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 6110-01-633-9660
NSN 5935-01-093-6455
NSN 5935-00-176-2581
NSN 6130-00-591-7988
NSN 5935-00-526-0540
NSN 6110-01-110-4669
NSN 5925-01-309-7360
NSN 5835-01-270-7899
NSN 5965-01-624-2251
NSN 5905-00-279-5363
NSN 5985-01-570-5753
NSN 5975-01-125-7524