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 5920-01-005-9621
NSN 5965-00-136-4178
NSN 5855-00-906-5386
NSN 6130-00-865-4821
NSN 5910-01-258-6631
NSN 6645-01-471-2103
NSN 6620-01-168-8450
NSN 5925-00-468-2757
NSN 6620-00-989-8692
NSN 6145-00-188-3657
NSN 2925-01-140-8957
NSN 6650-01-100-0933