Typical hardness on diameters of 1/4 to 1 inch is HRC 25-34

3/4-10 x 8 Hex Cap Screw SS 316 (A4)

7/8-9 x 4 1/4 Hex Cap Screw SS 18-8 (A2)

7/16-14 x 7/8 Grade 5 Hex Cap Screw Plain Domestic USA (700)

#55 Heavy Duty Drill Bit - Stubby Length

5/16-18 x 5/8 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100) 1-8 Grade 5 Hex Cap Screws Zinc Plated Typical hardness on diameters of5 16 18 x 5 8 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (100) . 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