4 Bolt Flange Bearing, Back Side to Center Width 0.828 in, Bearing Insert Material Alloy Steel, Bearing Insert Type Radial Ball, Bore Diameter 1 1/2 in, Bore Type Cylindrical, Closure Double Sealed, Housing Material Cast Iron, Housing Type Square, Included Bearing UC208-24, Lubricant Material NLGI #2 Equivalent, Maximum Speed 4,150 RPM, Maximum Temperature 220 Degrees F, Minimum Temperature -20 Degrees F, Mount Hole Center-to-Center Height 4 in, Number of Mount Holes 4, Overall Height 5.125 in