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 5855-00-237-4088
NSN 5910-00-155-4763
NSN 5999-00-028-6947
NSN 6685-01-224-7778
NSN 6145-01-164-2380
NSN 4140-01-183-5451
NSN 5990-01-529-7307
NSN 5835-00-869-9288
NSN 6130-01-391-4572
NSN 6135-00-495-6862
NSN 6620-00-168-0308
NSN 5935-00-104-7528