The Allied Bolt Lag Screw (vendor part 582, Millennium part 528191) is a 3/8 in x 4 in screw with a 9/16 in hex head for fastening pole line hardware to wood structures on aerial builds. Grade 2 steel with B70-B100 Rockwell hardness and hot-dip galvanizing to ASTM A153 resists corrosion through continuous outdoor exposure. Its mid-size diameter and length fit a broad range of standard hardware mounting jobs on telecom and utility poles. Millennium stocks matching washers and the full lag screw size range to round out a hardware order.