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 6145-00-981-3224
NSN 6220-01-146-4469
NSN 5915-01-657-1561
NSN 5935-00-079-1650
NSN 5975-01-231-2252
NSN 6110-01-584-3755
NSN 5895-01-034-7102
NSN 5930-01-143-7669
NSN 5990-00-125-5036
NSN 6320-01-457-2805
NSN 6620-01-444-4048
NSN 6685-01-336-6128