Origin: ImportedAlso know as a coach bolt or round head square neck bolt, carriage bolts are intended for use through iron strengthening plates on either side of a wooden beamIt is commonplace to use them into bare timberCarriage bolts have a squared section under their round head that grip to prevent rotationFinish as per ASTM F2329Body Diameter: 0.559 - 0.642 Inch Diameter: 5/8 Inch Finish: Hot Dipped Galvanized Grade: A Head Diameter: 1.219 - 1.344 Inch Head Height: 0.313 - 0.344 Inch Head Style: Round Item: Carriage Bolt Length: 4-1/2 Inch Material: Low Carbon Steel Measurement: Inch Origin: Imported Specification: ASME/ANSI B18.5,ASTM A307 Square Depth: 0.313 - 0.344 Inch Square Width: 0.616 - 0.642 Inch Thread Length: 4-1/2 Inch Thread Type: Coarse Threads Per Inch: 11 Type: Full Threaded