Cylindrical Roller Bearing Bearing Industry Number 304 Bore Diameter 20 mm Bore Type Cylindrical Cage Material Brass Closure Open Inner Ring Outside Diameter 24 mm Lubricant Material Grease Oil Maximum Speed 13 000 RPM Oil 15 000 RPM Grease Maximum Temperature 120 Degrees C Minimum Temperature -40 Degrees C Number of Rows One Outer Ring Inside Diameter 45.5 mm Outside Diameter 52 mm Overall Width 15 mm Ring Material Alloy Steel Roller Material Alloy Steel