How does 'Rotation in Groove' lead to failure, and how can it be detected during inspection?

Rotation in the groove occurs when the retained component rotates relative to the ring, or when the ring lacks sufficient radial tension to 'grip' the groove bottom. This causes abrasive wear on the groove sides and the ring's faces. Over time, the groove becomes wider and the ring becomes thinner, leading to a loss of thrust capacity. Detection during inspection is evidenced by 'polishing' or circular scoring marks on the ring and groove surfaces. In severe cases, the ring may show signs of 'bluing' due to frictional heat. Prevention involves ensuring proper ring tension or using a 'self-locking' ring that prevents rotation via a tab-in-slot design.