Hex Head Lag Screw Material Steel Finish Zinc Plated Screw Size 1/2 in Fastener Length 3 1/2 in Threads per Inch 6 Thread Style Partially Threaded Minimum Thread Length 2 1/4 in Dimensional Standards ASME B18.2.1 Pack Size Small System of Measurement Inch Drive External Hex Drive Size 3/4 in Head Height 0.344 in Head Style Hex Head Width 0.515 in Package Quantity 25