4 Bolt Flange Bearing, Back Side to Center Width 0.709 in, Bearing Insert Material Alloy Steel, Bearing Insert Type Radial Ball, Bore Diameter 1 3/16 in, Bore Type Cylindrical, Center Height 1 9/16 in, Closure Single Sealed, Expansion Type Fixed, For Environment Highly Dusty and Dirty, Housing Material Cast Iron, Housing Type Square, Included Bearing WJB UC206-19 Insert Bearing, Lubricant Material Chevron SRI 2, NLGI #2 Equivalent, Maximum Speed 5,500 RPM Grease WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)