30/7-2Z Double Row Angular Contact Ball Bearing  detail Specifications: Metric series Material: 52100 Chrome Steel Construction: Double Row Seal Type : 2Z,Sealed on both sides Seal material : Metal Lubrication:Great Wall Motor Bearing Grease2#,3# Temperature Range:  -20°to 120°C Limiting Speed: 29500 rpm Cage: Nylon cage or Steel cage Cage Material: Polyamide(PA66) or Steel Weight: 0.01 kg Main Dimensions: Bore diameter (d): 7mm Outer diameter (D): 19mm Width (B): 10mm Chamfer Dimension( r) min.: 0.3mm Dynamic load ratings(Cr): 3.65KN Static load ratings(Cor): 1.7KN   ABUTMENT DIMENSIONS Minimum diameter shaft shoulder (da) min. :9 mm Maximum diameter of housing shoulder (Da) max. : 17mm Maximum fillet radius (ra) max. 0.3 mm