Indicates a required undercut or rounding. Material must be removed. This effectively acts as a dimension for a chamfer or radius, simplifying the drawing by not requiring a detailed view for minor edge breaking.
Rough, sharp, or overhanging material sticking out beyond the ideal geometry. iso13715
: Means a positive burr is allowed, up to a maximum height of Indicates a required undercut or rounding
The standard applies to edges where the exact geometric form is not defined by other dimensions. It categorizes the state of an edge into three distinct conditions based on the material disposition relative to the theoretical ideal edge: Rough, sharp, or overhanging material sticking out beyond
An "undefined edge" (also known as a burred edge or non-specific edge) is an edge of a part that has not been specifically machined to a precise radius or chamfer. It is the raw result of a cutting, forming, or casting process. These edges can have two main features: