Cylindrical Roller Bearing Bearing Industry Number 306 Bore Diameter 30 mm Bore Type Cylindrical Cage Material Brass Closure Open Inner Ring Outside Diameter 36.5 mm Lubricant Material Grease Oil Maximum Speed 11 000 RPM Oil 9 300 RPM Grease Maximum Temperature 120 Degrees C Minimum Temperature -40 Degrees C Number of Rows One Outer Ring Inside Diameter 65.5 mm Outside Diameter 72 mm Overall Width 19 mm Ring Material Alloy Steel Roller Material Alloy Steel