| Nominal Length Range (mm) | Tolerance (mm) | | --- | --- | | Up to 10 | 0.05 | | >10 up to 30 | 0.1 | | >30 up to 100 | 0.2 | | >100 up to 300 | 0.4 | | >300 up to 1000 | 0.6 | | >1000 up to 3000 | 0.8 |
| Nominal length of shorter side | Tolerance K | |--------------------------------|-------------| | ≤100 | 0.2 | | >100 – 300 | 0.3 | | >300 – 1000 | 0.4 | | >1000 – 3000 | 0.5 | Tolerance Iso 2768 Mk Pdf
Here is a reference table for the class: | Nominal Length Range (mm) | Tolerance (mm)
Therefore, implies a drawing where linear dimensions are held to a "Medium" standard, and geometric features are held to a "Medium" standard. This is the "sweet spot" for the vast majority of machined metal parts. It changes with size
Never assume “Medium is always ±0.2”. It changes with size. Always refer to your printed Tolerance ISO 2768 MK PDF reference sheet.
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.