Angular Contact Ball Bearing, Ball Material Alloy Steel, Bearing Industry Number 71901, Bore Diameter 12 mm, Cage Material Phenolic, Closure Open, Contact Angle 15 Degrees , Contact Bearing Type Angular Contact, Matched Bearing Type Duplex, Maximum Speed 50,400 RPM, Maximum Temperature 120 Degrees C, Minimum Temperature -40 Degrees C, Number of Rows One, Outside Diameter 24 mm, Overall Width 6 mm, Ring Material Alloy Steel, System of Measurement Metric, ABEC Rating 7, Cage Type Stratified