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Thrust clutch
In backstopping (or holdback) applications, one race is always fixed to a stationary ground member. The function of the clutch is to permit rotation of the mechanism connected to the other race, in one direction only, and to prevent any rotation in the reverse direction at all times. Although the clutch normally overruns most of the time, it is referred to as a holdback or backstop in conveyors, gear reducers and similar equipment because its function is to prevent reverse rotation.