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 6645-00-390-7657
NSN 5945-00-917-1741
NSN 6135-00-057-2005
NSN 5920-00-763-3470
NSN 5905-00-370-0215
NSN 6135-01-633-8502
NSN 6220-00-887-0588
NSN 5835-01-357-9235
NSN 6645-00-091-7353
NSN 5975-01-178-5709
NSN 6320-00-218-6105
NSN 6145-00-243-6409