The zinc body consists of a die cast zinc alloy

7/8-9 x 3 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated

7/8-14 x 4 1/2 Socket Cap Screw Alloy

5/16-18 x 7/8 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100)

1/4-20 x 1/2 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (5

5/16-18 x 4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (50) 7/16-20 Flat Socket Cap Screws Alloy The zinc body consists of5 16 18 x 4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (50) . Grade 5 Hex Cap Screws are manufactured in the USA from medium carbon steel. Our Grade 5 material meets or exceeds SAE J429 Grade 5 specifications. All products are manufactured with rolled threads. Typical hardness on diameters 1 4 to 1 inch is HRC 25 34. On diameters over 1 inch to 1 1 2 hardness will range from HRC 19 30. Tensile strength for diameters 1 4 to 1 inch is a minimum of