Formsprag Clutch Bi-Directional Dual Input Sprag Clutches are used in the automatic system for throttle control of aircraft jet engines to provide a manual override of the servo systems in the event of an emergency or synchronization of the engines.

Formsprag Clutch offers a number of Special Design Backstop clutches, in addition to many standard offerings which can be used, where reverse rotation must be positively prevented. The availability of both Sprag and Ramp & Roller Designs assures a wide product offering to meet the requirements of virtually any application.

Available in six sizes, the Formsprag RL Clutch is a sprag type no-back which permits transmission of driving torque from input to output shaft in both directions of rotation, but restrains any feedback torque of the driven load from rotating the output shaft in either direction

Formsprag Clutch Sprag Retainer Assemblies are used in the Starter drive of a Jet Turbine Engine and provide automatic disconnect of the engine upon light-up.

Through the wide variety of designs offered by Formsprag Clutch and Stieber Clutch in both Sprag and Ramp & Roller Designs virtually any application can be met where reciprocating motion applied to the driving race is transformed into intermittent motion in only one direction at the driven race.

All Formsprag/Stieber clutches described in this catalog are essentially “overrunning” clutches, i.e., they will drive in one direction but overrun (freewheel) in the other direction.Through the wide variety of designs offered by Formsprag Clutch and Stieber Clutch in both Sprag and Ramp & Roller Designs virtually any application can be met where this function is required.

Formsprag Clutch Formlock Bi-Directional Clutches are used in the drive and positioning system of tank turret guns and other mobile guns to prevent the barrels from backdriving from preset.