1406 | 3.57 | 47% |
Neighboring sizes
- M2.5 × 0.45tap 2.05 mm
- M3 × 0.5tap 2.5 mm
- M3 × 0.35tap 2.65 mm
- M4 × 0.5tap 3.5 mm
- M5 × 0.8tap 4.2 mm
- M5 × 0.5tap 4.5 mm
Questions
What does M4 × 0.7 mean?
An ISO metric thread with a 4 mm major diameter and a 0.7 mm pitch (the distance from one thread crest to the next). It’s the coarse pitch for M4.
Can I use a #30 drill instead?
Usually. #30 is .1285″ against .1299″ for the 3.3 mm drill, which changes the thread engagement by a few percent at most.