F436M Flat Washer
M16-M30
F436M Flat Washer is a metric hardened steel washer conforming to ASTM F436M, designed for use with high-strength structural bolts such as A325M and A490M. It provides a hardened bearing surface to distribute bolt preload evenly and prevent indentation under high clamping forces. These washers are available in plain, zinc-coated, and Type 3 (weathering steel) finishes, and are commonly used in steel bridges, buildings, and industrial structures.
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Product Name：F436M Flat Washer
Our F436M Flat Washer is a metric hardened steel washer conforming to ASTM F436M, designed specifically for use with high-strength metric structural bolts such as A325M and A490M. The ASTM F436M Washer features 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 F436M Hardened Metric Flat Washers, they are available in plain finish, zinc-coated, and Type 3 (weathering steel for atmospheric corrosion resistance). These washers are widely used in steel bridge construction, high-rise buildings, industrial plants, heavy machinery, and wind towers. F436M washers are typically supplied with a slightly chamfered outer edge and a burr-free bearing surface, matching metric bolt diameters from M12 to M36.
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