These AN flat washers by Pro-Werks are part of our specialty fasteners selection, made of non-hardened steel and are cadmium plated (gold in color).

AN washers have a smaller outside diameter than flat washers that are commonly found in many industrial applications.

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What are the purpose of AN Washers?

Their primary purpose in the aircraft industry is to provide a smooth bearing surface under a hex nut allowing for index alignment of cotter pin holes or as shims to obtain the proper grip length needed on the fastener.

AN Washers are also preffered by performance minded builders. These Mil Spec washers are ideal for applications where space availability is limited, and to save weight on a final assembly.