General Tolerance Iso 2768-mk

The designation consists of two lowercase and uppercase letters, each representing a specific tolerance class from a different part of the ISO 2768 standard:

These values are determined based on the length of the longest surface line or the nominal length of the surface. Nominal Length Range (mm) Flatness/Straightness Tolerance Class K (mm) 100 to 300 300 to 1000 1000 to 3000 2. Perpendicularity

The ISO 2768-mK standard provides a robust, medium-precision baseline ( general tolerance iso 2768-mk

"Medium" tolerances align perfectly with standard workshop capabilities. Machinists can run CNC machines at optimal speeds without slowing down to chase unnecessarily tight tolerances on non-critical features.

Under ISO 2768-1, there are four tolerance classes: f (fine), m (medium), c (coarse), and v (very coarse). The class is the most frequently used in general mechanical engineering. Linear Dimensions (mm) The designation consists of two lowercase and uppercase

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While Part 1 handles size, Part 2 handles the of the part. The K class provides standard control over how straight, flat, or perpendicular a feature must be. Straightness and Flatness Machinists can run CNC machines at optimal speeds

When a drawing states , it is referencing both parts: the 'm' (medium) from Part 1 for linear/angular tolerances, and the 'k' (medium) from Part 2 for geometrical tolerances.

Defines geometric tolerances (form and position). The 'K' stands for "K" class (a moderate level of precision).

The standard defines the exact rules for general tolerances of linear, angular, and geometrical dimensions in mechanical engineering. By specifying "m" (medium accuracy) for linear dimensions and "K" (medium accuracy) for geometrical tolerances, this standard removes the need to detail individual tolerances for every feature on a technical drawing.

Section A