| Nominal Dimension (mm) | Tolerance (mm) | | :--- | :--- | | 0.5 up to 3 | ± 0.1 | | Over 3 up to 6 | ± 0.1 | | Over 6 up to 30 | ± 0.2 | | Over 30 up to 120 | ± 0.3 | | Over 120 up to 400 | ± 0.5 | | Over 400 up to 1000 | ± 0.8 | | Over 1000 up to 2000 | ± 1.2 |
Here is how Class handles geometric variations: 1. Straightness and Flatness These
This article provides a deep dive into the ISO 2768-mK standard, explaining the meaning of the codes, breaking down the tolerance tables, and discussing why engineers frequently search for a "Tolerance ISO 2768 Mk PDF" to streamline their design process. ISO 2768 is an international standard (International Organization for Standardization) titled “General tolerances for linear and angular dimensions and geometrical tolerances for features without individual tolerance indications.”
In the world of mechanical engineering and manufacturing, a drawing without tolerances is merely a picture, not a blueprint. Tolerances dictate the limits of variation, ensuring that a part manufactured in one facility will fit perfectly with a part manufactured in another. While specific tolerances can be attached to every single dimension, this clutters drawings and creates unnecessary administrative burden.
This is where the general tolerance standard comes into play. Specifically, the designation ISO 2768-mK represents a specific class of precision that balances manufacturability with functionality.
Here is a reference table for the class:
In simpler terms, ISO 2768 applies to dimensions that do not have a specific tolerance written next to them (e.g., a dimension written simply as "50" rather than "50 ± 0.1").