Rag joint

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A Rag joint is a term used to refer to certain flexible joints found on automobiles. They are typically found on steering shafts that connect the steering wheel to the steering gear input shaft, usually at the steering gear end. They provide a small amount of flex for a steering shaft within a few degrees of the same plane as the steering gear input shaft. It also provides some damping of vibration coming from the steering system, providing some isolation for the steering wheel.

The joint consists of a piece of rubber about 1/2 inch thick and about 3 inches in diameter with reinforcing cords vulcanized in it, similar to a tire's. This disc is bolted or riveted to flanges mounted on the ends of the shafts to connect the steering wheel shaft to the steering gear. The cords can be seen on the edge of this piece of rubber, hence the term "Rag Joint".