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Application	Extended pin fitted to chain to carry an outboard roller.
Failure mode	Sudden shock overload has caused the pin to fail.
Diagnosis	The extended pin has failed due to overload or shock loading. The failure has initiated at the corner of the flat on the pin. The "river markings" flowing away from the crack initial point can be clearly seen.
Solution	Determine the reason for the shock / overload and either remove the cause or re-design the pin to carry the load.