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 5965-01-576-8847
NSN 2925-01-018-6725
NSN 7035-01-472-1999
NSN 6685-01-008-8886
NSN 5950-00-021-3937
NSN 6110-00-263-4536
NSN 5998-01-199-4923
NSN 5998-01-534-9984
NSN 6685-01-194-3931
NSN 5925-01-060-5265
NSN 5996-01-147-1925
NSN 6240-00-003-6435