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 5975-01-634-0678
NSN 6685-01-352-5665
NSN 5965-00-035-4556
NSN 5999-01-082-4488
NSN 5998-01-130-3060
NSN 6105-00-527-7702
NSN 6145-01-568-0573
NSN 5895-00-771-6170
NSN 5985-01-433-2242
NSN 5925-00-546-8965
NSN 6650-01-202-8014
NSN 6110-01-032-6975