This part covers linear sizes (lengths, diameters) and angular sizes. It establishes four tolerance classes to account for different levels of manufacturing precision:
These features have slightly different tolerance tables,
The ISO 2768 standard is a foundational document in mechanical engineering, providing a global language for general tolerances Iso 2768 General Tolerances Pdf
on technical drawings. By referencing this standard, engineers can avoid the tedious and cluttering task of specifying individual tolerances for every single dimension, relying instead on a set of "default" accuracy levels. Why ISO 2768 is Essential
In modern manufacturing, every feature on a part has a theoretical size and shape, but real-world processes like CNC machining or sheet metal forming always involve slight deviations. ISO 2768 ensures that: Standard Tolerances in Manufacturing: ISO 2768 & ISO 286 This part covers linear sizes (lengths, diameters) and
| Range of Nominal Length of Shorter Side (mm) | Grade H | Grade K | Grade L | | :--- | :--- | :--- | :--- | | up to 100 | 0.2 | 0.4 | 0.6 | | >100 up to 300 | 0.3 | 0.6 | 1.0 | | >300 up to 1000 | 0.4 | 0.8 | 1.5 | | >1000 up to 3000 | 0.5 | 1.0 | 2.0 |
In the title block or general notes:
"General tolerances ISO 2768-mK"
Other combos: -fH, -cL, -vK, etc.
To make the most of this standard in your workflow: