Carriage Bolt s Industrial & Scientific 5/16-18 X 3/4-Inch 100-Piece Black Carriage Bolts Aazon.co: Hard-to-Find Fastener 014973178963 Carriage Bolts, 5/16-18... Not all fasteners are applicable for all applications so be certain to test thoroughly and get the opinion of a licensed builder or certified building or structural engineer before relying on these fasteners for any situations where failure would result in damage to property or person. Diameter 1: 5/16 inches Diameter 2: 23/32 inches Length: 3 inches Material: Steel Finish: Zinc Most of our fasteners have a light zinc plating over steel giving a more rust resistant finish. Everbilt 5/16 in.-18 x 3-1/2 in. Galvanized Carriage Bolt 803466 We stock many grades of fasteners ranging from low carbon steel on up to hardened, heat treated steel. New 4-amp Ignition Stators C D I Electronics 173-4954 ... Currently unavailable. We don't know when or if this item will be back in stock