Sometimes, engineering drawings don’t list a tolerance for every single dimension. In those cases, general tolerances apply. These are standard limits applied across the drawing unless otherwise noted.
These tolerances are often written as a note, like “ISO 2768-m,” meaning that the medium tolerance class of the ISO 2768 standard applies to all unspecified dimensions.
A note on the drawing invokes the tolerance class—fine (F), medium (M), coarse (C), or very coarse (V)—and a table provides tolerance values for typical size ranges.
When a drawing shows “ISO 2768-m,” every unspecified linear dimension follows the M (medium) column values in the table above. Designers still override general tolerances with specific ones when precision is critical.
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