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 6650-01-498-9695
NSN 5950-00-630-6305
NSN 6150-01-417-2643
NSN 5945-00-905-0853
NSN 5930-01-211-6679
NSN 6645-01-201-3268
NSN 5996-00-826-8837
NSN 6135-00-112-8637
NSN 2925-01-333-6346
NSN 6685-01-443-6202
NSN 2925-01-322-9780
NSN 5930-00-111-1053