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 6110-01-483-0639
NSN 5910-01-245-3581
NSN 5975-01-134-6966
NSN 6135-01-338-2281
NSN 5975-01-353-5466
NSN 2925-00-480-9068
NSN 6610-00-364-7543
NSN 5945-00-406-9520
NSN 5835-01-012-7667
NSN 6130-00-499-5699
NSN 2925-01-327-3069
NSN 6220-01-469-6213