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 6685-00-310-4060
NSN 7035-00-897-4994
NSN 5975-00-135-6607
NSN 5835-01-120-5079
NSN 6620-00-707-4195
NSN 5915-01-551-0745
NSN 5998-00-369-1101
NSN 6610-01-242-9674
NSN 5999-00-203-5573
NSN 4140-01-503-2369
NSN 6610-00-677-5976
NSN 6105-00-058-8915