... &hardness 3.high precision 4.good strength 5.excellent bearing sleeve Nantong Runfeng Powder Metallurgy Co., Ltd. is ... --sintering--resizing--cleaning--vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T,100T,60T, ... transmission gear,spur gear,bevel gear,helical gear,sleeve,copper sleeve,bearing sleeve,bushing, bush,pulley,timing pulley,structural parts, ...