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.
Chemical Requirements
| Composition, % | ||
| Element | Type 1 | Type 3B |
| Phosphorus, max | ||
| Heat analysis | 0.040 | 0.040 |
| Product analysis | 0.050 | 0.045 |
| Sulfur, max | ||
| Heat analysis | 0.050 | 0.050 |
| Product analysis | 0.060 | 0.055 |
| Silicon | ||
| Heat analysis | 0.15-0.35 | |
| Product analysis | 0.13-0.37 | |
| Chromium | ||
| Heat analysis | 0.45-0.65 | |
| Product analysis | 0.42-0.68 | |
| Nickel | ||
| Heat analysis | 0.25-0.45 | |
| Product analysis | 0.22-0.48 | |
| Copper | ||
| Heat analysis | 0.25-0.45 | |
| Product analysis | 0.22-0.48 | |
AWhen providing Weathering Steels to a calculated corrosion index use the Legault-Leckie formula from Guide G101.
Link to online calculator: http://www.astm.org/COMMIT/G01_G101Calcultr1100.xls
+ 1.49 (% Si) + 17.28 (% P) - 7.29 (% Cu) (% Ni)
- 9.10 (% Ni) (% P) - 33.39 (% Cu)2
B Weathering steel washers may also be manufactured from any of the steels listed in Table 2 of Specification A588/A588M and F3125.
Washer Dimensional Tolerances
| Dimensional Characteristics | <1 in. Nominal Size |
1 through 1 1⁄2 in. Nominal Size |
>1 1⁄2 through 3 in. Nominal Size |
>3 in. Nominal Size |
| Flatness: max deviation from straightedge placed on cut side shall not exceed (in.) | 0.010 | 0.015 | 0.020 | 0.032 |
| Concentricity, in.: center of hole to outside diameter | 0.030 FIRA | 0.060 FIRA | 0.090 FIRA | 0.250 FIRA |
| Burr shall not project above immediately adjacent washer surface more than (in.) | 0.010 | 0.015 | 0.020 | 0.025 |
AFull indicator reading.