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 5920-00-468-3074
NSN 4140-01-317-6441
NSN 5895-00-623-9859
NSN 6610-01-149-1465
NSN 5895-01-193-1070
NSN 5965-00-170-4835
NSN 6685-01-382-4944
NSN 6240-01-013-8895
NSN 6110-00-502-2391
NSN 4140-01-317-3126
NSN 5835-01-359-2575
NSN 5910-00-266-8438