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

1/2-13 x 5 1/2 Socket Set Screw Cup Point Alloy

7/8-14 x 3 Hex Cap Screw SS 18-8 (A2)

1 9/32 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

5/8-11 x 1 1/2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (25)

1/4-20 x 4 Grade 8 Hex Cap Screw Plain Domestic USA (50) 5/8-11 Socket Cap Screws 18-8 Stainless Steel On diameters over 1 inch1 4 20 x 4 Grade 8 Hex Cap Screw Plain Domestic USA (50). Grade 8 Hex Cap Screws are manufactured in the USA 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