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 5910-01-648-7798
NSN 5998-01-486-1820
NSN 6105-01-314-6096
NSN 6105-01-457-6198
NSN 5975-01-454-2767
NSN 5895-00-921-6814
NSN 6620-01-248-0358
NSN 5855-01-359-8592
NSN 5996-01-126-7238
NSN 6620-00-842-6372
NSN 6110-00-325-4519
NSN 6645-01-010-3746