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 5835-00-025-9951
NSN 5910-00-957-7328
NSN 6150-01-222-2806
NSN 6650-01-174-8427
NSN 5915-01-586-5829
NSN 6130-01-223-9169
NSN 4140-00-224-9149
NSN 5905-01-451-4205
NSN 2925-01-565-6410
NSN 6220-01-514-0381
NSN 5930-00-866-3223
NSN 5998-00-807-4486