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 5835-01-469-6009
NSN 5895-01-168-3563
NSN 5910-01-120-3820
NSN 6685-01-485-1316
NSN 2925-00-580-4931
NSN 5999-01-652-7805
NSN 6130-00-461-1674
NSN 5945-01-645-6735
NSN 6320-00-731-6134
NSN 5975-01-059-2705
NSN 6645-00-116-1409
NSN 5855-00-411-8688