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 5975-01-486-3620
NSN 6110-00-774-1792
NSN 5996-00-521-2583
NSN 6650-00-477-4538
NSN 5895-00-916-1728
NSN 4140-01-633-4074
NSN 6240-00-474-5802
NSN 6130-00-545-9943
NSN 5835-01-312-4446
NSN 6685-00-322-0583
NSN 5950-01-237-2431
NSN 4140-01-318-1197