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Flange nuts have a washered base in order to ensure fasteners remain firmly secure. The washered base helps to spread pressure to a larger surface area, ensuring a secure fit.

Serrated Hex Flange Nut - 5/8-11 - Zinc CR+3 - Case Hardened Steel - UNC - Pkg of 50 - BBI 857380

857380-serrated-hex-flange-nut-5-8-11-zinc-case-hardened-steel-unc-pkg-of-50

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