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 5920-01-364-1866
NSN 5990-01-510-4699
NSN 6145-01-411-6454
NSN 6105-01-056-4473
NSN 6610-01-501-3601
NSN 6320-00-036-3688
NSN 6240-00-057-9498
NSN 5990-00-132-0187
NSN 5975-00-470-7527
NSN 5935-01-484-8816
NSN 6110-01-013-8521
NSN 5895-01-111-1935