4 Bolt Flange Bearing, Back Side to Center Width 1.016 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 GRA108RRB, Lubricant Material NLGI #2 Equivalent, Maximum Speed 3,680 RPM, Maximum Temperature 200 Degrees F, Minimum Temperature -65 Degrees F, Mount Hole Center-to-Center Height 4 in, Number of Mount Holes 4, Overall Height 5 1/8 in