This SAE Part Standard covers selected inch dimensioned washers and lock washers manufactured in accordance with American Society for Mechanical Engineers dimensional standards. This SAE standard covers material most often used in ship systems and equipment but its use may be applied wherever washers of the covered materials are used. This standard permits the washers to be identified and ordered by a part of identifying number (PIN) as defined in this standard.

The purpose of this document is to assist the designer and other personnel in providing requirements and part or identifying numbers for the most commonly used washers and lock washers. A part or identification number (PIN) is normally required for all military applications and provides a useful means of communicating washer and lock washer requirements to suppliers and manufacturers in a very succinct manner.