1/4-20 x 3/4 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (4

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

Hex Lag Screws are manufactured from low carbon steel to meet SAE J429 Grade 1

1-8 x 8 Grade 8 Hex Cap Screw Yellow Zinc Plated

17/32 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

4-40 x 3/8 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10,000) 1-8 Hex Cap Screws 316 Stainless Steel 1/4-20 x 3/4 Phillips Flat4 40 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.