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 4140-00-580-7038
NSN 6145-00-958-5339
NSN 5945-01-412-7896
NSN 5930-01-463-2304
NSN 6130-01-189-0229
NSN 5960-00-769-7629
NSN 6645-00-079-1430
NSN 5960-01-439-9517
NSN 5990-01-360-2900
NSN 5975-01-648-6659
NSN 5895-00-011-7880
NSN 5998-00-593-0384