1 3/8-6 x 14 Socket Cap Screw Alloy

3/16 x 18 High Speed Aircraft Bit

#6 Heavy Duty Drill Bit - Stubby Length

Fully assembled nut

1/4-20 x 1/2 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (5,000) A194 2H Heavy Hex Nuts Hot Dipped Galvanized 1 3/8-6 x 14 Socket1 4 20 x 1 2 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (5,000) . 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.