Description

5/16"-18 x 3/4" Zinc Grade 5 Carriage Bolts CBS5-142 (12 pcs.) Diameter: 5/16" Length: 3/4" Material: Steel Finish: Zinc Head Style: Carriage Thread Size: 18 (Coarse) Thread Length: Full Hardness: Grade 5 Type: Carriage Bolt Square-Depth: 3/16" Box of 12. 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.