ISO Metric Coarse Thread · DIN 13-1 / ISO 261
M68 Thread: Pitch, Tap Drill & Dimensions
M68 is an ISO metric coarse thread with a 6 mm pitch. The tap drill is 62 mm, and the internal minor diameter D1 is 61.505 mm.
| Nominal (major) diameter | 68 mm |
|---|---|
| Pitch | 6 mm (coarse) |
| Tap drill (D − P) | 62 mm |
| Pitch diameter d2 / D2 | 64.103 mm |
| Minor diameter, external d3 | 60.639 mm |
| Minor diameter, internal D1 | 61.505 mm |
| Thread depth, external h3 | 3.68 mm |
| Flank angle | 60° |
Common questions
What size drill do I use to tap M68?
Use a 62 mm drill. This is the standard tap drill for M68; for hard materials or deep threads a slightly larger drill reduces tapping torque.
What is the pitch of M68?
The pitch of M68 is 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.