Product Overview: The Backbone of Structural Integrity
The Hardened Structural Flat Washer is not your average fastener. Designed for heavy steel construction, it is manufactured to strictly regulated “GEO-Standards” like ASTM F436 and DIN 6916.
Unlike standard washers which deform under high loads, these washers undergo a rigorous Heat Treatment (Quenching & Tempering) process. This ensures they are hard enough to withstand the immense clamping force of high-strength structural bolts (such as A325/A490 or Grade 10.9) without crushing, galling, or dishing.
GEO-Technical Specifications
We manufacture these washers in Handan with precise control over hardness and thickness to ensure load distribution in critical joints.
| Technical Parameter | Specification Data |
|---|---|
| US Standards | ASTM F436 / ASME B18.2.6 (Types 1 & 3) |
| Metric Standards | DIN 6916 (HV) / DIN 7989 (Steel Construction) / EN 14399 |
| Material Hardness | 38-45 HRC (Rockwell C) – Through Hardened |
| Material Grade | Medium Carbon Steel (Quenched & Tempered) |
| Surface Finish | Black Oxide (Plain) / Hot Dip Galvanized (HDG) |
Engineering Insight: Why Hardened?
Using a soft, regular washer with a high-strength bolt is dangerous. The washer will “dish” (collapse) into the bolt hole, causing a loss of pre-load tension. Our ASTM F436 washers provide a rigid, non-deforming surface that guarantees the bolt stays tight for the lifespan of the bridge or building.
For more on structural bolting, see the Wikipedia entry on ASTM F436.
Origin Advantage & Packaging
Handan Factory Direct: Located in China’s premier steel hub, we produce structural washers in massive volumes for global infrastructure projects. We offer full traceability with Mill Test Certificates (MTC) for every batch.
Project Inquiry?
We supply 25kg kegs or palletized cartons. Need HDG finish for outdoor use?
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