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 5990-01-217-4590
NSN 2925-01-448-2880
NSN 5950-01-139-3900
NSN 5998-00-622-8422
NSN 5950-01-321-4002
NSN 5996-00-235-0823
NSN 6135-00-990-1822
NSN 2925-01-588-3507
NSN 5930-01-081-0029
NSN 5999-01-336-0333
NSN 5985-01-478-2854
NSN 5935-01-497-0731