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 6685-01-474-8326
NSN 5999-01-559-0254
NSN 6130-01-471-2501
NSN 6135-00-309-0074
NSN 5996-01-372-2154
NSN 5895-01-349-6045
NSN 7035-00-188-6674
NSN 6240-01-459-3309
NSN 6135-00-152-8729
NSN 5930-01-017-0022
NSN 6130-01-181-8221
NSN 5950-00-669-5873