ZENSO precision locknuts are made of high quality C45 steel, with black oxide surface treatment. Optional material: 42CrMo, 40Cr, stainless steel ect. Optional surface treatment: galvanizing, nickel plating, phosphating, etc. ZENSO supplies a wide range of locknuts with three point radial locking, axial locking method. They ensure workpiece long work life, reliable and powerful locking. It's easy to mount and dismount, and no damage to the shaft.