ISO 2768‑1 defines general tolerances for linear and angular dimensions on drawings when no specific tolerance is given. "m" = medium tolerance class; "k" = coarse for form and position? — ISO 2768 uses two parts: Part 1 (general tolerances — linear/angular) with tolerance classes f (fine), m (medium), c (coarse), v (very coarse); Part 2 (geometrical tolerances — form and position) with symbols for tolerances (no separate k). Here “mk” likely means linear class m and unspecified geometric class (commonly k is not part of ISO 2768 — confirm in standard).
ISO 2768-1: General Tolerances for Linear and Angular Dimensions (The "m") general tolerance iso 2768-mk
Note: For symmetry and runout (ISO 2768-2), the ‘k’ class generally allows 0.2mm for most common part sizes. ISO 2768‑1 defines general tolerances for linear and
You will rarely see (Fine) because it is too expensive to machine for generic features. You will rarely see ISO 2768-c (Coarse) because it usually looks sloppy on a drawing. Here “mk” likely means linear class m and
Understanding General Tolerance ISO 2768-mk In the world of precision manufacturing, specifying a tolerance for every single dimension on a technical drawing is both time-consuming and prone to error. is an international standard designed to solve this by providing "general tolerances" that act as a default for any dimension without an individual specification.
The designation consists of two separate parts that define the accuracy level for different features:
Because it's an international standard, a part designed with ISO 2768-mK in Germany can be manufactured in Australia or the US with zero ambiguity. Breaking Down the Tables
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