Iso13715 May 2026

If you’ve ever seen cryptic symbols next to a 45° chamfer or a sharp edge on a drawing and wondered what they mean, this guide is for you. ISO 13715: Technical product documentation — Indications of undefined edges is an international standard that defines the rules for indicating the state of edges that are not explicitly dimensioned in a technical drawing.

In simple terms: It tells the manufacturer what to do with the edges of a part—whether to leave them sharp, break them with a chamfer, or round them—without cluttering the drawing with redundant dimensions. iso13715

The standard was previously known as , with the latest revision being ISO 13715:2017 . Why Do We Need It? Without ISO 13715, engineers would have to individually dimension every single edge on a complex part. Imagine a bracket with 50 edges—each requiring a "0.5 x 45°" callout. This is not only time-consuming but also makes drawings unreadable. If you’ve ever seen cryptic symbols next to