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Prevents over-engineering by applying appropriate tolerances based on the manufacturing process. 🔍 Resources & Downloads

ISO 2768-1 defines the allowable variation for lengths, radii, chamfers, and angles produced by removing material (e.g., machining). It does not typically apply to dimensions that are not in normal manufacturing processes, such as casting or welding, unless otherwise specified. Tolerance Classes (Part 1)

The most common standard for general engineering. c (Coarse): Used for rough parts or non-mating surfaces.

Machinists can instantly check allowable errors during CNC programming or manual machining quality checks.

Remember: the right tolerance class balances cost against precision. Choose wisely, specify clearly, and always document your decisions. With the comprehensive tables and guidance provided in this article, you now have the knowledge to confidently apply ISO 2768 to your engineering projects.

Designers can quickly check if a standard "medium" tolerance fits their assembly needs.

As of 2025, the 1989 versions are still current. ISO has not superseded these standards. Always check the ISO website for the latest "Status: Current".