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 5910-00-649-4498
NSN 6320-00-336-9123
NSN 5895-01-145-5358
NSN 5975-01-211-4419
NSN 6130-01-132-1871
NSN 6150-01-421-7210
NSN 7035-01-391-9858
NSN 5960-01-447-7074
NSN 5895-01-283-0952
NSN 5996-01-431-3578
NSN 6685-01-401-5360
NSN 2925-00-398-0253