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 5975-00-327-4477
NSN 6610-01-525-6616
NSN 6650-00-503-9633
NSN 5915-01-578-2263
NSN 6320-00-646-3311
NSN 6685-00-826-9381
NSN 6610-01-210-2051
NSN 6130-01-181-7068
NSN 6620-01-619-3980
NSN 6135-01-111-1495
NSN 6130-01-392-8347
NSN 6650-01-158-6888