ASTM F436M type 3 is a standard material and dimensional specification for
weathering steel washers, intended for general-purpose mechanical and structural
use with bolts, nuts, studs, and other internally and externally threaded
fasteners. Find chemical, mechanical and dimensional requirements for type 3
weathering steel washers for use with fasteners having nominal thread diameters
of M12 through M100. Boltport manufactures and stocks full range of type 3
weathering steel washers to ASTM F436M specification.
Chemical Composition [Note A]
| Elements |
Composition, % |
| Type 3 [Note B] |
| Phosphorus, max |
Heat |
0.040 |
| Product |
0.045 |
| Sulfur, max |
Heat |
0.050 |
| Product |
0.055 |
| Silicon |
Heat |
0.15 - 0.35 |
| Product |
0.13 - 0.37 |
| Chromium |
Heat |
0.45 - 0.65 |
| Product |
0.42 - 0.68 |
| Nickel |
Heat |
0.25 - 0.45 |
| Product |
0.22 - 0.48 |
| Copper |
Heat |
0.25 - 0.45 |
| Product |
0.22 - 0.48 |
Mechanical Properties [Hardness Requirement]
| Surface |
Quenched and Tempered |
Carburized |
| Plain |
38 - 45 HRC |
69 - 73 HRA |
| Hot Dip Galvanized |
26 - 45 HRC |
| Mechanical Galvanized |
38 - 45 HRC |
Washer Marking
| Grade |
Identification Marking |
| Type 3 |
"F436M 3" |