Formsprag Backstops for Shaft Mount Gearboxes Formsprag Clutch has been designing and manufacturing backstops for use in shaft mount gearboxes for over 50 years.

Model FHB is a high speed, centrifugal throw-out (C/T) Sprag type backstop with internal sealed ball bearings.

Horizontal Fan Backstops/Vertical Fan Backstops

HSB units are intended for use as backstops on the high speed shaft or intermediate shaft of reducers and as holdbacks on the headshaft of conveyors.

Models LCB-200 and 400 are economical, low-torque clutches designed to prevent problems associated with windmilling in fan applications.

Formsprag Long Life Holdbacks (LLH) are designed for use on conveyor heads hafts, bucket elevators, pumps, or any other machinery where reverse rotation must be positively prevented.

Model RSBW is a specialized backstop based on a DC sprag type dual cage retainer assembly.