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 5950-00-401-8712
NSN 5935-00-660-6617
NSN 5855-01-455-4910
NSN 6110-01-400-4207
NSN 5910-00-206-3224
NSN 2925-01-341-0457
NSN 6145-01-341-4228
NSN 5998-00-303-4667
NSN 7035-01-145-5059
NSN 5985-00-285-0798
NSN 5975-01-473-7811
NSN 6130-01-643-5556