4 Bolt Flange Bearing, Back Side to Center Width 0.484 in, Bearing Insert Material Alloy Steel, Bearing Insert Type Radial Ball, Bore Diameter 1 1/4 in, Bore Type Cylindrical, Closure Double Sealed, Housing Material Cast Iron, Housing Type Square, Included Bearing GYA104RRB, Lubricant Material NLGI #2 Equivalent, Maximum Speed 4,400 RPM, Maximum Temperature 200 Degrees F, Minimum Temperature -65 Degrees F, Mount Hole Center-to-Center Height 3.625 in, Number of Mount Holes 4