... hardness 3.high precision 4.good strength 5.powder metallurgy auto parts Nantong Runfeng Powder Metallurgy Co., Ltd. is specializing ... spread out all over the the country, and we supply components to Korea, America and japan. Our products are well ... ,copper sleeve,sleeve bearing, bushing, bush,pulley,timing pulley,structural parts,components,powder metallurgy parts,nut,auto parts,rotor and stator etc.