3M Disc Retainer Nut, 1/2 in Depth (405-051144-05621)($8.04Value)
For use with all 3M disc pad face plates, disc pads, and 3M disc pad hubs Arbor Thread - TPI or Pitch = 5/8 in - 11 Shank Stem Depth = 1/2 in Type = Nut