Unhardened Plain, Flat Washers used to provide increased bearing surface spacing and to prevent galling
ASTM F844 Specification covers round and miscellaneous shape steel plain (flat) washers furnished in an unhardened condition used to provide increased bearing surface spacing and to prevent galling. Unless otherwise specified, the washers are furnished with dimensions conforming to B18.22.1, Type A, Tables 1A and Tables 1B. Hardened washers for use with heat-treated structural bolts are covered by Specifications F436 and F436M. 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.
| Outside Diameter, inches | Out of Flat, inches, maximum |
|---|---|
| 0.500 and less | 0.007 |
| 0.5625 through 1.250 | 0.010 |
| over 1.250 | 0.015 |
Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.