First, a crucial clarification: The DIN ISO designation indicates that a German standard (DIN) has adopted an international standard (ISO) without changes.
| Nominal Length Range (mm) | f / m | c / v | | :--- | :--- | :--- | | up to 10 | ±1° | ±1°30' | | >10 up to 50 | ±0°30' | ±1° | | >50 up to 120 | ±0°20' | ±0°30' | | >120 up to 400 | ±0°10' | ±0°15' | | >400 | ±0°5' | ±0°10' | For classes f and m, the same table applies. For c and v, the same table applies (wider). 5. Permissible Deviations for Radii and Chamfer Heights For nominal radius or chamfer height (in mm). Tolerance = ± value. din iso 2768
The standard you are referring to is and DIN ISO 2768-2 . First, a crucial clarification: The DIN ISO designation
| Nominal Size Range | f (Fine) | m (Medium) | c (Coarse) | v (Very coarse) | | :--- | :--- | :--- | :--- | :--- | | 0.5 up to 3 | ±0.05 | ±0.1 | ±0.2 | — | | >3 up to 6 | ±0.05 | ±0.1 | ±0.3 | ±0.5 | | >6 up to 30 | ±0.1 | ±0.2 | ±0.5 | ±1.0 | | >30 up to 120 | ±0.15 | ±0.3 | ±0.8 | ±1.5 | | >120 up to 400 | ±0.2 | ±0.5 | ±1.2 | ±2.5 | | >400 up to 1000 | ±0.3 | ±0.8 | ±2.0 | ±4.0 | | >1000 up to 2000 | ±0.5 | ±1.2 | ±3.0 | ±6.0 | | >2000 up to 4000 | — | ±2.0 | ±4.0 | ±8.0 | Values for "v" (Very coarse) start at >3 mm. 4. Permissible Deviations for Angular Dimensions (degrees/minutes) For nominal length of the shorter leg of the angle. The standard you are referring to is and DIN ISO 2768-2
| Nominal Size Range | f (Fine) | m (Medium) | c (Coarse) | v (Very coarse) | | :--- | :--- | :--- | :--- | :--- | | 0.5 up to 3 | ±0.2 | ±0.2 | ±0.4 | ±0.4 | | >3 up to 6 | ±0.5 | ±0.5 | ±1.0 | ±1.0 | | >6 up to 30 | ±1.0 | ±1.0 | ±2.0 | ±2.0 | For larger than 30 mm, tolerances are agreed separately or use linear dimension tolerances. 1. Scope This part applies to geometrical tolerances (straightness, flatness, perpendicularity, symmetry, runout) for features that are not individually tolerance on the drawing. 2. Tolerance Classes (3 Classes) | Class | Description | | :--- | :--- | | H | Precision | | K | Standard (most common) | | L | Rough | 3. General Tolerances for Straightness and Flatness (mm) | Nominal Length Range (mm) | H | K | L | | :--- | :--- | :--- | :--- | | up to 10 | 0.02 | 0.05 | 0.1 | | >10 up to 30 | 0.05 | 0.1 | 0.2 | | >30 up to 100 | 0.1 | 0.2 | 0.4 | | >100 up to 300 | 0.2 | 0.4 | 0.8 | | >300 up to 1000 | 0.3 | 0.6 | 1.2 | | >1000 up to 3000 | 0.4 | 0.8 | 1.6 | 4. General Tolerances for Perpendicularity (mm) Perpendicularity tolerance = the value from the straightness/flatness table, but applied to the shorter side.