What should you do if the rating on a chain or sling is not visible?

If the rating on a chain or sling is not visible, the safest course of action is to refrain from using the sling altogether. The rating provides critical information about the maximum load that the sling can safely handle. Without this information, it's impossible to determine whether the sling is appropriate for the intended load, which poses significant risks, including the potential for failure that could lead to injuries or damage.

Using a sling without knowing its rating means operating with uncertainty around its strength and reliability. Assuming it is safe to use, continuing with caution, or estimating its safe weight capacity can lead to dangerous situations. Each of these alternatives may reduce the safety margin, increasing the risk of an accident. Therefore, if the rating is not clearly marked or visible, it is best practice to not use the sling and replace it or seek clarification regarding its capacity before proceeding.