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 6320-00-456-2092
NSN 6150-00-899-0740
NSN 6150-01-535-7431
NSN 5930-01-579-1520
NSN 5915-01-626-0572
NSN 6240-01-492-9733
NSN 5910-01-188-6858
NSN 6130-00-490-6739
NSN 5895-01-285-5834
NSN 6150-00-179-9876
NSN 5985-01-205-1234
NSN 5998-01-506-3312