... other types of bearings,such bearings friction coefficient is small, extreme high speed. However, the impact of intolerance, nufit to bear ... groove ball bearing Brand MaterialGCr15SiMn, GCr15, G20Cr2Ni4ACertificateISO9001:2008PrecisionP0, P6, P5, P4, P2ClearanceC1,C2,C3,C4,C5 etc.Seal TypeRS, 2RS, R2 ...