Hex Head Lag Screw Material Steel Finish Zinc Plated Screw Size 3/8 in Fastener Length 2 1/2 in Threads per Inch 7 Thread Style Partially Threaded Minimum Thread Length 1 1/2 in Dimensional Standards ASME B18.2.1 Pack Size Small System of Measurement Inch Drive External Hex Drive Size 9/16 in Head Height 0.25 in Head Style Hex Head Width 0.388 in Package Quantity 50