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 2925-00-265-7539
NSN 6620-01-244-0260
NSN 6685-00-317-4319
NSN 6240-00-361-1421
NSN 5895-00-922-3034
NSN 6135-00-145-8884
NSN 2925-01-127-0167
NSN 6610-01-067-4359
NSN 6135-01-633-8502
NSN 7035-00-585-2113
NSN 5975-00-567-2766
NSN 6685-01-065-5797