... 4.Large quantity online sales 5.Vast inventory needle roller bearing NAV40331.Material:bearing steel 2.Brand:SKF IAN ... ,HK+,NA48+,NA49+,NA69+,series 4.Retainer:copper cage,nylon retainer,steel retainer,bakelite retainer,etc 5.Feature:low ... equipment.Main Productsthin four point contact ball bearingsthin cross roller bearingshigh precision slewing bearingsrolling bearings MAIN PRODUCTS1.THIN-SECTION ...