ISO Metric Coarse Thread · DIN 13-1 / ISO 261
M3.5 Thread: Pitch, Tap Drill & Dimensions
M3.5 is an ISO metric coarse thread with a 0.6 mm pitch. The tap drill is 2.9 mm, and the internal minor diameter D1 is 2.85 mm.
| Nominal (major) diameter | 3.5 mm |
|---|---|
| Pitch | 0.6 mm (coarse) |
| Tap drill (D − P) | 2.9 mm |
| Pitch diameter d2 / D2 | 3.11 mm |
| Minor diameter, external d3 | 2.764 mm |
| Minor diameter, internal D1 | 2.85 mm |
| Thread depth, external h3 | 0.368 mm |
| Flank angle | 60° |
Common questions
What size drill do I use to tap M3.5?
Use a 2.9 mm drill. This is the standard tap drill for M3.5; for hard materials or deep threads a slightly larger drill reduces tapping torque.
What is the pitch of M3.5?
The pitch of M3.5 is 0.6 mm (coarse), meaning the thread advances that distance in one full turn.
Where can I find other ISO Metric Coarse Thread sizes?
The full ISO Metric Coarse Thread table, with every size and a live filter, is on its standard page, and the Thread Finder searches all 73 standards at once.
Reference values; computed values use the ISO basic profile. Verify against the current standard before production use.