Tapered Roller Bearing Assembly Bearing Industry Number 30304 Bore Diameter 20 mm Bore Type Cylindrical Cage Material Pressed Steel Cone Width 16 mm Cup Width 13 mm Flange Diameter Not Applicable Flange Type Non-Flanged Lubricant Material Not Prelubricated Maximum Temperature 250 Degrees F Minimum Temperature -40 Degrees F Number of Rows One Outside Diameter 52 mm Overall Width 16.25 mm Ring Material Carbon Steel Roller Material Carbon Steel System of Measurement Metric