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 5925-00-505-7579
NSN 5950-00-343-1910
NSN 2925-00-238-1668
NSN 5965-00-182-7928
NSN 5855-00-189-6066
NSN 6150-00-409-7988
NSN 5990-01-270-3209
NSN 6320-00-242-3300
NSN 6130-01-634-0603
NSN 5925-01-120-9816
NSN 5996-00-461-3416
NSN 5985-01-415-4758