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 5999-01-652-4492
NSN 6110-00-179-4260
NSN 6105-01-231-1559
NSN 5835-00-503-2608
NSN 5925-01-191-3980
NSN 6650-01-514-0240
NSN 5965-00-439-6287
NSN 5985-01-474-5141
NSN 4140-01-596-6448
NSN 5945-01-057-0171
NSN 6240-00-372-4841
NSN 6645-01-407-6448