3/8 -16 x 4 Zinc Plated Grade 2 / A307 Steel Coarse Thread Carriage Bolts CBS-502

Diameter: 3/8 Length: 4 Material: Steel Finish: Zinc Head Style: Carriage Thread Size: 16 (Coarse) Thread Length: Full Hardness: Grade 2 / A307 Type: Carriage Bolt Square-Depth: 7/32 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.