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 6240-01-377-2560
NSN 6150-01-154-5680
NSN 5930-01-017-2232
NSN 5960-01-072-2876
NSN 5990-01-054-3332
NSN 5920-00-134-5713
NSN 6135-01-582-2589
NSN 6220-01-413-0577
NSN 6150-01-153-7355
NSN 5930-00-644-9537
NSN 6620-01-422-3522
NSN 5920-01-229-6102