The Allied Bolt Lag Screw (vendor part 47, Millennium part 528348) is a 5/16 in x 1-1/2 in screw with a 1/2 in hex head for attaching pole line hardware to telephone poles and wood structures. Grade 2 steel rated B70-B100 Rockwell hardness with hot-dip galvanizing to ASTM A153 stands up to outdoor exposure on aerial hardware installs. Its short length and small diameter fit light-duty hardware mounts where longer lag screws would be unnecessary. Millennium carries the full lag screw range up through 5/8 in diameters for heavier fastening needs on the same job.