30/8 Double Row Angular Contact Ball Bearing  detail Specifications: Metric series Material : 52100 Chrome Steel Construction : Double Row Seal Type : open type Limiting Speed : 34500 rpm Cage : Nylon cage or Steel cage Cage Material : Polyamide(PA66) or Steel Weight : 0.21 kg Main Dimensions: Bore diameter (d): 8mm Outer diameter (D): 12mm Width (B): 11mm Chamfer Dimension( r) min.: 0.3mm Dynamic load ratings(Cr): 5.2 KN Static load ratings(Cor): 2.65 KN   ABUTMENT DIMENSIONS Minimum diameter shaft shoulder (da) min. :10 mm Maximum diameter of housing shoulder (Da) max. : 20mm Maximum fillet radius (ra) max. 0.3 mm