Engineering tolerance

Engineering tolerance is the ability of a machine to cope with changes while still continuing to work. This includes changes to size, quality (for example, the smoothness of the surface), the outside world (for example, dampness or heat). When a machine is made the needed engineering tolerance is set to provide a balance between performance and the need to cope with the changes it may experience.

Engineering Tolerance Media

Example for the DIN ISO 2768-2 tolerance table. This is just one example for linear tolerances for a 100 mm value. This is just one of the 8 defined ranges (30–120 mm).
Summary of basic size, fundamental deviation and IT grades compared to minimum and maximum sizes of the shaft and hole
Limits and fits establish in 1980, not corresponding to the current ISO tolerances

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