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 6130-01-344-8807
NSN 6650-00-597-7313
NSN 6110-00-984-4273
NSN 5835-00-422-1441
NSN 5945-01-152-1932
NSN 6110-01-400-4207
NSN 5990-01-382-5364
NSN 5915-00-383-1471
NSN 6220-01-288-0266
NSN 6150-00-200-7644
NSN 6135-01-487-6275
NSN 5965-00-477-7587