| Shorter leg length (mm) | Permitted deviation | |-------------------------|----------------------| | ≤ 10 | ±1° | | >10 – 50 | ±0°30’ | | >50 – 120 | ±0°20’ | | >120 – 400 | ±0°10’ | | >400 | ±0°5’ | Applies to angles expressed in degrees, not to right angles or 0°/180° explicitly. Tighter than general “H” class. Applies to straightness, flatness, circularity, cylindricity, parallelism, perpendicularity, symmetry, and runout if no separate geometric tolerance is given.
| Nominal size range (mm) | Tolerance (mm) | |-------------------------|----------------| | ≤ 10 | 0.05 | | >10 – 30 | 0.10 | | >30 – 100 | 0.15 | | >100 – 300 | 0.20 | | >300 – 1000 | 0.30 | | >1000 – 3000 | 0.40 | iso 2768 fk
| Nominal size range | Permitted deviation (mm) | |--------------------|--------------------------| | 0.5 – 3 | ±0.05 | | >3 – 6 | ±0.05 | | >6 – 30 | ±0.10 | | >30 – 120 | ±0.15 | | >120 – 400 | ±0.20 | | >400 – 1000 | ±0.30 | | >1000 – 2000 | ±0.50 | Example: A 50 mm shaft diameter → allowable range = 49.85 mm to 50.15 mm. For angles without individual tolerance (e.g., chamfers, tapered angles): | Shorter leg length (mm) | Permitted deviation