External retaining rings sit in the grooves of shafts of all sizes. The areas of the ring that protrude out from the shaft hold it in place. Trends in recent years have been away from threaded fasteners and in favor of retaining rings. Retaining rings are metal fasteners that are installed into a groove on a shaft or in a housing or bore creating a shoulder that retains an assembly. They eliminate threading, tapping, drilling and other machining operations associated with more traditional fasteners like screws, nuts, bolts, cotter pins, washers and more.

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