... level codes: V4, V3, V2, V1 5) Internal clearance codes: C2, C3, C4, C5 6) Material: Gcr15, carbon steel, stainless steel7 ... , ABEC-7Vibration level codes: V4, V3, V2, V1Internal clearance codes: C2, C3, C4, C5Material: AISI52100, AISI440C, AISI304, AISI316, CeramicRetainer: PTFE, Nylon ...