5/16"-18 X 1 1/2" Ribbed Neck Carriage Bolt Grade 5 Fully Threaded Zinc Material: Grade 5 Finish: Zinc Full Size: 5/16"-18x 1 1/2" Diameter: 5/16" Length: 1 1/2" Threads Per Inch: 18 U.O.M.: Imperial Thread Length: Full Thread Thread Type: UNC