Formsprag clutches and backstops, also known as sprag retainer assemblies, one-way clutches, or freewheels, are the top choice for one-way clutch solutions, whether you need a purely mechanical option or an integral part of a larger hydraulic or electric system. From basic engineered sprag retainer assemblies to complete custom overrunning clutch systems, Formsprag delivers the complexity and precision your application demands. Our free action sprag retainers offer the highest number of load elements compared to other one-way clutch technologies, ensuring superior performance. Sprag Overrunning Clutches are designed to drive in one direction and "freewheel" in the other, making them perfect for high overrunning speeds and backstopping needs. Typical applications include engine and APU starters, engine accessory gearboxes, and main drive gearboxes.