This Allied Bolt Lag Screw (Vendor P/N 581, Millennium Part #537423) measures 1/2 x 3 inches and is built to fasten pole line hardware securely to wood utility poles and other wooden structures. Formed from Grade 2 steel with a Rockwell hardness of B70-B100, it delivers dependable holding strength under aerial line loads and environmental stress. The hot-dip galvanized coating meets ASTM Specification A153, protecting against rust and corrosion for a long service life outdoors. A go-to fastener for utility, telecom, and cable crews installing or maintaining aerial hardware on wood poles.