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 F1941 Fe/Zn 3ATBody Diameter: 0.678 - 0.768 Inch Diameter: 3/4 Inch Finish: Zinc Grade: Grade 5 Head Diameter: 1.469 - 1.594 Inch Head Height: 0.375 - 0.406 Inch Head Height Max: .406 Head Style: Round Item: Carriage Bolt Length: 3 Inch Material: Medium Carbon Steel Measurement: Inch Origin: Imported Specification: ASME/ANSI B18.5,SAE J429 Square Depth: 0.375 - 0.406 Inch Square Width: 0.741 - 0.768 Inch Thread Length: 3 Inch Thread Type: Coarse Threads Per Inch: 10 Type: Full Threaded