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 6650-01-619-9986
NSN 5996-01-616-2945
NSN 6620-01-314-8432
NSN 4140-01-070-0137
NSN 5999-00-506-4484
NSN 6620-00-708-2688
NSN 5895-01-220-2939
NSN 5835-01-632-6627
NSN 5930-00-846-8970
NSN 5990-01-285-4633
NSN 5985-01-104-5287
NSN 5905-01-085-8337