Cylindrical Roller Bearing Bearing Industry Number 228 Bore Diameter 140 mm Bore Type Cylindrical Cage Material Brass Closure Open Inner Ring Outside Diameter 153 mm Lubricant Material Grease Oil Maximum Speed 2 400 RPM Grease 2 800 RPM Oil Maximum Temperature 120 Degrees C Minimum Temperature -40 Degrees C Number of Rows One Outer Ring Inside Diameter 237 mm Outside Diameter 250 mm Overall Width 42 mm Ring Material Alloy Steel Roller Material Alloy Steel