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 6105-01-448-4701
NSN 5925-01-632-3833
NSN 6240-01-537-2246
NSN 6610-01-406-4985
NSN 5925-00-104-8310
NSN 6610-01-299-7171
NSN 5905-00-936-7441
NSN 5960-01-142-1995
NSN 5925-01-353-7911
NSN 2925-00-471-1128
NSN 6620-00-292-7000
NSN 5950-00-168-9049