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 6145-01-259-8816
NSN 6150-01-551-1191
NSN 5975-01-274-0322
NSN 5905-01-311-0584
NSN 6650-00-413-6619
NSN 5925-00-331-9297
NSN 6150-00-467-5808
NSN 5996-01-187-5535
NSN 5990-01-546-1649
NSN 5996-00-933-7738
NSN 6150-00-924-0456
NSN 6645-01-347-0450