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 5998-01-534-7301
NSN 6645-01-311-0492
NSN 6110-01-484-9328
NSN 5925-00-529-0441
NSN 5998-00-202-8590
NSN 5950-01-235-3130
NSN 5935-00-469-9466
NSN 5990-01-094-7740
NSN 7035-01-107-2811
NSN 6685-00-273-7017
NSN 5996-00-222-6049
NSN 5998-01-509-2431