Cylindrical Roller Bearing Bearing Industry Number 204 Bore Diameter 20 mm Bore Type Cylindrical Cage Material Brass Closure Open Inner Ring Outside Diameter 24 mm Lubricant Material Grease Oil Maximum Speed 15 000 RPM Grease 18 000 RPM Oil Maximum Temperature 120 Degrees C Minimum Temperature -40 Degrees C Number of Rows One Outer Ring Inside Diameter 42 mm Outside Diameter 47 mm Overall Width 14 mm Ring Material Alloy Steel Roller Material Alloy Steel