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 5945-00-055-1770
NSN 5855-01-027-1571
NSN 5910-01-160-8773
NSN 5985-00-374-1062
NSN 5975-00-693-5922
NSN 6130-01-535-0430
NSN 5945-01-367-6469
NSN 6650-01-062-8105
NSN 5990-00-170-9553
NSN 6145-00-802-2384
NSN 5965-00-153-5216
NSN 6320-01-307-6505