A307 Grade A Carriage Bolts are manufactured from low carbon steel to meet or exceed ASTM A307 Grade A

Tensile strength on diameters 1/4 to 2 1/2 inches is a minimum of 150

7/8-14 x 4 Grade 5 Hex Cap Screw Zinc Plated

3/4-16 x 5 Grade 8 Hex Cap Screw Yellow Zinc Plated

1-14 x 5 1/2 Grade 5 Hex Cap Screw Zinc Plated

5/8-18 x 5 Grade 8 Hex Cap Screw Yellow Zinc Plated 7/8-14 Grade 5 Hex Cap Screws Zinc Plated A307 Grade A Carriage Bolts5 8 18 x 5 Grade 8 Hex Cap Screw Yellow Zinc Plated . Grade 8 Hex Cap Screws are manufactured 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 1 2 inches is