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 6145-00-451-6651
NSN 6320-01-519-8767
NSN 6110-00-306-0983
NSN 5935-00-203-1292
NSN 6135-01-553-7711
NSN 5910-00-598-3674
NSN 5930-01-160-8713
NSN 5920-01-200-4639
NSN 6240-00-960-8458
NSN 6685-01-587-5948
NSN 5895-00-955-5569
NSN 6150-00-761-6352