The ISO 2768 standard, published by the International Organization for Standardization (ISO), provides general tolerances for linear and angular dimensions. The standard defines medium tolerance classes for various types of features, including linear dimensions, angular dimensions, and geometric tolerances.
| Nominal Dimension Range (Shorter leg length in mm) | Tolerance Class (Fine) | Tolerance Class m (Medium) | Tolerance Class c (Coarse) | Tolerance Class v (Very Coarse) | | :--- | :--- | :--- | :--- | :--- | | Up to 10 | ± 1° | ± 1° | ± 1° 30' | ± 3° | | Over 10 up to 50 | ± 0° 30' | ± 0° 30' | ± 1° | ± 2° | | Over 50 up to 120 | ± 0° 20' | ± 0° 20' | ± 0° 30' | ± 1° | | Over 120 up to 400 | ± 0° 10' | ± 0° 10' | ± 0° 15' | ± 0° 30' | | Over 400 | ± 0° 5' | ± 0° 5' | ± 0° 10' | ± 0° 20' | iso 2768 medium tolerance
| | Permissible Deviation (±) | |---------------------|-------------------------------| | Up to 10 mm length of shorter side | ±1° | | >10 to 50 mm | ±0°30' (30 arcminutes) | | >50 to 120 mm | ±0°20' (20 arcminutes) | | >120 to 400 mm | ±0°10' (10 arcminutes) | | >400 mm | ±0°5' (5 arcminutes) | The ISO 2768 standard, published by the International
Below is a comprehensive reference guide. This includes the official tolerance tables, explanations of tolerance classes, and practical application notes. This text is designed to be printed or saved as a document for your reference. This includes the official tolerance tables, explanations of
It is a default tolerance standard used when individual tolerances are specified on a drawing. The "Medium" (m) class is the most common choice for typical machined parts, offering a balance between precision and cost.