Martin's MXT® bushings are available from stock to fit all popular pulley sizes. Martin stocks MXT® bushings in a wide range of bore sizes per hub. The MXT® bushing offers a 2 in/ft taper, which reduces end disc pre-stressing, as well as increasing clamping force. All bushings size 50 and larger feature full depth keys. Martin MXT® Conveyor Bushing, 2-3/16 in Bore Dia, 3.188 in Barrel Dia, 4.69 in Hub Dia, 3-3/4 in Bolt Circle, 5/8 in Flange Thickness, 4 Bolt Holes, 3/8 x 1-3/4 in Screw, For Use With: MXTH-25 XT Hub, 1-7/8 in Overall Length, 1/2 x 1/4 in Keyway, Cast Iron