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 6240-01-517-2994
NSN 5999-01-192-5495
NSN 5950-00-348-6740
NSN 5930-00-904-0524
NSN 6650-00-090-5320
NSN 5990-00-974-1918
NSN 6240-01-181-8744
NSN 5985-00-852-0457
NSN 5910-00-021-9415
NSN 5975-00-823-0979
NSN 5999-00-781-3116
NSN 6610-01-195-3497