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 6105-01-422-3161
NSN 5835-01-463-2334
NSN 7035-01-355-7284
NSN 5895-00-868-6411
NSN 6610-01-441-8364
NSN 6110-01-107-7532
NSN 5835-01-386-4027
NSN 5925-01-050-9032
NSN 6145-00-390-9917
NSN 6645-00-609-7214
NSN 6620-01-398-8986
NSN 5895-01-140-0458