Cylindrical Roller Bearing Bearing Industry Number 308 Bore Diameter 40 mm Bore Type Cylindrical Cage Material Brass Closure Open Lubricant Material Grease Oil Maximum Speed 14 200 RPM Maximum Temperature 150 Degrees C Minimum Temperature -30 Degrees C Number of Rows One Outer Ring Inside Diameter 75.9 mm Outside Diameter 90 mm Overall Width 23 mm Ring Material Alloy Steel Roller Material Alloy Steel Seal Type Not Applicable Split Bearing Yes System of Measurement Metric