Insert Bearing, Ball Material Alloy Steel, Bearing Industry Number ER-40, Bearing Insert Type Radial/Deep Groove Ball, Bearing Insert Shape Cylindrical, Bore Diameter 2 1/2 in, Cage Material Brass, Closure Double Sealed, For Environment Highly Dusty and Dirty, Inner Ring Outside Diameter 3.438 in, Lubricant Material NLGI #2 Equivalent, Maximum Temperature 220 Degrees F, Minimum Temperature -20 Degrees F, Outer Ring Width 1.375 in, Outside Diameter 4 29/32 in, Ring Material Alloy Steel