TS EN ISO 13715

TS EN ISO 13715 is a technical product documentation standard for indicating and dimensioning edges whose exact geometry is not fully defined on the drawing. It gives a common way to communicate what matters at the edge when the designer does not prescribe a fully formed chamfer or radius, helping drawings remain clear and consistent across design, manufacture, and inspection.

Why undefined edges need a dedicated notation

In general engineering documentation, an edge is not always described as a fully defined geometric feature such as 1 × 45°. In many components, especially machined parts, sheet-metal items, or cast parts, the practical concern is the allowable edge condition: burr, break, rounding, protrusion, or similar deviation from the nominal boundary. This standard specifies the rules for indicating such undefined edges and also the proportions and dimensions of the graphical symbols used, so the notation remains legible and consistent from one drawing to another.

How it relates to general dimensioning practice

When a geometrically defined edge is required, for example a conventional chamfer dimension such as 1 × 45°, the general dimensioning principles of ISO 129-1 apply. TS EN ISO 13715 therefore does not replace ordinary dimensioning for defined features; instead, it provides a dedicated framework for edges that are intentionally left geometrically open in the documentation. In practice, that distinction helps avoid ambiguity about whether the requirement concerns a precise machined form or simply the permitted condition of the edge.

• Indication of edges of undefined shape in technical drawings
• Proportions and dimensions of the graphical symbols used
• Communication of permitted edge conditions such as burrs or edge breaks
• Reference to ISO 129-1 for geometrically defined edges