... hardness 3.High precision 4.Oem offered 5.Sintered oil impregnated bearing Nantong Runfeng Powder Metallurgy Co., Ltd. is ... :mixing--compacting--sintering--resizing--cleaning--vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce ... gear,bevel gear,helical gear,bronze bearing,copper sleeve,oil impregnated,bushing,bush bearing,pulley,timing pulley,structural parts,powder ...