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 6105-01-491-7662
NSN 5915-00-803-8600
NSN 5915-00-807-3662
NSN 6620-01-266-5545
NSN 6620-01-583-8155
NSN 5835-00-814-1359
NSN 5855-00-010-4041
NSN 6645-00-881-9978
NSN 5920-01-052-5828
NSN 5895-01-412-0249
NSN 4140-01-236-2175
NSN 5960-01-487-2175