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 5950-00-704-9794
NSN 6645-00-772-0532
NSN 5895-01-307-6350
NSN 5945-01-629-3407
NSN 5975-00-132-0989
NSN 5895-01-180-9651
NSN 6130-00-135-4919
NSN 5915-01-541-3957
NSN 7035-01-194-9482
NSN 5930-01-245-9551
NSN 5905-00-216-6576
NSN 5950-01-634-0677