Diameter: 5/16 Length: 2-1/2 Material: Steel Finish: Zinc Head Style: Carriage...Diameter: 5/16 Length: 2-1/2 Material: Steel Finish: Zinc Head Style: Carriage Thread Size: 18 (Coarse) Thread Length: Full Hardness: Grade 2 / A307 Type: Carriage Bolt A carriage bolt has a domed or countersunk head and the shank is topped by a short...more