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 5998-00-369-1101
NSN 5985-00-820-7978
NSN 6320-00-681-1324
NSN 5950-01-438-7330
NSN 5985-01-314-5284
NSN 2925-01-609-8464
NSN 6220-00-761-6253
NSN 6685-00-555-4198
NSN 6645-01-483-0286
NSN 5996-01-552-8516
NSN 5999-01-420-0144
NSN 6130-01-464-4174