On diameters over 1 inch to 1 1/2 hardness will range from HRC 19-30

5 x 90 Hex Cap Screw 8

we pride ourselves on offering a vast selection of all the fasteners anyone could need for a project — including hard-to-find fastening solutions

1-8 x 6 A307A Hex Tap Bolt Zinc Plated

6-32 x 1/2 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10,000) Wall Dog Light Duty Anchors - Phillips Oval On diameters over 1 inch6 32 x 1 2 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.