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 4140-00-219-3146
NSN 5990-01-159-5988
NSN 5895-01-534-6124
NSN 6130-00-156-3029
NSN 6220-01-497-4600
NSN 5915-00-800-2426
NSN 5925-00-552-5393
NSN 5998-00-554-8269
NSN 5999-01-101-0383
NSN 5895-01-018-7111
NSN 5990-01-237-7188
NSN 6145-01-163-3354