| 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′ |

The standard provides a table of . The Short Version (Angular Tolerance Table) For Shorter leg length up to the specified range, here are the rough equivalents (always consult the official standard for production):

Disclaimer: Always refer to the latest official ISO 2768-2 standard for exact tables and regulatory requirements before production.

Instead, the permissible deviation is calculated based on the length of the shorter leg of the angle. Why? Because a 0.1mm gap at the tip of a 5mm corner is massive. The same 0.1mm gap at the tip of a 500mm beam is negligible.

| 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°).

This is where saves the day. Specifically, its rules for angular tolerances.