C=Two-Piece Pressed Steel Cage With Guide Ring. K30=Tapered Bore, Taper 1:30. E4=(W33-SKF)=Lubrication Groove And Three Holes In Bearing Outer Ring. C4=Bearing Internal Clearance Greater Than C3. S11=(Segment Heat Stab., Code 1)= (S1-SKF)=Inner And O