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 5985-00-081-9836
NSN 6110-01-546-6925
NSN 6105-00-508-1239
NSN 6650-01-521-2077
NSN 5999-00-244-1981
NSN 5950-00-941-3186
NSN 6610-00-417-4299
NSN 5855-00-832-9341
NSN 5920-01-461-8719
NSN 6620-01-266-1663
NSN 5895-01-634-0630
NSN 5915-00-461-5497