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 5985-01-106-7639
NSN 6685-00-671-3483
NSN 5895-01-634-0630
NSN 5895-00-051-8347
NSN 6130-00-904-8438
NSN 6105-01-062-8790
NSN 6220-01-513-0060
NSN 6105-01-289-7193
NSN 5945-01-352-0463
NSN 6620-01-451-3742
NSN 6110-01-531-3616
NSN 5990-01-408-6554