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 6220-01-562-3819
NSN 5935-00-660-9703
NSN 5950-01-472-2467
NSN 5990-01-272-4091
NSN 5985-00-550-8750
NSN 6150-01-147-6177
NSN 7035-01-263-3399
NSN 4140-00-813-9557
NSN 6320-01-600-5808
NSN 6650-00-180-5184
NSN 5930-00-082-8311
NSN 5920-01-643-6404