F436 Flat Washer
1/2''~1-1/4''
F436 Flat Washer is an inch-series hardened steel washer conforming to ASTM F436, designed for use with high-strength structural bolts such as ASTM A325 and A490. It features a hardened surface to distribute load evenly and prevent indentation under high preload. These washers are available in plain, zinc-coated, and weathering steel (Type 3) finishes, and are commonly used in steel bridges, buildings, and industrial structures.
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Product Name：F436 Flat Washer
Our F436 Flat Washer is an inch-series hardened steel washer conforming to ASTM F436, designed specifically for use with high-strength structural bolts such as ASTM A325 and A490. The F436 Hardened Washers feature a through-hardened surface (typically 38 to 45 HRC) to distribute bolt preload evenly and prevent indentation or crushing of connected materials under high clamping forces. As a Structural Flat Washer F436, it is widely used in steel bridge construction, high-rise buildings, industrial plants, heavy machinery, and wind towers. These washers are available in plain finish, zinc-coated, and Type 3 (weathering steel for atmospheric corrosion resistance). F436 washers are typically supplied with a slightly chamfered outer edge and a burr-free bearing surface.
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