At what percentage increase in the hook opening should a fitting be discarded?

A fitting should be discarded if there is a 10% increase in the hook opening. This criterion is established to ensure safety and maintain the integrity of rigging equipment. A slight alteration in the dimensions of a hook can significantly affect its load-bearing capacity and overall performance.

If the hook opening increases beyond this threshold, it indicates wear or damage that compromises its ability to safely secure and support loads. Such modifications can lead to potential failures during lifting operations, which could result in accidents or injuries. By adhering to the 10% guideline for discarding fittings, riggers can help maintain rigorous safety standards and minimize the risk associated with rigging tasks. This practice is critical in ensuring that all rigging components are in optimal condition, reducing the likelihood of equipment malfunction in demanding industrial settings.