1.1 This specification covers the chemical, mechanical, and dimensional requirements for hardened steel washers for use with fasteners having nominal thread diameters of ¼ through 4 in. These washers are intended for general-purpose mechanical and structural use with bolts, nuts, studs, and other internally and externally threaded fasteners. These washers are suitable for use with fasteners covered in Specifications A 325, A 354, A 449, and A 490
1.2 The washers are designated by type denoting the material and by style denoting the shape.
1.2.1 The types of washers covered are:
1.2.1.1 Type 18212;Carbon steel.
1.2.1.2 Type 38212;Weathering steel. Atmospheric corrosion resistance and weathering characteristics are comparable to that of steels covered in Specifications A 588
1.2.2 The styles of washers covered are:
1.2.2.1 Circular8212;Circular washers in nominal bolt sizes ¼ through 4 in. suitable for applications where sufficient space exists and angularity permits.
1.2.2.2 Beveled8212;Beveled washers are square or rectangular, in nominal sizes ½ through 1½ in., with a beveled 1 to 6 ratio surface for use with American standard beams and channels.
1.2.2.3 Clipped8212;Clipped washers are circular or beveled for use where space limitations necessitate that one side be clipped.
Note 18212;A complete metric companion to Specification F 436 has been developed—Specification F 436M; therefore no metric equivalents are presented in this specification.
1.2.2.4 Extra Thick8212;Extra thick washers are circular washers in nominal sizes ½ through 1½ in., with a nominal thickness of 5/16 in. suitable for structural applications with oversized holes.
1.3 Terms used in this specification are defined in Terminology F 1789
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