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 6220-01-398-0614
NSN 5950-00-019-0177
NSN 5935-01-043-5317
NSN 5855-01-471-3162
NSN 5975-00-949-0179
NSN 5915-01-263-3448
NSN 5990-01-387-3820
NSN 5910-01-226-4760
NSN 5925-01-356-9050
NSN 5835-01-177-1092
NSN 5835-01-209-6410
NSN 5895-01-449-0912