scope:

13.1 SCOPE

13.1.1 Purpose. This section establishes the method of specifying geometric characteristics of surface irregularities with respect to their height, width, and direction. It provides, through the use of symbols and numerical value classifications, a uniform system for accurately expressing the desired surface requirements (roughness, waviness, contact area, and lay) of solid materials on drawings. Surfaces normally excluded from these requirements are those which are controlled by their manufacturing process and are usually acceptable for most applications, i.e., textile, rubber, optical glass, plastics, felt, sheet metal, tubing, etc.