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 5999-01-133-9274
NSN 5855-01-510-2898
NSN 6135-00-271-0407
NSN 5915-01-461-3914
NSN 5925-00-811-2973
NSN 5905-01-298-3908
NSN 6620-01-519-2628
NSN 5975-01-570-6965
NSN 5960-00-314-0991
NSN 5910-01-058-4896
NSN 5855-01-130-1501
NSN 5895-01-647-6006