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 6105-01-532-8006
NSN 5990-01-408-6554
NSN 5975-01-463-3436
NSN 5990-01-546-1649
NSN 6150-01-062-0396
NSN 5930-00-801-1637
NSN 6610-01-375-8942
NSN 6650-00-515-6002
NSN 5998-00-365-8887
NSN 6620-00-292-7000
NSN 5990-00-470-2535
NSN 5998-01-234-7838