316 stainless steel is recommended where superior corrosion resistance is needed

1-8 x 2 1/2 Flat Socket Cap Screw Alloy

1/4-20 x 4 Grade 8 Hex Cap Screw Plain Domestic USA (450)

1/4-28 L9 Hex Nut Alloy Cadmium Yellow and Wax Coated Domestic USA (100)

5/16-24 x 4 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (300) M12-1.75 Socket Cap Screws 12.9 Alloy Plain DIN 912 316 stainless steel is recommended5 16 24 x 4 1 2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (300) . 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