Hex Head Lag Screw Material Steel Finish Zinc Plated Screw Size 5/8 in Fastener Length 4 in Threads per Inch 5 Thread Style Partially Threaded Minimum Thread Length 2 51/64 in Dimensional Standards ASME B18.2.1 Pack Size Small System of Measurement Inch Drive External Hex Drive Size 15/16 in Head Height 0.422 in Head Style Hex Head Width 0.642 in Package Quantity 25