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 5998-00-903-0889
NSN 6610-00-536-4977
NSN 7035-00-193-2269
NSN 5990-01-024-9659
NSN 6130-01-004-0723
NSN 5855-01-391-3819
NSN 6110-01-365-9286
NSN 5999-00-247-1352
NSN 5855-01-543-5011
NSN 6105-01-026-2293
NSN 6220-01-232-1064
NSN 5925-01-115-4405