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 6610-01-539-0014
NSN 4140-01-062-3818
NSN 5915-01-403-2599
NSN 6105-01-658-4191
NSN 6130-00-109-9091
NSN 5975-00-859-9906
NSN 5935-00-702-2429
NSN 6220-00-998-0552
NSN 6220-01-245-9242
NSN 6150-01-300-3418
NSN 5835-01-645-2892
NSN 6130-00-405-9409