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 6320-01-421-3777
NSN 5996-01-632-3650
NSN 4140-01-634-0330
NSN 5950-01-592-3145
NSN 5910-01-329-7853
NSN 6645-00-358-7379
NSN 6645-01-056-5291
NSN 5990-01-348-9843
NSN 5985-01-410-9751
NSN 6135-01-324-7718
NSN 5910-00-515-3586
NSN 5835-00-792-8438