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 5925-00-302-4637
NSN 5915-01-567-1928
NSN 5930-01-065-2286
NSN 5905-01-332-0343
NSN 5990-01-493-4039
NSN 5960-01-602-6009
NSN 5915-01-616-7658
NSN 6650-01-360-6577
NSN 6620-01-317-4233
NSN 5925-01-580-0279
NSN 6130-00-754-8289
NSN 5930-00-847-7232