Iso 2768-mh Tolerance Chart Hot! Info

This defines the tolerances for geometrical characteristics (flatness, straightness, symmetry). The "h" stands for High (the strictest level for geometry). Part 1: ISO 2768-1 (Linear Dimensions)

❌ – H is for holes only. For shafts, use “mK” or specify individually. ❌ Assuming bilateral tolerances for holes – H holes are unilateral (+/0). ❌ Using mH for welded or cast parts – ISO 2768 is for metal removal (machining), not raw castings. ❌ Forgetting angular tolerances – 1 degree is large. If you need 0.5°, specify it. iso 2768-mh tolerance chart

The following table provides an example of the ISO 2768-MH tolerance chart for linear dimensions: For shafts, use “mK” or specify individually

To implement this, simply add a note in or near the title block of your technical drawing: When NOT to Use It ❌ Forgetting angular tolerances – 1 degree is large

Based on the shorter side length of the angle.

ISO 2768 is an international standard designed to simplify drawing indications by specifying general tolerances for dimensions that do not have an individual tolerance indicated. It is most commonly applied to parts produced by metal removal processes (like CNC machining) or those formed from sheet metal.

Instead of marking ±0.1 or ±0.2 on every edge and surface, you should place a general note in the title block of your technical drawing. "General Tolerances ISO 2768-mH"