What percentage of stretch in a chain indicates that it should be replaced?

A chain undergoes wear and deformation due to the loads it supports and the conditions it experiences, such as corrosion and fatigue. The guideline for replacing a chain, based on stretch, is informed by safety standards and practices observed in the industry.

When a chain stretches by 3%, it signifies significant wear and tear that can compromise its integrity and safety in lifting applications. This level of stretch denotes that the chain has reached a point where it may no longer meet the required specifications for safe operation, as it can result in an inability to handle loads accurately or may pose a risk of failure under load.

Regular inspection and adherence to this guideline help prevent accidents and ensure that the equipment remains reliable and safe. Therefore, at this threshold of 3%, it's essential to replace the chain to maintain safety standards in rigging operations.