A-B2151IMP-AI DISC BRG IMPOne New Aftermarket Replacement Disc Bearing for Kewanee Disc Harrows This aftermarket replacement disc bearing (part number B2151IMP) is a spherical ball bearing with a square bore, designed for use on Kewanee disc harrows. The regreaseable design helps extend service life in demanding field conditions where dirt, moisture, and debris accelerate wear on standard bearings. Specifications Bore: 1 1 8" (square bore) Outside Diameter: 80mm (3 5 32")