1. Overview ISO 2768 is an international standard for general tolerances – also known as limit deviations – for linear and angular dimensions without individual tolerance indications on a technical drawing. It applies to features manufactured by material removal (machining, turning, milling) or forming (casting, forging, sheet metal).

| Nominal length range (mm) | Flatness/Straightness (mm) | Perpendicularity (mm) | |---------------------------|----------------------------|------------------------| | ≤10 | 0.05 | 0.1 | | >10 to 30 | 0.1 | 0.2 | | >30 to 100 | 0.2 | 0.4 | | >100 to 300 | 0.4 | 0.6 | | >300 to 1000 | 0.6 | 0.8 | | >1000 to 3000 | 0.8 | 1.0 |

For class: