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 6150-00-287-6662
NSN 5950-01-296-6767
NSN 5998-00-931-6777
NSN 5915-01-100-4105
NSN 6105-01-340-8045
NSN 5915-00-339-3015
NSN 5910-01-633-9963
NSN 6105-00-965-9796
NSN 5945-01-534-0755
NSN 5960-01-456-1735
NSN 6685-00-316-9259
NSN 5990-01-423-2219