To ensure the standard is enforced, it must be clearly stated in the title block of the engineering drawing. A standard notation would look like this: This single line tells the manufacturer that:

| Nominal Shorter Leg Length | Permissible Deviation | |----------------------------|------------------------| | Up to 100 | 0.2 | | >100 to 300 | 0.3 | | >300 to 1000 | 0.4 | | >1000 to 3000 | 0.5 |

are covered by linear tolerances, but you must consider the envelope principle. A 10 mm shaft (tolerance ±0.2 mm under m-class) can be between 9.8 and 10.2 mm – which is a very loose fit. For press-fits or sliding fits, ISO 2768-mh is inappropriate ; you must add individual tolerances (like H7/g6).

The standard changes for small features like chamfers and radii because achieving $\pm 0.2$ mm on a 0.5 mm chamfer is difficult and often unnecessary.

The "H" class establishes general tolerances for the form and position of features, ensuring parts fit together correctly in an assembly. General Tolerance - ISO 2768 1 & 2 - ZEISS Quality Forum