Hardness: Rockwell hardness ranges from B68 to C32

7/8-14 x 4 1/2 Grade 8 Hex Cap Screw Plain Domestic USA (40)

7/8-9 x 4 1/4 Grade 5 Hex Cap Screw Zinc Plated

Commonly used in naval construction and power plant applications

9/16-12 x 6 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25) 1/2-20 Hex Cap Screws 18-8 Stainless Steel Hardness: Rockwell hardness ranges from9 16 12 x 6 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25) . 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