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 5905-00-146-0078
NSN 5975-01-365-1308
NSN 5985-01-550-1540
NSN 4140-01-364-1684
NSN 4140-00-997-1599
NSN 6220-01-560-8821
NSN 5835-01-119-8561
NSN 6135-01-066-6904
NSN 5990-01-393-4808
NSN 5950-01-630-8017
NSN 5996-01-378-8028
NSN 4140-01-171-0175