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 6610-00-261-8159
NSN 7035-01-202-9250
NSN 5855-01-110-9564
NSN 6105-01-297-5439
NSN 5935-01-496-0995
NSN 2925-01-317-4543
NSN 5920-00-420-1737
NSN 5895-00-637-2658
NSN 5910-01-403-2812
NSN 6320-01-129-9656
NSN 7035-00-523-7492
NSN 6620-01-511-5352