General Tolerance Iso 2768-mk ((new)) Jun 2026

Refers to Part 1 of the standard, covering Linear and Angular dimensions . The 'm' stands for Medium .

The designation "ISO 2768-mK" is split into two distinct parts, each governing a different aspect of geometric and dimensional accuracy.

In the world of precision manufacturing, are the unsung heroes that ensure a part fits, functions, and is economical to produce. Without them, manufacturers and designers would find themselves in a perpetual state of guesswork, leading to parts that fail to assemble, inconsistent quality, and costly rework.

Governs geometrical tolerances (e.g., straightness, flatness, perpendicularity, and symmetry). The Four Tolerance Classes for Linear Dimensions (Part 1) general tolerance iso 2768-mk

Enter — the most common general tolerance standard you will encounter on CNC machining and sheet metal drawings worldwide. This comprehensive guide will unpack everything you need to know, from what the "m" and "K" actually stand for, to detailed tolerance tables, practical application tips, and common pitfalls to avoid.

Tighter tolerances (like ISO 2768-f) can be 2 to 2.5 times harder and more expensive to machine. The "mK" class offers a sweet spot between precision and production speed.

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. Refers to Part 1 of the standard, covering

| Nominal Length Range (mm) | Class f (Fine) | Class m (Medium) | Class c (Coarse) | Class v (Very Coarse) | | :--- | :---: | :---: | :---: | :---: | | | ±0.05 | ±0.10 | ±0.20 | — | | 3 up to 6 | ±0.05 | ±0.10 | ±0.30 | ±0.50 | | 6 up to 30 | ±0.10 | ±0.20 | ±0.50 | ±1.00 | | 30 up to 120 | ±0.15 | ±0.30 | ±0.80 | ±1.50 | | 120 up to 400 | ±0.20 | ±0.50 | ±1.20 | ±2.50 | | 400 up to 1000 | ±0.30 | ±0.80 | ±2.00 | ±4.00 | | 1000 up to 2000 | ±0.50 | ±1.20 | ±3.00 | ±6.00 | | 2000 up to 4000 | — | ±2.00 | ±4.00 | ±8.00 |

These tolerances ensure a surface or line isn't excessively curved or warped. For class , the limits are based on the length of the longest side: Length of Surface/Line (mm) Tolerance (mm) 100 to 300 300 to 1000 Information according to Engineers Edge . Other Geometrical Controls in Class K

While ISO 2768-mK is incredibly versatile, it is not a blanket solution for every dimension on a print. Keep the following rules in mind: In the world of precision manufacturing, are the

Engineers can focus their energy on calculating precise tolerances for critical mating features (like press fits or bearing seats) while leaving the rest to the standard.

ISO 2768-mK is an international standard that defines general tolerances for machining processes, such as CNC machining . It is typically indicated in the drawing's title block as "General Tolerance: ISO 2768-mK".