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 5965-00-942-1602
NSN 6240-00-099-8606
NSN 5999-00-885-6728
NSN 6135-00-877-1659
NSN 2925-01-314-3823
NSN 5985-01-487-4053
NSN 5895-01-501-9102
NSN 4140-01-461-7885
NSN 5935-00-660-5488
NSN 5855-01-267-2341
NSN 5996-01-507-1515
NSN 5975-00-890-6808