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 5910-01-566-7080
NSN 5905-00-007-3954
NSN 5950-01-112-0085
NSN 5910-00-066-5430
NSN 5935-01-498-0692
NSN 6620-01-061-3497
NSN 5855-01-521-4836
NSN 5915-01-208-2350
NSN 6240-00-509-2485
NSN 5999-01-267-2309
NSN 5915-01-237-2480
NSN 6105-01-113-3889