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5/16-18X2 1/2 Serrated Hex Flanged Washer indented U/C Full Thread Scr Case Hard Zinc Bake. Indented hex washer head offers advantages of hex head, plus greater protection to mating surface.

5/16-18 x 2-1/2 Serrated Hex Flanged Washer Ind. U/C Full Thread Scr Case Hard - Zinc500 pcs

5-16-18x2-1-2-serrated-hex-flanged-washer-indented-undercut-screws-3140MWW

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