Angular Contact Ball Bearing, Bearing Industry Number 3311/5311, Bore Diameter 55 mm, Cage Material Steel, Closure Double Shielded, Contact Angle 30 Degrees , Contact Bearing Type Angular Contact, Lubricant Material Polyrex, Matched Bearing Type Not Matched/Single Bearing, Maximum Speed 5,000 RPM, Maximum Temperature 125 Degrees C, Minimum Temperature -20 Degrees C, Number of Rows Two, Outside Diameter 120 mm, Overall Width 49.2 mm, Ring Material Alloy Steel, System of Measurement Metric