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(e.g., straightness, flatness, perpendicularity, and symmetry). Precision Levels (Tolerance Classes)
The standard provides a set of general tolerance zones, which are used to specify the acceptable limits of variation for these geometric characteristics.
If only linear tolerances are required, you may simply write: ISO 2768-m . Iso 2768 General Tolerances Pdf
When applying this standard, a designer typically indicates a specific tolerance class in the drawing's title block (e.g., "ISO 2768-mK"). Part 1: Linear and Angular Classes These are based on the nominal size of the dimension: : Highest precision class. m (medium) : Standard "workshop accuracy" for most machined parts. c (coarse) : For parts with lower precision requirements. v (very coarse) : Least restrictive class. Part 2: Geometrical Classes
Elias pulled up the table on a screen. "Look here," he pointed to the classes: f (fine) , m (medium) , c (coarse) , and v (very coarse) . When applying this standard, a designer typically indicates
ISO 2768 is extensively applied in the production of automotive components, including engine parts, transmission components, chassis elements, and interior fittings. The standard ensures that parts from different suppliers mate correctly and function as intended.
ISO 2768 relies on "plus-minus" tolerancing for geometry, which can lead to mathematical ambiguities in 3D Coordinate Measuring Machines (CMM) and modern CAD/CAM software. ISO 22081 establishes general geometric tolerances using a more robust system linked directly to the Geometrical Product Specifications (GPS) system. c (coarse) : For parts with lower precision requirements
To ensure smooth manufacturing when using general tolerances:
Selecting the appropriate tolerance class is a critical design decision that balances precision requirements against manufacturing cost and feasibility.
Circular run-out tolerances are uniform across classes and apply to the total deviation during a full 360-degree rotation. 0.1 mm Class K: 0.2 mm Class L: 0.5 mm How to Indicate ISO 2768 on a Drawing
Defines standard workshop accuracy, preventing unnecessary precision that drives up machining costs.
