A close-coiled helical extension spring, with ends fastened together to form a circle, designed to impose compression stresses toward the center of the circle thus formed when uniformly expanded.
NSN 5950-01-650-9476
NSN 6320-01-274-2501
NSN 6320-01-501-7935
NSN 5975-01-579-4938
NSN 5945-01-303-2860
NSN 6110-00-596-9124
NSN 6130-01-090-0631
NSN 6645-01-128-0895
NSN 5835-01-347-8714
NSN 6130-01-422-5774
NSN 5930-01-155-1597
NSN 5915-00-675-2088