Nuts are made from a low-carbon steel which conforms to the following chemical composition requirements: Carbon-0

1 3/8-12 x 6 1/2 Socket Cap Screw Alloy

1 3/4-5 x 14 Socket Cap Screw Alloy

1 1/2 x 17 ITM SDS Max X-Cutter Hammer Drill Bit

4-40 x 5/16 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10,000) Nylon Insert Locknuts Zinc Plated Nuts are made from a4 40 x 5 16 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.