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

Here is what the symbols mean:

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.

Let’s break down what it is, why it matters, and how to read its symbols. Officially titled "Technical product documentation — Indications for undefined edges," DIN ISO 13715 specifies how to indicate the permissible condition of edges that are not explicitly dimensioned elsewhere on the drawing.

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

Enter . This standard is the universal language for defining the condition of undefined edges on technical drawings.

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.

Simply put: It tells the machinist how to treat the "leftover" edges—those small intersections between two surfaces where no specific radius or chamfer is called out.

Din Iso 13715 [better] ✪

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

Here is what the symbols mean:

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. din iso 13715

Let’s break down what it is, why it matters, and how to read its symbols. Officially titled "Technical product documentation — Indications for undefined edges," DIN ISO 13715 specifies how to indicate the permissible condition of edges that are not explicitly dimensioned elsewhere on the drawing.

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

Enter . This standard is the universal language for defining the condition of undefined edges on technical drawings.

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. Disclaimer: This post is for informational purposes

Simply put: It tells the machinist how to treat the "leftover" edges—those small intersections between two surfaces where no specific radius or chamfer is called out.