Description NTN riveted Flange Disc Harrow Bearing - 1-1/2" Square Bore - Replaces Krause 40-157, Kewanee B3587, Brillion 1K521, McFarlane RD-4498. This item is a suitable alternative for the following: 321-FD211RM, B3587, 40-157, 1K521, DHU112S211, RD-4498