Grade 5 Carriage Bolts are manufactured from medium carbon steel

3/4-16 x 6 1/2 Socket Cap Screw Alloy

7/16-20 x 6 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25)

7/8-14 x 6 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated

3/8 x 3 1/2 Round Split Drive Anchor Zinc Plated (25)

5/8-11 x 1 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25) 5/8 Hex Lag Screws Zinc Plated Grade 5 Carriage Bolts are5 8 11 x 1 1 2 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