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 5895-00-819-1273
NSN 5998-00-429-2560
NSN 6685-01-174-5598
NSN 5990-01-187-2981
NSN 6130-00-870-6792
NSN 5835-00-074-3700
NSN 6135-00-995-1089
NSN 6240-01-246-4258
NSN 5999-01-248-7473
NSN 6620-00-932-6508
NSN 6105-01-151-0303
NSN 5965-00-408-5501