What do load chart capacities that are distinguished in bold type signify?

Load chart capacities that are distinguished in bold type indicate capacities based on structural strength. These bold entries typically represent the maximum limits that the crane can support based on its design and construction integrity. This differentiation is essential because it highlights capacities that should be adhered to ensure the crane operates safely and within its engineered limits.

Understanding that these capacities are driven by structural considerations is crucial for crane operators, as it ensures that loads exceed these limits can compromise the integrity of the crane and lead to catastrophic failures. Adhering to these guidelines will help operators maintain safety on the job site and prevent accidents.

The other options may refer to important factors in crane operations but do not align correctly with what bold type signifies in load charts. For instance, the idea of permanent capacities would apply more to the crane's overall ratings rather than the specific emphasis on structural strength.