Stock replacement steel lug nut. These nuts will fit 1970-83 Datsun 240Z, 260Z, 280Z, 280ZX and 510. Thread size M12 X 1.25 for all Datsun Z cars. Choose from 2 different styles standard and "bulge". The factory service manual torque spec for the nut is 60 lb ft. Sold as singles.
standard = 3/4" hex head (zinc color may vary)
bulge= 13/16" hex head