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 6105-00-389-7994
NSN 5920-01-516-6255
NSN 5935-00-239-4976
NSN 5950-01-041-3857
NSN 5965-01-162-8436
NSN 5960-00-265-0726
NSN 6240-00-677-0305
NSN 5998-00-244-8629
NSN 5920-00-987-1605
NSN 5965-00-484-8236
NSN 4140-01-420-5782
NSN 7035-00-052-2188