The standard applies to and their corresponding running rails (typically flat-bottom or square-section rails as per ISO 7065). It explicitly excludes:

The main objective of this standard is to ensure safe operation and maximize the service life of crane components by limiting excessive loads, misalignments, and deviations from normal dimensions. Key Components Covered by the Standard

is an international standard developed by the Technical Committee ISO/TC 96 (Cranes) to specify the permissible tolerances for the wheels, travel, and traversing tracks of cranes. It is part of a broader series, with Part 1 focusing on general requirements and Part 4 focusing on jib cranes.

When massive overhead travelling cranes or gantry cranes transport loads weighing hundreds of tons, minor structural deviations can cause major operational catastrophic failures. If a crane gantry track is slightly misaligned, or the span varies across the runway, the crane wheels experience severe lateral friction known as "crane tracking" or "wheel skewing."