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 5920-01-557-8492
NSN 6135-00-877-1659
NSN 6130-00-478-5708
NSN 5985-00-003-9150
NSN 6105-01-293-4788
NSN 5895-01-382-3241
NSN 5965-01-109-2917
NSN 5945-00-435-8203
NSN 5985-01-393-1671
NSN 6145-01-315-7162
NSN 5835-01-085-5487
NSN 5990-00-900-4459