4 Bolt Flange Bearing, Back Side to Center Width 0.937 in, Bearing Insert Material Alloy Steel, Bearing Insert Type Radial Ball, Bore Diameter 1 1/2 in, Bore Type Cylindrical, Closure Double Sealed, Expansion Type Fixed, Housing Material Cast Iron, Housing Type Square, Included Bearing A-UEL208-108D1, Lubricant Material NLGI #3 Equivalent, Maximum Speed 3,700 RPM, Maximum Temperature 250 Degrees F, Minimum Temperature -40 Degrees F, Mount Hole Center-to-Center Height 4 in