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 6645-01-023-8020
NSN 5975-00-166-0092
NSN 5895-00-707-6663
NSN 5998-01-438-1814
NSN 6685-00-914-6735
NSN 5950-01-286-1575
NSN 5835-01-540-4995
NSN 4140-00-141-0132
NSN 4140-00-224-9149
NSN 5905-00-831-5510
NSN 5960-00-131-1218
NSN 6620-01-192-3083