4 Bolt Flange Bearing, Back Side to Center Width 0.63 in, Bearing Insert Material Alloy Steel, Bearing Insert Type Radial Ball, Bore Diameter 1 in, Bore Type Cylindrical, Closure Double Sealed, Housing Material Cast Iron, Housing Type Square, Included Bearing UC205-100D1, Lubricant Material NLGI #3 Equivalent, Maximum Speed 5,900 RPM, Maximum Temperature 250 Degrees F, Minimum Temperature -40 Degrees F, Mount Hole Center-to-Center Height 2.75 in, Number of Mount Holes 4, Overall Height 3.75 in