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 6685-01-278-8376
NSN 5935-01-031-7380
NSN 5905-00-409-3199
NSN 5925-01-538-4747
NSN 6130-00-437-6054
NSN 5835-01-399-5820
NSN 5960-01-357-1261
NSN 4140-00-101-7903
NSN 5998-01-205-2223
NSN 5975-00-498-2486
NSN 5990-01-251-7313
NSN 6650-01-633-4238