... . Swivel flexible High speed limit Low noise Deep groove ball bearings Advantage as below:Bearing the ... pulp, wind, cement, railway, marine, traditional energy etc. Deep Groove Bearings Features and specification of bearingsSeries 181100,87100,81200 ... steel, 52100Cage materialBrass, steelID size80mm 1600mmQuality standardISO9001:2000 and ISO9001:2000/ISO14001:2004PrecisionP0, P6, P5ClearanceC2, C3, C4, ...