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 5950-01-399-0248
NSN 5895-01-482-9824
NSN 5915-01-334-1216
NSN 6645-01-563-2812
NSN 6320-00-070-4544
NSN 6145-01-444-1346
NSN 5910-01-226-6374
NSN 6150-01-424-8062
NSN 6150-01-524-0662
NSN 6320-01-455-3394
NSN 5920-00-390-3437
NSN 6135-01-546-4588