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 6650-01-298-4138
NSN 5990-01-303-6110
NSN 5835-01-394-3812
NSN 5910-01-088-5883
NSN 6220-01-159-9022
NSN 6135-01-420-0341
NSN 5910-01-256-8771
NSN 6145-01-010-5474
NSN 5920-00-224-1634
NSN 6650-01-192-5515
NSN 5925-01-442-5795
NSN 5910-01-361-4674