Angular Contact Ball Bearing, Bearing Industry Number 7311, Bore Diameter 55 mm, Cage Material Brass, Closure Open, Contact Angle 40 Degrees , Contact Bearing Type Angular Contact, Lubricant Material MT47 Grease, Matched Bearing Type Duplex, Maximum Speed 7,000 RPM, Maximum Temperature 100 Degrees C, Minimum Temperature -40 Degrees C, Number of Rows One, Outside Diameter 120 mm, Overall Width 29 mm, Ring Material Alloy Steel, System of Measurement Metric, ABEC Rating 3