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 5999-00-556-3278
NSN 5920-00-740-3121
NSN 5915-01-395-6367
NSN 5930-00-947-2507
NSN 6150-01-497-7253
NSN 6110-01-298-3784
NSN 6685-01-353-2375
NSN 5945-00-833-1701
NSN 5990-01-382-5364
NSN 5895-00-503-5344
NSN 6645-00-255-1372
NSN 6650-01-648-3903