Caution must be taken when using chains due to varying _____.

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Varying tensile strengths of chain are what drive this caution. Chains come in different grades and sizes, each with a specific ability to withstand pulling forces. Because the load you’re dealing with can vary, you must pick a chain whose tensile strength (and working load limit) safely exceeds that load. Using a chain with insufficient strength, or one that’s worn or damaged, can lead to sudden failure under load. So, always match the chain’s strength rating to the task, inspect for wear, and avoid assuming all chains will perform the same.