... hardness 3.High precision 4.Oem offered 5.Powder metal parts Nantong Runfeng Powder Metallurgy Co., Ltd. is specializing ... Ltd. is a professional powder metallurgy manufacturer.2.process:mixing--compacting--sintering--resizing--cleaning--vacuum oiling--packing3.material ... bearing, bushing, bush,pulley,timing pulley,structural parts,powder metal parts,nut,auto parts,sintered parts,rotor and stator etc.