square nut STANDRAD:DIN557,DIN562,IFI D-3,IFID-12 SQUARE NUT square nut1)different types of square nut2)standard:DIN557,DIN562,IFI D-3,IFID-12 SQUARE NUT. 3)class: 4,6,8,104)surface:plain, black,H.D.G,ZINC,DACROMET5)material: stainless steel ,alloy steel,carbon steel6)package:bulk packing,small boxes,pocket. SQUARE NUT