The ISO 2768 standard defines general tolerances for linear and angular dimensions, as well as geometric characteristics, to simplify engineering drawings and manufacturing processes. It ensures that parts can be produced with "customary workshop accuracy" without requiring a specific tolerance for every individual dimension. Structure of ISO 2768 The standard is divided into two primary parts:
| Range of Nominal Sizes (mm) | Tolerance Class f (Fine) | Tolerance Class m (Medium) | Tolerance Class c (Coarse) | Tolerance Class 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 |
These define the allowable deviation for shape and orientation: waterson.com : High precision. : Standard precision. : Lower precision. Benefits of Using ISO 2768 General Tolerances to DIN ISO 2768
(Note: Values above are approximate summaries; always consult the official PDF for the exact table.)
Download it. Specifically, look for a PDF that includes ISO 2768-1 (Linear) and ISO 2768-2 (Geometric) on two facing pages. Print it, laminate it, and hang it by the CNC machine. Just remember that "General Tolerance" means "Don't care" – if the part actually matters, put a specific tolerance on the dimension.
The ISO 2768 standard defines general tolerances for linear and angular dimensions, as well as geometric characteristics, to simplify engineering drawings and manufacturing processes. It ensures that parts can be produced with "customary workshop accuracy" without requiring a specific tolerance for every individual dimension. Structure of ISO 2768 The standard is divided into two primary parts:
| Range of Nominal Sizes (mm) | Tolerance Class f (Fine) | Tolerance Class m (Medium) | Tolerance Class c (Coarse) | Tolerance Class 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 | Iso 2768 General Tolerances Pdf
These define the allowable deviation for shape and orientation: waterson.com : High precision. : Standard precision. : Lower precision. Benefits of Using ISO 2768 General Tolerances to DIN ISO 2768 The ISO 2768 standard defines general tolerances for
(Note: Values above are approximate summaries; always consult the official PDF for the exact table.) f (fine): For precision manufacturing
Download it. Specifically, look for a PDF that includes ISO 2768-1 (Linear) and ISO 2768-2 (Geometric) on two facing pages. Print it, laminate it, and hang it by the CNC machine. Just remember that "General Tolerance" means "Don't care" – if the part actually matters, put a specific tolerance on the dimension.
