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 5895-00-915-0873
NSN 6645-01-356-5946
NSN 5925-01-139-5372
NSN 5999-00-768-2970
NSN 5935-00-717-3661
NSN 7035-01-144-6408
NSN 5990-01-087-7081
NSN 6610-01-411-6800
NSN 5996-01-652-2012
NSN 6135-01-423-7502
NSN 6105-01-497-3423
NSN 6145-01-512-8688