Iso 2768 General Tolerances Pdf Exclusive Jun 2026

ISO 2768 is an international manufacturing standard that simplifies technical drawings by establishing default tolerances for dimensions and geometric features that do not have individual tolerance indications. By referencing this standard (e.g., "ISO 2768-mK" in a title block), designers ensure that parts are manufactured to a consistent "workshop accuracy" without cluttering drawings with repetitive data.

ISO 2768 groups tolerances by:

The tolerance is given in mm per the length of the feature. For a 200mm long block with class "m," the flatness tolerance is 0.5mm. iso 2768 general tolerances pdf exclusive

ISO 2768-1 defines four tolerance classes (from loose to tight): ISO 2768 is an international manufacturing standard that

The primary goal of ISO 2768 is to streamline the communication between design and production. Without general tolerances, every single line on a drawing would require a manual tolerance entry, leading to cluttered, unreadable documents. For a 200mm long block with class "m,"

Straightness, flatness, perpendicularity, symmetry, circular run-out.

For symmetry and circular runout, the tolerance is equal to the numerical value of the geometrical tolerance class (e.g., Class "m" = 0.5mm tolerance zone), but never less than 0.01mm.