3/8″-16 x 7-1/2″ Zinc Grade 2 / A307 Carriage Bolts (48 pcs.)
Diameter: 3/8″ Length: 7-1/2″ Material: Steel Finish: Zinc Head Style: Carriage Thread Size: 16 (Coarse) Thread Length: Partial Hardness: Grade 2 / A307 Type: Carriage Bolt Square-Depth: 7/32″ Box of 48. 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.