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 5985-00-055-1053
NSN 6145-01-241-9221
NSN 5915-01-064-5721
NSN 6220-01-009-6157
NSN 5950-01-301-6954
NSN 6145-01-487-8043
NSN 6620-00-955-6122
NSN 5930-00-189-1480
NSN 5835-01-215-5961
NSN 6620-01-121-4019
NSN 5985-01-356-0280
NSN 5999-01-474-4007