reunalaatu

Reunalaatu is a Finnish term used in manufacturing and product design to describe the quality of an object's edge. It covers how clean and finished the edge is, including the presence or absence of burrs, the geometry of the edge (radius, chamfer, or bevel), and the smoothness of adjacent surfaces. The concept is applied across metal, plastic, wood, and composite components.

Assessment of reunalaatu typically combines visual and tactile inspection with critical measurements. Common criteria include burr height and length, edge radii or chamfer dimensions, and the roughness of the edge zone. Measurement methods can involve calipers, profilometers, optical or laser measurement, and standardized checklists to determine pass/fail status.

Reunalaatu matters for safety, assembly fit, sealing integrity, and aesthetics. Poor edge quality can cause cut hazards, cause misalignment in assemblies, or lead to premature wear. In many industries, edge finishing processes such as deburring, grinding, or chamfering are integral parts of production, and reunalaatu is a key acceptance criterion.

Although the term is rooted in Finnish practice, similar concepts exist in international quality standards describing edge geometry and deburring. Companies often adopt internal specifications or reference applicable industry standards to define acceptable edge quality, including tolerances for burrs, radii, and surface finish in the edge zone.