| 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°).
If you have ever sent a 2D drawing to a machine shop and received a call asking, “How tight do you actually need this chamfer to be?” — you have experienced the gap between "design intent" and "manufacturing reality." iso 2768 angular tolerance
(Note: ′ = minutes of arc. 60′ = 1 degree.) | Class | Code | Typical Application |