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, 1-15/16 in Bore Dia, 2.688 in Barrel Dia, 4.065 in Hub Dia, 3-3/16 in Bolt Circle, 15/32 in Flange Thickness, 4 Bolt Holes, 5/16 x 1-1/4 in Screw, For Use With: MXTH-20 XT Hub, 1-13/32 in Overall Length, 1/2 x 3/16 in Keyway, Cast Iron