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 6620-00-286-5721
NSN 6650-01-175-0841
NSN 7035-01-327-4456
NSN 6110-01-364-0966
NSN 5930-00-203-2080
NSN 5998-00-469-2706
NSN 6685-01-123-9275
NSN 5990-00-067-6791
NSN 6620-00-267-5273
NSN 5895-01-433-1128
NSN 6220-01-464-3618
NSN 6220-01-117-2918