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 5920-00-758-7846
NSN 4140-01-506-4547
NSN 5998-01-573-5880
NSN 5855-01-446-1936
NSN 5950-01-152-2622
NSN 6685-01-432-0055
NSN 5985-01-464-0075
NSN 5855-01-138-4985
NSN 5835-01-209-6410
NSN 7035-00-193-2269
NSN 6150-01-322-4927
NSN 2925-01-492-9863