Cylindrical Roller Bearing Bearing Industry Number 305 Bore Diameter 25 mm Bore Type Cylindrical Cage Material Brass Closure Open Inner Ring Outside Diameter 31.5 mm Lubricant Material Grease Oil Maximum Speed 11 000 RPM Grease 9 300 RPM Oil Maximum Temperature 120 Degrees C Minimum Temperature -40 Degrees C Number of Rows One Outer Ring Inside Diameter 55.5 mm Outside Diameter 62 mm Overall Width 17 mm Ring Material Alloy Steel Roller Material Alloy Steel