Derive tolerance size and upper/lower limit dimensions from nominal size and upper/lower deviations for tolerance design and drawing checks.
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Tolerance | Tolerance = upper deviation - lower deviation | ISO 286-1:2010, Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes |
| Limits of size | Upper limit = nominal + upper deviation; lower limit = nominal + lower deviation | ISO 286-1:2010, Geometrical product specifications (GPS) - ISO code system for tolerances |
| Fundamental deviation | The position of the tolerance zone relative to the zero line is set by the fundamental deviation | ISO 286-1:2010, Geometrical product specifications (GPS) - ISO code system for tolerances |
| Tolerance grades | Standard tolerance grades are designated IT followed by a number, e.g. IT7 | ISO 286-1:2010, Geometrical product specifications (GPS) - ISO code system for tolerances |