Zeron Fastners
ASTM A325 Washers
ASTM A325 Washers refers to the hardened flat washers required for use with ASTM A325 structural bolts. These washers must meet the separate ASTM F436 specification for structural washers, ensuring they are strong enough to withstand the high clamping forces of the A325 assembly without deforming. F436 washers are crucial for three reasons: they distribute the high stress load evenly, they prevent surface damage under the bolt head or nut during tightening, and they compensate for non-parallel surfaces in the structural connection. Zeron Fastners supplies F436 washers, which complete the high-strength A325 structural bolting assembly for bridges, steel structures, and heavy machinery.
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ASTM F436 Structural Washers Chemical Composition (for A325 Assemblies)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.25 – 0.48 |
| Manganese (Mn) | 0.40 min |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.050 max |
| Silicon (Si) | 0.15 – 0.35 |
ASTM F436 Structural Washers Mechanical Properties
| Property | Requirements (min) |
|---|---|
| Through Hardness (Rockwell) | 38 – 45 HRC |
| Proof Load / Strength | High Strength, Required to match A325 |
| Flatness | Specified Tolerance |
| Thickness | Specified Tolerance |