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 5950-00-302-1751
NSN 5990-01-379-8794
NSN 6220-01-337-2933
NSN
NSN 5945-01-057-7078
NSN 5910-01-561-2154
NSN 5895-01-423-9146
NSN 5950-01-448-9779
NSN 5895-01-487-8939
NSN 2925-01-457-5649
NSN 6145-00-726-0363
NSN 6620-00-546-6071