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The basis for the Rk parameters is the roughness profile that is gener­ated by filtering with the robust Gaussian filter in accordance with DIN EN ISO 16610-31.

A special regression line on the Abbott curve of the roughness pro­file splits the curve into three areas which are used to calculate the Rk parameters:

Core height Rk is the height of the core roughness profile.

Reduced peak height Rpk is the mean height of the peaks pro­trud­ing from the core roughness pro­file.

Reduced pit depth Rvk is the mean depth of the pits pro­trud­ing from the core roughness profile.

Rmrk1 and Rmrk2 (previously Mr1 and Mr2) designate the smallest and largest material ratios of the core roughness profile.