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The ISO 2768 standard is an international manufacturing guideline that simplifies technical drawings by establishing for linear and angular dimensions, as well as geometrical features . By using this standard, engineers can avoid the tedious process of specifying individual tolerances for every single dimension, provided the parts are produced via machining or material removal processes. Structure of the ISO 2768 Standard
| Nominal Size (mm) | Tolerance (Class "m") | | :--- | :--- | | 0.5 up to 3 | $\pm 0.1$ | | over 3 up to 6 | $\pm 0.1$ | | over 6 up to 30 | $\pm 0.2$ | | over 30 up to 120 | $\pm 0.3$ | | over 120 up to 400 | $\pm 0.5$ | | over 400 up to 1000 | $\pm 0.8$ | iso 2768 standard pdf
This part covers:
When you see a drawing block that says “ISO 2768-mK” , the 'm' refers to Part 1 (Medium linear), and the 'K' refers to Part 2 (Standard geometry). ISO standards are copyrighted
The standard was built in two distinct parts that work together to define a part's "identity": ISO 2768 Certification: Definitions, Industries, Processes
This is the part most people forget. Part 2 covers: The ISO 2768 standard is an international manufacturing
Here is a quick snapshot of what "Medium" tolerance allows for various linear sizes:
Disclaimer: This post is for informational purposes. Always consult the official ISO document for legal and contractual compliance.
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