The Allied Bolt Round Washer (vendor part 11003, Millennium part 584398) is a 5/8 in galvanized washer packed 100 per pack for pole line and aerial hardware fastening jobs. Hot-dip galvanized to ASTM A153, it spreads bearing load under bolt and screw heads on outdoor installations exposed to weathering. It's a standard companion part to 5/8 in machine bolts and lag screws used throughout Millennium's aerial hardware line. Order it alongside lag screws and pole steps for complete pole-mounting fastener kits.