F436 Structural Flat Washer with Hot-Dipped Galvanized Plating

F436 Structural Flat Washers for Steel-to-Steel Connections

F436 structural flat washers are engineered for heavy-duty performance in critical steel-to-steel assemblies where strength, reliability, and code compliance are essential. Designed specifically for structural bolting applications, these hardened washers provide superior load distribution, prevent surface embedding, and maintain consistent clamping force under extreme pressure.

Built for High-Load Structural Applications

Through-Hardened Carbon and Alloy Steel

Manufactured from medium carbon steel or alloy steel, F436 washers are fully heat-treated to achieve precise mechanical properties. The thru-hardening process ensures uniform hardness throughout the washer, increasing resistance to deformation, crushing, and wear under high preload conditions.

Engineered for Structural Bolt Compatibility

F436 structural washers are commonly paired with ASTM A325 and A490 structural bolts, as well as SAE J429 Grade 8 fasteners. This compatibility ensures secure, code-compliant connections in bridges, commercial buildings, wind towers, and heavy steel fabrication projects.

Specifications and Performance Standards

Mechanical Properties

These structural flat washers typically feature a Rockwell hardness of 38–45 HRC, providing excellent resistance to galling and embedding. Their increased thickness—greater than standard flat washers—allows them to withstand high clamping forces without distortion.

Dimensions and Tolerances

Available in standard sizes from 1/2" to 1-1/2" inner diameters and larger upon request, F436 washers are manufactured with tight dimensional tolerances to ensure proper bolt alignment and optimal joint performance.

Material and Coating Options

F436 washers are offered in multiple finishes to match environmental requirements:

• Plain (uncoated) for controlled indoor use

• Hot-Dip Galvanized for superior corrosion resistance in outdoor and structural steel applications

• Zinc-Plated (Clear Zinc Cr3) for light corrosion protection in mildly corrosive environments

Trusted in Infrastructure and Heavy Industry

F436 structural flat washers are widely used in steel-to-steel structural connections, heavy equipment assembly, bridges, high-rise buildings, wind energy systems, and infrastructure projects. When strength, durability, and ASTM compliance matter most, F436 structural washers deliver dependable performance in the most demanding structural environments.