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

45/64 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

3/4-16 x 7 1/2 Hex Cap Screw SS 18-8 (A2)

1/2-13 x 8 1/2 Socket Cap Screw Alloy

8 x 2 1/2 Phillips Bugle Decking Screws W

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.