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 5960-00-828-4704
NSN 5996-01-117-9250
NSN 5945-00-504-5744
NSN 6240-01-515-0260
NSN 5855-01-254-3041
NSN 6645-01-559-7762
NSN 5915-01-605-3326
NSN 6150-01-431-4143
NSN 6610-01-391-5092
NSN 5998-01-041-3828
NSN 6105-00-424-6283
NSN 5975-01-547-3797