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 5996-00-166-0037
NSN 5945-01-349-3296
NSN 6135-01-438-4320
NSN 5985-01-247-8714
NSN 5925-01-294-5707
NSN 5950-00-419-5352
NSN 5990-00-467-7431
NSN 6650-01-081-5693
NSN 5985-01-042-4606
NSN 6320-01-388-3125
NSN 6685-01-252-8887
NSN 5998-01-384-2798