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 2925-01-607-7754
NSN 6650-00-842-5463
NSN 5975-00-011-3714
NSN 5910-00-789-5172
NSN 6135-00-613-1068
NSN 5998-00-899-5922
NSN 6150-01-495-1009
NSN 5915-00-178-9864
NSN 6610-01-168-7943
NSN 6650-01-508-8939
NSN 6150-01-307-2664
NSN 5965-01-357-2317