Din | Iso 13715

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

Often, a drawing will feature the symbol with no numerical value but simply a text note or implied condition. If the symbol points to the edge and has no number, it implies that the edge must be . It does not require a specific radius, but it forbids the protrusion of material. din iso 13715

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. The standard uses specific terms to describe the

For critical edges, use the symbol directly on the drawing next to the specific edge. Passing (+) Deviation outside the ideal shape (excess

Next time you issue a drawing, skip the "sharp edge" note. Grab the DIN ISO 13715 symbol instead. Your machinists (and your end users’ fingers) will thank you.