M3 × 0.35 Tap Drill Size & Thread Specs
Everything for a M3 × 0.35 fine pitch thread on one page: tap drill (2.65 mm), clearance holes, wrench and hex key sizes, and the nearest inch thread.
SP-TD-01 · M3 × 0.35
M3 × 0.35 specs
SizePlate
M3 × 0.35 · tap with
2.65 mm drill
.1043″
2.65 mm · 77% thread
- Inch drill
- #37 · .1040
- Clearance
- 3.2 / 3.4 mm
- Wrench
- 5.5 mm
- Cap screw key
- 2.5 mm
Thread
- Nominal size
- M3 · .1181″
- Pitch
- 0.35 mm · 72.6 TPI
- Series
- fine
- coarse pitch
- M3 × 0.5
Drilling
- Tap drill
- 2.65 mm · .1043
- Inch substitute
- #37 · .1040
- Close fit
- 3.2 mm
- Normal fit
- 3.4 mm
- Free fit
- 3.6 mm
Tools
- Hex head (ISO 4017)
- 5.5 mm
- Hex head (DIN 933)
- 5.5 mm
- Socket head cap key
- 2.5 mm
- Button head key
- 2 mm
- Flat head key
- 2 mm
Nearest inch
- Thread
- #4-40
- Major diameter
- .1120″
- Threads per inch
- 40
- Tap drill
- #43
- 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 |
|---|---|---|---|
| #37 | .1040 | 2.64 | 79% |
| 2.65 mm | .1043 | 2.65 | 77% |
| 2.7 mm | .1063 | 2.7 | 66% |
| #36 | .1065 | 2.71 | 65% |
| 7/64 | .1094 | 2.78 | 49% |
| #35 | .1100 | 2.79 | 45% |
Neighboring sizes
- M2 × 0.4tap 1.6 mm
- M2.5 × 0.45tap 2.05 mm
- M3 × 0.5tap 2.5 mm
- M4 × 0.7tap 3.3 mm
- M4 × 0.5tap 3.5 mm
- M5 × 0.8tap 4.2 mm
Questions
What does M3 × 0.35 mean?
An ISO metric thread with a 3 mm major diameter and a 0.35 mm pitch (the distance from one thread crest to the next). It’s the fine pitch for M3.
Can I use a #37 drill instead?
Usually. #37 is .1040″ against .1043″ for the 2.65 mm drill, which changes the thread engagement by a few percent at most.