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 6105-01-487-5072
NSN 5996-01-460-2505
NSN 5975-01-503-9149
NSN 5960-01-239-9651
NSN 6685-01-037-5186
NSN 5895-00-726-3169
NSN 5999-00-399-1215
NSN 5930-01-660-0859
NSN 7035-01-382-4413
NSN 6150-01-648-5198
NSN 5945-00-833-8948
NSN 4140-01-630-1360