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 6220-01-063-7287
NSN 6650-01-251-7048
NSN 6645-00-079-4087
NSN 5925-01-471-1761
NSN 5905-00-739-0764
NSN 4140-00-505-1684
NSN 6110-00-493-8952
NSN 5960-01-019-6705
NSN 5998-00-288-5533
NSN 5910-01-348-3234
NSN 5835-01-250-6027
NSN 5910-01-586-5852