The "MH" in ISO 2768-MH refers to the specific tolerance class, which defines the level of precision and the acceptable limits of variation for different dimensions. The ISO 2768 standard includes several tolerance classes, including f (fine), m (medium), c (coarse), and v (very coarse), with MH being one of the most commonly used classes.
Avoids unneeded "fine" tolerances that increase machining time and tooling cost. iso 2768-mh tolerance chart
Need tighter control? Specify individual tolerances or upgrade to (fine). The "MH" in ISO 2768-MH refers to the