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 5990-01-433-7886
NSN 5935-01-337-4940
NSN 6650-01-608-4820
NSN 5999-01-508-9710
NSN 6145-01-422-4485
NSN 5925-00-482-5779
NSN 5935-00-900-5405
NSN 5905-01-281-6957
NSN 7035-01-437-4137
NSN 5935-01-250-3335
NSN 5920-01-309-9216
NSN 5910-00-583-9310