This paper presents a regression analysis of the relationship between values of profile and areal surface texture parameters extracted from the same surfaces. The problem of tolerancing for areal surface texture evaluation is briefly introduced. Basic concepts of and differences between areal and profile evaluation are discussed. Measurements of 21 samples of diverse origin are used as data for linear regression of dependencies of areal surface texture parameters Sa, Sq and Sz on their roughness profile equivalents Ra, Rq and Rz. Recommendations for calculation of areal surface texture parameter’s tolerance values are discussed based on the results of the analysis. The resulting regression equations provide a fast method for selection of areal surface texture tolerance values based on previous experience with profile parameters.
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