(Note: ′ = minutes of arc. 60′ = 1 degree.)
Disclaimer: Always refer to the latest official ISO 2768-2 standard for exact tables and regulatory requirements before production. iso 2768 angular tolerance
For general tolerancing, ISO 2768-1 (for linear dimensions) gets all the attention. But its lesser-discussed sibling, , handles features like angles, chamfers, and tapers. Ignoring it is a fast track to rejected parts or inflated machining costs. (Note: ′ = minutes of arc
| Nominal Length of Shorter Side (mm) | Tolerance Class f (Fine) | Tolerance Class m (Medium) | Tolerance Class c (Coarse) | Tolerance Class v (Very Coarse) | | :--- | :--- | :--- | :--- | :--- | | 0 – 10 | ± 30′ | ± 1° | ± 1° 30′ | ± 3° | | 10 – 50 | ± 20′ | ± 40′ | ± 1° | ± 2° | | 50 – 120 | ± 10′ | ± 20′ | ± 30′ | ± 1° | | 120 – 400 | ± 5′ | ± 10′ | ± 15′ | ± 30′ | | > 400 | ± 2′ | ± 5′ | ± 10′ | ± 20′ | But its lesser-discussed sibling, , handles features like
This is where saves the day. Specifically, its rules for angular tolerances.
| Class | Code | Typical Application | | :--- | :--- | :--- | | | f | Precision instruments, tight assemblies | | Medium | m | General machining (most common default) | | Coarse | c | Fabrication, welded structures | | Very Coarse | v | Sheet metal, rough castings | The Catch: It Depends on Leg Length Here is the most misunderstood aspect of ISO 2768 angular tolerances: The tolerance is not a fixed angle (e.g., ±1°).
