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 6645-01-395-9223
NSN 6110-01-362-0298
NSN 6135-00-175-7132
NSN 5895-01-390-2330
NSN 5965-01-378-7096
NSN 6240-00-381-5833
NSN 5905-00-988-0160
NSN 5960-00-425-3476
NSN 5975-01-089-9053
NSN 5895-01-380-7603
NSN 7035-01-291-6468
NSN 6130-01-141-7038