Functionality. 'cL' is too loose for sliding fits, rotating shafts, or aligned mounting holes. 'mk' ensures basic interchangeability.
This section covers geometric deviations (form and position) for features without individual tolerance indications. It is divided into three classes: general tolerance iso 2768-mk
| Nominal Length Range | Tolerance (mm) | |----------------------|----------------| | ≤ 100 | 0.2 | | >100 – 300 | 0.3 | | >300 – 1000 | 0.4 | | >1000 – 3000 | 0.5 | Functionality
While ISO 2768-MK provides a useful guideline for general tolerances, there are limitations and considerations: This section covers geometric deviations (form and position)
| Nominal Size Range (Shorter leg in mm) | Tolerance (± degrees/min) | | :--- | :--- | | Up to 10 | ± 1° | | Over 10 up to 50 | ± 0° 30' | | Over 50 up to 120 | ± 0° 20' | | Over 120 up to 400 | ± 0° 10' | | Over 400 | ± 0° 5' |
ISO 2768 is an international standard created by the International Organization for Standardization. It provides a set of general tolerances for linear and angular dimensions without individual tolerance indications.
It is tight enough to ensure parts fit together without wobbling, but loose enough that a standard 3-axis CNC mill can hit it every time without inspection headaches.