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 5998-01-228-6018
NSN 5835-01-459-8664
NSN 5910-01-437-9057
NSN 5965-00-946-5156
NSN 5960-01-624-1170
NSN 6130-01-563-9834
NSN 6620-01-386-5914
NSN 5985-00-941-0483
NSN 5835-01-608-4285
NSN 5835-01-384-3206
NSN 5855-01-242-2572
NSN 5985-01-311-9178