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 5996-01-050-6910
NSN 5835-01-561-2959
NSN 5910-01-031-4574
NSN 5835-01-190-5192
NSN 5930-00-711-0848
NSN 6150-00-201-9583
NSN 6610-00-900-7685
NSN 5935-00-060-7339
NSN 5925-00-837-2389
NSN 5925-00-759-0660
NSN 4140-01-133-9011
NSN 6220-00-941-8758