The high strength

1-8 x 12 Grade 5 Hex Cap Screw Zinc Plated

5/8-18 x 6 Grade 8 Hex Cap Screw Yellow Zinc Plated

2-4 1/2 x 3 1/2 Socket Cap Screw Alloy

3/16 x 4 Mushroom Spike Zinc Plated (100)

6-32 x 3/8 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10,000) 3/4-10 Hex Cap Screws 18-8 Stainless Steel The high strength6 32 x 3 8 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10,000) . 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.