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

Zinc plating meets ASTM B-117 for salt spray corrosion

1/2 x 12 High Speed Long Boy

1-8 x 7 Hex Cap Screw SS 316 (A4)

5/8-18 x 5 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) 5/8-11 Socket Cap Screws 316 Stainless Steel A307 Grade A Carriage Bolts5 8 18 x 5 1 2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) . Grade 8 Hex Cap Screws are manufactured in the USA 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