scope:

GENERAL

This standard is concerned with the geometric irregularities of surfaces of solid mate· rials, physical specimens for gaging roughness, and the characteristics of instrumentation for measuring roughness, It establishes definite classifications for roughness, waviness, lay, and a set of symbols for drawings, specifications, and reports; In order to assure a uniform basis for measurement, it also provides specifications · for Precision Reference Specimens, Roughness Comparison Specimens, and establishes requirements for Tracer Type instruments, This standard i.s not concerned with luster, appearance, color, corrosion resistance, wear resistance, hardness, micro-structure, and many other characteristics which may be governing considerations in specific applications.

This standard does not define the degrees of surface roughness and waviness or type of lay suitable for specific purposes, nor does it specify the means by which any degree of such irregularities may be obtained or produced. however, criteria for selection of surface qualities and in formation on instrument techniques and methods of producing, controlling and inspecting surfaces are included in Appendixes A, F3, C and D, which are not an integral part of this standard.

Surfaces, in general, are very complex in character. This standard deals only wit-h the height, width, and direction of surface irregularities, since these are of practical importance in specific applications.