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 5/8 in, Bore Type Cylindrical, Closure Double Sealed, Housing Material Cast Iron, Housing Type Square, Included Bearing A-UC209-110D1, Lubricant Material NLGI #3 Equivalent, Maximum Speed 3,500 RPM, Maximum Temperature 250 Degrees F, Minimum Temperature -40 Degrees F, Mount Hole Center-to-Center Height 4.125 in, Number of Mount Holes 4