What effect do temperatures higher than 250°F (121°C) have on chains and sling fittings?

When temperatures exceed 250°F (121°C), materials used in chains and sling fittings begin to undergo changes that can significantly impact their structural integrity. Exposure to such elevated temperatures generally leads to a phenomenon known as "thermal degradation." This can cause a permanent reduction in the rated load capacity of these fittings.

In practical terms, this means that the physical properties of the materials can be compromised, leading to a decrease in their strength and ability to safely support loads. The fittings may not return to their original properties even when cooled down, which is why the reduction in load capacity is considered permanent. This understanding highlights the importance of adhering to temperature ratings in rigging and hoisting applications to ensure safety and effectiveness.