The standard uses specific terms to describe the state of an edge relative to its ideal, "sharp" geometry: Definition External Edge Context Internal Edge Context Deviation inside the ideal shape (material removed). Permitted "edge break" or rounding. Required relief or clearance. Passing (+) Deviation outside the ideal shape (excess material). Permitted burr or flash. Permitted excess material. Sharp Edge Almost zero deviation from the ideal shape. No burr or rounding allowed. No excess or undercut allowed. The Symbol and Its Meanings INTERNATIONAL STANDARD ISO 13715
For critical edges, use the symbol directly on the drawing next to the specific edge.
![Example symbol structure: A triangle-like figure with a line pointing to the edge, plus a numeric value.] din iso 13715
Let’s look at how this looks in practice.
If you see a symbol pointing to an edge with a value of 0.5 and a minus sign ( - ), it reads as: The standard uses specific terms to describe the
In the drawing’s general notes, write the default: "Undefined edges according to DIN ISO 13715."
The current version is ISO 13715:2017 , which superseded the 2000 edition and is adopted in Germany as DIN EN ISO 13715 . Key Terminology Passing (+) Deviation outside the ideal shape (excess
DIN ISO 13715 uses a specific graphical symbol that looks somewhat like a checkmark or a flattened "x". It acts as a pointer to the edge in question.
If you have ever looked at a technical drawing and seen a small "x" or a checkmark near a corner and wondered what it meant, you have encountered .
