5/16 -18 x 2-1/2 Zinc Plated Grade 5 Steel Coarse Thread Carriage Bolts CBS5-169

Diameter: 5/16 Length: 2-1/2 Material: Steel Finish: Zinc Head Style: Carriage Thread Size: 18 (Coarse) Thread Length: Full Hardness: Grade 5 Type: Carriage Bolt Square-Depth: 3/16 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.