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 5999-00-467-6714
NSN 6645-01-175-1392
NSN 6610-01-487-3794
NSN 6645-00-229-1521
NSN 5975-01-109-8593
NSN 5999-01-479-2233
NSN 5965-00-568-5802
NSN 6650-01-655-8666
NSN 5905-00-516-2871
NSN 5998-00-080-9000
NSN 6685-01-398-5482
NSN 5975-01-631-5535