The B-LOC® BCH50 series 3/4 in compression hub is an external locking device that provides a way to mount component's, without the need for a hub, to a 3/4 in diameter shaft. This is accomplished by creating a mechanical interference fit that will transmit 186 ft-lb of torque. Fenner Drives® B-LOC® Keyless Compression Hub, Heavy Duty, Series: BCH50, 3/4 in Bore, 2.047 in OD, 1.654 in Diameter Hub, 186 ft-lb Transmissible Torque, 6610 lb Transmissible Thrust, 33.9 ksi Shaft Contact Pressure, 36 ksi Hub Contact, M5x20 Screw, Steel