1/4 -20 x 3-1/2 Galvanized Grade 2 / A307 Carriage Bolts CBS-304 (100 pcs.)

Diameter: 1/4 Length: 3-1/2 Material: Steel Finish: Hot Dip Galvanized Head Style: Carriage Thread Size: 20 (Coarse) Thread Length: Full Hardness: Grade 2 / A307 Type: Carriage Bolt Square-Depth: 5/32 Box of 100. 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.