ISO 21920-3 is Part 3 of the ISO 21920 series on surface texture by profile methods within geometrical product specifications (GPS). It specifies the complete specification operator for surface texture by profile methods.
In GPS terms, the specification operator is the full set of conditions that defines how a surface texture requirement is to be evaluated. This part is therefore read together with ISO 21920-2, which defines the terms and profile parameters themselves. Drawing authors and inspectors use it to make sure a measurement follows the same conditions the designer intended. ISO lists the 2021 edition as due for revision, so check for a newer edition before setting up a procedure.
Profile measurements to these operators are made with a profile instrument such as a stylus roughness tester. Our surface roughness testers are used for profile surface texture measurement to ISO 21920-3. If you need help matching ISO 21920-3 requirements to your parts or setup, contact our team.
