1.1 This specification covers the chemical, mechanical, and dimensional requirements for hardened steel washers for use with fasteners having nominal thread diameters of 1/4 through 4 in. and M12 through M100. 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 A354, A449, A563, A563M, F959/F959M, and F3125.
1.2 The washers are designated by type denoting the material, by style denoting the shape, and by inch or metric dimensions.
1.2.1 The types of washers covered are:
1.2.1.1 Type 1—Carbon steel.
1.2.1.2 Type 3—Weathering steel.
1.2.1.3 This specification provides for furnishing Type 3 to chemical composition or a Corrosion Index (CRI) of 6 or higher at the suppliers option.
1.2.2 The styles of washers covered are:
1.2.2.1 Circular—Circular washers in nominal sizes 1/4 through 4 in. and M12 through M100 suitable for applications where sufficient space exists and angularity permits.
1.2.2.2 Beveled—Beveled washers are square or rectangular, in nominal sizes 1/2 through 11/2 in., M12 through M16, with a beveled 1 to 6 ratio surface for use with American standard beams and channels.
1.2.2.3 Clipped—Clipped washers are circular or beveled for use where space limitations necessitate that one side be clipped.
1.2.2.4 Extra Thick—Extra thick washers are circular washers in nominal sizes 1/2 through 4 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 F1789 unless otherwise defined herein.
1.4 The values stated in either inch-pound units for inch fasteners and SI units f
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