Where do chains show signs of wear?

Chains exhibit signs of wear predominantly at the bearing surfaces of each link. This occurs due to the constant movement and friction that happen as the chain is used under load. As the links articulate against each other, the surfaces can become worn down, leading to a loss of strength and stability in the chain. Regular inspections should focus on these bearing surfaces to ensure they are not excessively worn, which could compromise the chain's ability to perform safely.

In contrast, the other parts such as hooks, master rings, and hoists, while they also require inspection, typically exhibit different types of wear or damage. Hooks may show deformation or cracking, the master ring might have issues related to alignment or integrity, and hoists can face wear in their mechanical components rather than the link surfaces. Each component plays a vital role in the overall lifting system, but it's the links themselves that are most prone to the wear that affects their mechanical function directly.