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 6620-01-617-3915
NSN 5835-00-583-1316
NSN 5905-01-460-2410
NSN 6320-01-489-6044
NSN 5835-01-170-0271
NSN 5915-00-283-1664
NSN 5930-00-753-8777
NSN 6110-01-483-1521
NSN 5960-01-378-1729
NSN 5985-01-068-2744
NSN 6240-00-045-3203
NSN 6645-00-011-9968