... level codes: V4, V3, V2, V1Internal clearance codes: C2, C3, C4, C5Ball bearings material: AISI52100, AISI440C, AISI304, AISI316, ceramicRetainer: PTFE, nylon ... and external snap ring NR.In different radial clearances C5, C4, C3, C2.4.Applications : Typical applications: electric motors, automotive applications ...