hardness will range from HRC 31-39

1-14 x 3 Grade 5 Hex Cap Screw Zinc Plated

3/4-10 x 7 Grade 8 Hex Cap Screw Yellow Zinc Plated

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

3/4-16 x 5 Grade 5 Hex Cap Screw Zinc Plated

7/8-9 x 3 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated 7/8-9 Grade 5 Hex Cap Screws Zinc Plated hardness will range from HRC7 8 9 x 3 1 2 Grade 8 Hex Cap Screw Yellow Zinc Plated . Grade 8 Hex Cap Screws are manufactured from medium carbon alloy steel. In diameters 1 4 to 1 1 2 inches our Grade 8 material meets or exceeds SAE J429 Grade 8 specifications. Diameters over 1 1 2 inches meet or exceed ASTM A354 Grade BD. All material is manufactured with rolled threads. Yellow zinc plated bolting will meet or exceed ASTM F1941. Typical hardness on diameters 1 4 to 2 1 2 inches