Coupling shown for illustration purposes only. Two hubs required per coupling assembly. A complete coupling assembly comprises two hubs plus an appropriate torque disc ; note that these parts must all be ordered separately. Clamp Style. Clamp style jaw couplings from Ruland. These couplings have a large torque capacity and a balanced design. To complete your assembly two hubs must be purchased. A jaw spider must be placed in between these couplings. Please view our essential extras for suitable jaw spider torque disks.