Tapered Roller Bearing Cone Bearing Industry Number 6379 Bore Diameter 2 9/16 in Bore Type Cylindrical Cage Material Pressed Steel Compatible Cup Grainger Part Number 55PY18 Compatible Cup Manufacturer Part Number 6320 Cone Width 2.205 in Maximum Temperature 250 Degrees F Minimum Temperature -40 Degrees F Number of Rows One Outside Diameter 4.961 in Ring Material Alloy Steel Roller Material Alloy Steel System of Measurement Inch Bore Diameter Tolerance +0 to 0.013 mm