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 5990-00-009-0950
NSN 6240-01-169-1686
NSN 5985-00-317-8237
NSN 6610-00-943-5588
NSN 6650-00-364-7866
NSN 6110-01-589-8485
NSN 6110-01-113-8976
NSN 6150-01-475-0692
NSN 5920-00-486-0482
NSN 5910-01-254-3758
NSN 6150-01-486-5961
NSN 5915-01-571-9025