Hair pin retainers, also known as hairpin clips or cotterless hitch pins, are essential fasteners used to secure components on grooved shafts in various mechanical and automotive applications. These retainers offer a simple and reliable method for retaining parts in place without the need for threaded fasteners or cotter pins. The design of hair pin retainers typically consists of a U-shaped wire formed into a loop at one end and two straight legs at the other end. The looped end is inserted into the grooved shaft, while the straight legs extend outward to prevent the retainer from sliding out of place. Once inserted, the tension between the legs and the groove of the shaft holds the retainer securely in position, preventing unintended movement or dislodgment of the component it secures.

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