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 5996-01-264-7267
NSN 6685-01-136-2137
NSN 5895-01-287-9752
NSN 6130-01-090-6641
NSN 6240-00-956-6424
NSN 5975-01-117-7324
NSN 5910-00-126-4756
NSN 5975-00-127-7169
NSN 5998-00-235-2394
NSN 5855-00-941-6412
NSN 5855-00-631-4565
NSN 6610-00-633-4338