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 5935-01-061-1377
NSN 5915-00-777-4296
NSN 5920-00-453-4377
NSN 5999-00-151-4062
NSN 5950-00-298-1936
NSN 5996-01-123-9038
NSN 6645-01-465-4915
NSN 6110-01-534-9885
NSN 6220-01-049-7204
NSN 5998-00-340-7158
NSN 5905-01-365-2397
NSN 7035-01-284-3535