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

Our Grade 5 material meets or exceeds SAE J429 Grade 5 specifications

3/4-10 x 9 A307 Grade A Carriage Bolt Zinc Plated

1/2-13 x 12 Grade 5 Hex Cap Screw Zinc Plated

5/8-11 x 12 A307 Grade A Carriage Bolt Zinc Plated

1/2-13 x 10 Grade 5 Hex Cap Screw Zinc Plated 5/8-11 A307 Grade A Carriage Bolts Zinc Plated On diameters over 1 inch1 2 13 x 10 Grade 5 Hex Cap Screw Zinc Plated . Grade 5 Hex Cap Screws are manufactured from medium carbon steel. Our Grade 5 material meets or exceeds SAE J429 Grade 5 specifications. All products are manufactured with rolled threads. Zinc plated material meets or exceeds ASTM F1941. 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