Asymmetry in the height distribution is specified by the sampling length and is referred to as Rsk, or skewness of the assessed profile. As it provides details on the morphology of the surface texture, this parameter is significant. Positive values are obtained on surfaces with pores and scratches, while negative values are found on surfaces with high peaks spread out on a regular surface (distribution skewed towards the bottom) (distribution skewed towards the top). Therefore, when contact or lubrication functions are required, it is fascinating. Contrary to Ra, this property does not provide any information regarding the profile’s exact height.

Rku, or kurtosis, refers to the sharpness of the height distribution as determined by the sampling length for the evaluated profile.

Rc, the mean height of the profile elements, is based on the evaluation length. The surface with texture cells or grains can be used to determine this parameter. Given that it resembles the motif parameter R mentioned in ISO 12085, it should be regarded as a feature parameter (see ISO 25178).

To sum up NextGen’s NG-SR400-T System Surface Roughness Tester can display Rsk, Rku & Rc Amplitude Parameters.

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