Structural Washer — ASTM F436 Hardened
ASTM F436 hardened structural washers are designed for use with A325 and A490 high-strength structural bolts. The hardened steel resists the high preloads and prevents the washer from being crushed or impressed by the bolt head/nut.
Specifications
| Standard | ASTM F436 (Type 1 plain, Type 3 weathering) |
|---|---|
| Hardness | 38-45 HRC |
| Size Range | 1/2" – 1-1/2" |
| Surface Finish | Plain, HDG |
| Documentation | Mill Test Certificate per heat lot |
Frequently Asked Questions
Are F436 washers required with A325 bolts?
Per AISC and most structural specifications, F436 washers are required at slip-critical connections, oversized or slotted holes, and other specific conditions. Even where not strictly required, they are widely specified for any A325/A490 connection because of their reliability.
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