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ASTM F844 Technical Data

Technical Data: ASTM F844 Scope ASTM F844 Materials and Manufacture ASTM F844 Chemical Composition ASTM F844 Mechanical Properties ASTM F844 Dimensions, Mass, and Permissible Variations

1.1 This specification covers round and miscellaneous shape steel plain (flat) washers furnished in an unhardened condition.
1.2 The washers are intended for general use bolt, nut, and stud applications to provide increased bearing surface, spacing, and to prevent galling.
1.3 Unless otherwise specified, the washers are furnished with dimensions conforming to B18.22.1, Type A, Tables 1A and Tables 1B.

4.1 Material—The washers shall be punched from hot-rolled, hot-rolled and pickled, or cold-rolled steel; or shall be machined from bar stock or tubing; or shall be forged at the manufacturer’s option. 5.1.1 The washers shall be steel, and unless otherwise specified, shall have no specified chemical composition requirements. 6.1 Unless otherwise specified, the washers are not furnished to mechanical requirements. 7.1 Standard Dimensions—Unless otherwise specified, the dimension shall be in accordance with B18.22.1, Tables 1A and Tables 1B for Type A washers. Where narrow (N) and wide (W) washers are provided for, the narrow type shall be furnished unless otherwise specified.
7.2 Non-Standard Dimensions—Other washers covered by this specification are generally referred to as US standard washers, SAE washers, light steel washers, riveting washers, fender washers, machinery bushing washers, machine screw washers, and similar designations. When specified, washers shall be furnished to these standards or shall be manufactured to the purchasers drawing requirements.
7.3 Parallelism—Washer faces shall be parallel within 0.005 in.
7.4.1 Washer faces shall be flat within the following requirements:

Outside Diameters, inches		Out of Flat, inches, maximum

0.500 and less		0.007
0.5625 through 1.250		0.010
over 1.250		0.015