Iso 2768-mh Tolerance Chart -

In practice, for most machined parts under 120 mm, you get ±1 degree.

Tolerance (grade m) for length L (mm):

✅ Example: A 20 mm diameter hole with no tolerance is allowed to be 20.00 mm to 20.33 mm. It can never be 19.98 mm. iso 2768-mh tolerance chart

| Class | Linear (6-30mm) | Geometric (Flatness per 100mm) | Typical Application | | :--- | :--- | :--- | :--- | | | ±0.05mm | 0.1mm | Precision instruments, aerospace backups | | m (Medium) | ±0.2mm | 0.2mm | General machining, welding fixtures | | c (Coarse) | ±0.5mm | 0.4mm | Sand castings, agricultural equipment | | v (Very Coarse) | ±1.0mm | 0.8mm | Rough fabrications, concrete molds | In practice, for most machined parts under 120