5/8″-11 x 4″ Zinc Grade 2 / A307 Carriage Bolts (26 pcs.)
Diameter: 5/8″ Length: 4″ Material: Steel Finish: Zinc Head Style: Carriage Thread Size: 11 (Coarse) Thread Length: Full Hardness: Grade 2 / A307 Type: Carriage Bolt Square-Depth: 11/32″ Box of 26. A carriage bolt has a domed or countersunk head, and the shank is topped by a short square section under the head. The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.