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 5920-00-843-3848
NSN 5920-00-557-9859
NSN 5998-00-465-6318
NSN 5985-00-717-6508
NSN 5910-01-456-9541
NSN 5999-01-363-7459
NSN 4140-01-573-7708
NSN 6130-01-541-4470
NSN 6620-01-353-6675
NSN 6610-00-761-9414
NSN 6610-01-246-7563
NSN 5905-01-532-2741