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 5920-01-477-2837
NSN 6650-01-055-8146
NSN 6150-00-331-6351
NSN 7035-00-320-5644
NSN 5985-00-726-9190
NSN 5950-00-161-0635
NSN 5945-00-844-7602
NSN 5990-01-633-9503
NSN 5998-01-394-5249
NSN 6650-01-507-6173
NSN 5998-01-586-2136
NSN 6105-01-499-2430