1/4″-20″ x 1/2″ 18-8 Stainless Steel Coarse Thread Carriage Bolts (50 pcs.)
Diameter: 1/4″ Length: 1/2″ Material: Stainless Steel Head Style: Carriage Thread Size: 20 (Coarse) Thread Length: Full Hardness: 18-8 Type: Carriage Bolt Square-Depth: 5/32″ Box of 50. 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.