This specification applies to all features of the workpiece unless an individual tolerance is explicitly stated on the drawing.
The standard defines two tolerance classes: f (fine) and m (medium).
ISO 2768-1:1989 (MK) provides a set of standard tolerances for linear and angular dimensions. By applying these tolerances, designers and manufacturers can ensure a consistent and efficient approach to tolerancing, promoting interchangeability and reducing production costs. tolleranze iso 2768 mk
m is ±0.2 mm for dimensions 0.5–3 mm, and ±0.5 mm for dimensions >3 mm. 3. Angular Dimensions (Class m) Tolerances for angles are based on the length of the shorter side of the angle. Length of Short Side Up to 10 >10 to 50 >50 to 120 >120 to 400 >400 Tolerance ±1° ±0°30' ±0°20' ±0°10' ±0°5' 4. Geometrical Tolerances (Class k) These apply to the overall form and position of features. Straightness and Flatness Range of Length Up to 10 >10 to 30 >30 to 100 >100 to 300 >300 to 1000 Tolerance (mm) 0.05 0.1 0.2 0.4 0.6 Perpendicularity The tolerance is based on the longer of the two sides forming the right angle. Range of Length Up to 100 >100 to 300 >300 to 1000 >1000 to 3000 Tolerance (mm) 0.2 0.4 0.6 0.8 Symmetry and Run-out Symmetry: For class
Le tolleranze dimensionali definite dalla norma ISO 2768 MK sono le seguenti: This specification applies to all features of the
In sintesi, le tolleranze ISO 2768 MK rappresentano un riferimento importante per la progettazione e la produzione di componenti meccanici. La loro applicazione garantisce l'intercambiabilità e la compatibilità tra i pezzi, riducendo i rischi di errore e migliorando l'efficienza produttiva. È fondamentale che i progettisti e i produttori siano a conoscenza di queste tolleranze e le applichino correttamente per assicurare la qualità e l'affidabilità dei loro prodotti.
Although not part of the MK section, it's essential to mention that the standard also defines geometric tolerances for features such as: Angular Dimensions (Class m) Tolerances for angles are
| | Tolerance (± degrees / minutes) | |---------------------------------------------|--------------------------------------| | Up to 10 | ±1° | | >10 up to 50 | ±0°30' | | >50 up to 120 | ±0°20' | | >120 up to 400 | ±0°10' | | >400 | ±0°5' |
