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 6150-00-762-0956
NSN 5945-00-580-0873
NSN 2925-00-831-7024
NSN 5915-01-524-4157
NSN 5990-01-579-2711
NSN 6320-01-422-1212
NSN 6105-01-578-7537
NSN 5905-01-225-1410
NSN 4140-01-568-7925
NSN 5895-00-927-8002
NSN 2925-00-714-3932
NSN 5920-00-835-6981