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 5960-01-253-6687
NSN 6650-00-031-8467
NSN 6135-01-381-4675
NSN 5920-01-429-0354
NSN 6240-01-594-0059
NSN 6320-00-194-4252
NSN 6320-00-242-3300
NSN 5990-00-724-3087
NSN 5990-01-548-3711
NSN 6240-01-456-3923
NSN 5920-01-454-9374
NSN 6610-00-935-7131