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 6685-00-455-3729
NSN 5925-01-532-6304
NSN 6110-00-231-9493
NSN 5999-00-913-7245
NSN 5945-00-482-3505
NSN 5895-00-772-5947
NSN 6650-01-096-4993
NSN 5915-01-648-7354
NSN 5935-01-399-0582
NSN 5910-00-508-7416
NSN 6320-00-174-1362
NSN 6130-01-475-2902