... &hardness&density 3.High precision 4.Oem offered 5.Sintered iron bush Nantong Runfeng Powder Metallurgy Co., Ltd. is specializing ... cleaning--vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T,100T,60T,25T,15T,10T,6T ... gear,bevel gear,helical gear,sleeve,copper sleeve,sleeve bearing,iron bush, bush,pulley,timing pulley,structural parts,powder metallurgy ...