... roller bearing,Spherical roller bearing, Taper roller bearing,Needle roller bearing,Block pillow bearing, Auto bearing Retainer:copper cage,nylon retainer,steel retainer,bakelite retainer, etcMaterial:chrome steel,stainless steel,bearing steel ... 1:12K30: Tapered bore bearing,the taper is 1:30W33: With lubrication groove in outer ring,with three oil holesC2/C3/C4: Internal ...