Features :
Shield / closure: open ball bearing, Z, ZZ, RS, 2RS,2RZ
Ball bearings snap ring: N, NR Tolerance codes: ABEC-1, ABEC-3, ABEC-5
Vibration level codes: V4, V3, V2, V1
Internal clearance codes: C2, C3, C4, C5
Ball bearings material: GCr15, SAE52100(USA), DIN100Cr6(Germany), BS535A99(UK)
Cage: SPCC, nylon66
Hardness for rings and balls: 60- - 65HRC
Lubrication: Oil, Grease
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