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, 3 in Bore Dia, 3-7/8 in Barrel Dia, 5.94 in Hub Dia, 4-9/16 in Bolt Circle, 11/16 in Flange Thickness, 4 Bolt Holes, 7/16 x 1-1/2 in Screw, For Use With: MXTH-30 XT Hub, 2-1/16 in Overall Length, 3/4 x 3/16 in Keyway, Cast Iron