Official Answer
Answer
Galling is a form of wear caused by adhesion between sliding surfaces, common in stainless steels. During installation, if a spiral ring is expanded over a shaft without lubrication, the high localized pressure can cause the surfaces to weld and then tear. Forensic indicators include 'smeared' metal on the ID of the ring and matching 'torn' tracks on the shaft. This not only damages the shaft finish but can also 'work-harden' the ring locally, making it brittle and prone to cracking. Prevention involves the use of anti-seize compounds or choosing a ring with a specialized dry-film lubricant (like PTFE or MoS2) which provides a barrier between the two metal surfaces during the winding process.
