Tapered Roller Bearing Cup Bore Diameter 2 29/32 in Compatible Cone Grainger Part Number 55PX28 55PX29 Compatible Cone Manufacturer Part Number 25572 25577 25578 25580 25582 25584 25590 Cup Width 0.75 in Maximum Temperature 250 Degrees F Minimum Temperature -40 Degrees F Outside Diameter 3 1/4 in Overall Width 0.75 in Ring Material Alloy Steel System of Measurement Inch Application Forestry Mining Steel Manufacturing Housing Fillet Radius 0.8 mm Ring Material Grade 52100