Official Answer
Answer
A spiral retaining ring is coiled from flat wire and has no 'ears' or 'lugs' like a stamped circlip. To allow for removal, a small 'notch' or 'slot' is integrated into one of the ends of the ring. This notch allows a technician to insert a screwdriver or specialized tool to pry the end of the ring out of the groove. Without a properly designed removal notch, the ring is nearly impossible to remove without damaging the shaft or bore. In heavy machinery, where components are often covered in grease or debris, the notch must be large enough to be located visually or by feel. Furthermore, the notch geometry is designed to ensure it does not create a significant stress concentration point that could lead to fatigue failure during operation.
