5/16-18 x 1 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100)

5/16-24 x 2 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100)

1-8 x 3 Grade 5 Hex Cap Screw Plain Domestic USA (40)

Hardness for plain and zinc plated washers is HRC 38-45 and HRC 26-45 for hot-dip galvanized washers per ASTM F436

1/2-20 x 2 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (225) 7/8-9 Grade 8 Hex Cap Screws Yellow Zinc Plated 5/16-18 x 1 1/2 Grade1 2 20 x 2 1 2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (225) . 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