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What is a sprag?

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A sprag is a one-way freewheel clutch used in a number of applications. It resembles a roller bearing with rollers shaped like a figure eight and cocked with a spring. When the unit rotates in one direction, the rollers stand up and bind because of oil friction, and when the unit is rotated in the opposite direction, the rollers slip or freewheel. About this image

Sprag, when used as a verb, is a commonly used way of describing the way a tracked vehicle moves.

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