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 6650-01-156-8173
NSN 6240-01-352-3642
NSN 7035-01-364-0286
NSN 5895-00-509-3095
NSN 6240-00-419-4301
NSN 2925-00-614-1758
NSN 5996-01-366-2140
NSN 6620-00-877-3266
NSN 6130-01-428-6756
NSN 5998-01-009-0149
NSN 4140-01-521-0305
NSN 5998-01-341-8841