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 5950-01-524-3976
NSN 5950-01-660-0241
NSN 5950-01-160-8176
NSN 6650-01-186-5762
NSN 6105-01-310-5459
NSN 5996-01-044-6958
NSN 6150-00-269-0477
NSN 5990-01-225-2283
NSN 6150-00-145-5206
NSN 5950-01-359-8952
NSN 5895-00-150-7072
NSN 6145-01-566-1989