1 3/8-12 x 5 1/2 Socket Cap Screw Alloy

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12-24 x 1/2 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (7,000) Phillips Flat Undercut Machine Screws Black Zinc Plated 1 3/8-12 x 5 1/212 24 x 1 2 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (7,000) . Black Zinc is an acidic, low temperature powdered product developed to impart a black conversion coating of zinc die casting, galvanized stock and electroplated zinc parts. The black coating serves as a base for organic coatings (lacquers, paints, waxes and oils) and also provides an esthetic appeal.