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 5999-01-575-5806
NSN 6150-01-125-4168
NSN 6150-01-565-3443
NSN 5960-01-264-2087
NSN 6645-00-910-2722
NSN 5990-01-501-5409
NSN 6645-01-542-1472
NSN 5835-01-424-0054
NSN 6650-00-267-9815
NSN 6145-01-634-0388
NSN 5950-01-088-5996
NSN 5910-00-130-5460