What is the only grade acceptable for overhead chain hoisting?

For overhead chain hoisting, the acceptable grade is A. This refers specifically to the grade of chain that is designed to meet the safety and performance requirements necessary for lifting operations. Grade A chains are manufactured to stringent specifications, ensuring high tensile strength and durability, which are essential for safely handling heavy loads overhead.

The use of Grade A chains is critical because they are engineered to withstand the high-stress conditions associated with lifting. They are subjected to rigorous testing and manufacturing standards to ensure they can handle repeated cycles of loading and unloading without deforming or failing. This makes them suitable for overhead applications where safety is a paramount concern.

In contrast, other grades may not provide the necessary strength or safety features for overhead lifting. Chain grades like B, C, and D are typically intended for less demanding applications and might not pass the critical safety standards required for overhead hoisting. Each grade reflects different levels of manufacturing quality, with Grade A being the highest for the required applications.