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 5960-01-495-0859
NSN 5945-00-184-7983
NSN 5895-01-154-7565
NSN 5835-01-012-4245
NSN 6105-00-468-0267
NSN 5905-00-439-1085
NSN 5985-00-886-8507
NSN 4140-01-534-6960
NSN 6240-01-592-4068
NSN 6220-00-106-4693
NSN 5950-01-392-1026
NSN 6320-01-129-9656