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 6220-00-531-6430
NSN 5965-01-104-5102
NSN 5895-00-890-9177
NSN 6650-01-245-2791
NSN 5925-01-385-4412
NSN 5835-01-268-1924
NSN 6610-01-568-7028
NSN 6135-00-548-2765
NSN 5855-01-532-0402
NSN 6135-01-265-1384
NSN 6130-01-160-8430
NSN 5960-00-490-6238