ISO Thread Specifications
Metric threads only.
M 16 x 2 - 4h -5H
- M — ISO Metric designation
- 16 — Nominal diameter in millimeters
- 2 — Thread pitch in millimeters (distance from top of one thread to top of the next)
- 4h — Class of fit of this thread (optional)
- 5H — Class of fit of mating thread (optional)