... Main types : deep groove ball bearing , self-aligning ball bearings, cylindrical roller bearings, spherical roller bearing , tapered roller bearing , thrust ball ... .Seal type: open, Z, ZZ, RZ, RS,2RS 7.High precision, low noise 8. Material: Gcr15, Gcr15Simn, G20Cr2Ni4A, Gr18Mo 9. ... , agricultural machinery, construction machinery, construction machinery, and so on. Cylindrical Roller Bearing Retainer