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 5960-01-528-1147
NSN 4140-01-645-4628
NSN 6110-01-374-0836
NSN 5975-00-239-2364
NSN 5960-01-496-3712
NSN 5990-00-441-7974
NSN 6610-01-529-8529
NSN 6620-00-239-6153
NSN 5960-00-982-8546
NSN 6240-00-889-8442
NSN 5935-01-201-3047
NSN 5975-01-172-5965