Pillow Block Bearing Base Height 2.63 in Base Width 4.5 in Bearing Insert Material Alloy Steel Bearing Insert Type Spherical Roller Bore Diameter 3 15/16 in Center Height 4.25 in Expansion Type Expansion Housing Material Cast Iron Included Bearing Expansion M2000 Spherical Roller Lubricant Material Lithium Grease Maximum Speed 1 200 RPM Maximum Temperature 250 Degrees F Minimum Temperature -40 Degrees F Mount Hole Center-to-Center Length 12 in