Miniature Bearing Features Miniature Bearings can sustain some axial load in either direction as well as radial loads, And the two raceway cross-sections are simple circular arcs which can be very precisely finished so the bearings have low friction and very little noise or vibration. TECHNICAL SPECS (metric): Bearing type: Shield Bore diameter: 8.000 mm Outer diameter: 22.000 mm Width (B): 7.000 mm Radius (min) (rs): 0.30 mm Dynamic load rating (Cr): 2,799 N Static load rating (Cor): 1,103 N Max speed (Grease): 34,000 rpm Max speed (Oil): 40,000 rpm Max. shaft shoulder dia, inner (Ui): 10.5 mm Min. housing shoulder dia, outer (Uo): 19.03 mm Ball quantity: 7 Ball diameter (Dw): 3.969 mm Precision: ABEC-5 Standard clearance: C0/(K25) This Bearing Structure Standard Type: A ball bearing is composed of an outer and inner ring, balls, seal and a retainer. Open type will no seal, Flanged type with flange side. Colour: silver Material: 52100 chrome steel Package Contents: 80 x Bearings Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.