The uppercase represents the tolerance class for geometrical characteristics (Part 2). Deconstructing ISO 2768-mK
For a length up to 100mm, the 'k' class allows a 0.2mm deviation.
A feature for establishes a "medium" precision standard for parts, ensuring they are manufactured within acceptable limits for both size and shape without requiring individual tolerance callouts for every dimension. The designation breaks down into two parts: general tolerance iso 2768-mk
While the "m" part dictates size, the "k" part dictates form and position. ISO 2768 Part 2 ensures that parts are straight, flat, and perpendicular enough to function correctly, even if specific Geometric Dimensioning and Tolerancing (GD&T) symbols are missing from the drawing. Straightness and Flatness
Below is a snapshot of the allowable deviations for linear dimensions under the "m" (medium) class: Dimension Range (mm) Tolerance (± mm) 120 to 400 400 to 1000 Best Practices for Implementation The uppercase represents the tolerance class for geometrical
| Nominal Length Range (mm) | Permissible Deviation ('K' Class, mm) | | :--- | :--- | | up to 10 | 0.05 | | over 10 up to 30 | 0.10 | | over 30 up to 100 | 0.20 | | over 100 up to 300 | 0.40 | | over 300 up to 1000 | 0.60 | | over 1000 up to 3000 | 0.80 |
In mechanical engineering and manufacturing, specifying precise dimensions for every single feature on a technical drawing is highly inefficient. To streamline the design-to-manufacturing pipeline, engineers rely on general tolerance standards. The designation breaks down into two parts: While
This part of the standard specifies general geometrical tolerances for features that do not have individual specifications. It mainly applies to features produced by removal of material and provides three tolerance classes: H (fine), K (medium), and L (coarse).