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 5930-01-604-9433
NSN 7035-01-569-2151
NSN 5910-01-642-6115
NSN 5925-01-237-3886
NSN 4140-01-356-2253
NSN 5930-01-141-7740
NSN 5996-01-023-3317
NSN 5895-01-140-1048
NSN 7035-00-142-9076
NSN 5855-00-079-2370
NSN 4140-01-618-6417
NSN 6645-01-361-8319