... hardness&density 3.High precision 4.Oem offered 5.Sintered bronze bushing Nantong Runfeng Powder Metallurgy Co., Ltd. is specializing ... in powder metallurgy,oil bearings,structural parts,gears(sprockets) and different parts used in ... --cleaning--vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T,100T,60T,25T,15T, ...