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 6610-01-540-5424
NSN 5835-01-431-2178
NSN 5905-01-394-5374
NSN 5910-00-219-7865
NSN 5945-01-144-4753
NSN 6240-01-111-5623
NSN 6110-01-158-5866
NSN 5975-01-426-8968
NSN 5910-01-509-4878
NSN 5910-01-382-6380
NSN 5925-01-550-4481
NSN 5945-01-339-4322