What must be stamped on all load rating plates?

The requirement for load rating plates to display the serial number of the unit is critical for several reasons. Primarily, the serial number serves as a unique identifier for each hoisting unit, allowing operators, inspectors, and regulatory agencies to track and maintain the specific details related to that machine. This is important for safety, compliance, and record-keeping purposes, as it ensures that any issues or recalls can be accurately addressed.

Additionally, the serial number facilitates referencing the manufacturer's documentation and maintenance history, which is vital for responsible hoisting operations and managing equipment lifecycles. While other information such as the model, manufacturing date, and load capacities are important, the serial number is particularly essential because it links the machine to its specific safety ratings, inspections, and historical records.