Surface roughness and contour metrology

Surface texture measurement according to ISO 21290 series of standards

by HOMMEL ETAMIC

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The texture of a surface is an important factor in ensuring high quality parts. To achieve this, it is essential that it is precisely defined by means of standardized surface texture parameters. The ISO 21920 series of standards has been in force since 2022 and defines the parameters of roughness metrology more clearly. Parameters are mainly calculated directly for the entire evaluation length. In addition to the known roughness parameters new ones have been defined and some existing parameters have been given new names. This sometimes results in differences between the old parameters according to ISO 4287 or ISO 13565 and new parameters according to ISO 21920. The latter will replace the previous roughness metrology standards after a transition period. Specifications according to ISO 21920 The ISO 21920 series of standards precisely defines revised terms, guidelines, and parameters for effective surface evaluation, such as Surface profiles P, R and W parameters Traverse and evaluation lengths Filter types Measurement conditions Tolerance limits and acceptance rules Drawing entries back to top