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 6610-00-200-8832
NSN 5965-01-316-4429
NSN 6650-01-219-7060
NSN 6620-01-535-1230
NSN 6620-00-492-4936
NSN 6620-01-522-8002
NSN 5990-00-015-2811
NSN 6220-01-630-5354
NSN 5920-01-415-0153
NSN 5905-00-917-7066
NSN 5920-01-373-6045
NSN 6135-00-152-8729