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 6620-01-552-0049
NSN 6220-01-528-3714
NSN 5920-01-069-0270
NSN 7035-01-461-1066
NSN 5998-00-612-1079
NSN 5920-00-137-5026
NSN 6135-01-422-1440
NSN 5996-01-472-2112
NSN 5965-01-089-8579
NSN 5920-00-269-6178
NSN 5999-01-640-7507
NSN 6685-01-607-7300