Din Iso 13715 [patched] May 2026

For sharp edges that must cut (e.g., cutting tools, scrapers), write: "Edge max R 0.05" or "Sharp edge permitted – handle with care" (though the latter is rare in modern standards). The Most Common Mistake Do not write: "Break all sharp edges." This is subjective. Does "break" mean 0.1 mm or 1.0 mm? It depends on who is reading.

In the world of precision manufacturing, assuming an edge is sharp can lead to burrs, injuries, and assembly issues. Conversely, assuming an edge is broken (chamfered or rounded) without a specification can lead to unnecessary machining costs.

Here is what the symbols mean:

![Example symbol structure: A triangle-like figure with a line pointing to the edge, plus a numeric value.]

Disclaimer: This post is for informational purposes. Always refer to the latest official DIN ISO 13715 standard document for absolute compliance.