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 5975-00-890-6808
NSN 5930-01-237-2596
NSN 6645-01-611-5068
NSN 5930-01-054-6659
NSN 6320-01-158-2177
NSN 6110-00-156-6468
NSN 6110-00-056-8133
NSN 6130-01-623-1046
NSN 6105-01-339-8258
NSN 5990-00-016-5648
NSN 6145-01-094-8150
NSN 5996-01-323-6008