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General Tolerances ISO 2768-m
Angular tolerances are defined by the length of the shorter leg forming the angle.
and runout also have general values in ISO 2768-2, but these are less frequently invoked without individual callouts. iso 2768 medium
The "Medium" class represents the sweet spot of modern machining—strict enough to ensure assembly, yet loose enough to maintain economic viability. Proper application of ISO 2768-m is a hallmark of efficient engineering design and professional drafting practice.
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It does not apply to:
By applying ISO 2768-m, manufacturers can utilize standard machine tools without requiring extreme precision controls. If a dimension is non-critical (e.g., the overall length of a complex bracket that does not interface with another part), the designer does not need to calculate a specific tolerance. The workshop assumes the general tolerance "m" is sufficient, reducing inspection time and cost. Proper application of ISO 2768-m is a hallmark
Inspectors must understand that dimensions falling under the general tolerance are not "free." They must still be inspected, but usually via sampling rather than 100% inspection. If a part falls outside the "m" range, it is considered non-conforming.