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 5945-01-142-3321
NSN 6220-01-500-0740
NSN 5960-00-613-1842
NSN 5905-01-265-1088
NSN 6150-00-490-9346
NSN 5975-01-029-4176
NSN 5985-01-071-0699
NSN 5895-01-552-5616
NSN 5998-00-817-4133
NSN 6645-01-477-5316
NSN 5985-01-367-9187
NSN 6150-01-062-2162