Schools that certify crane operators (e.g., NCCCO in the US, CPCS in the UK) base their theoretical exams on ISO 4306-1 definitions.

The distance between the centerlines of the wheels supporting the crane, measured parallel to the travel direction.

“We have the PDF,” Lena offered.

ISO 4306-1 specifies terms and definitions related to hydraulic fluid power systems and components — vocabulary used throughout the ISO 4306 series. This paper summarizes the standard’s scope, key definitions, structural organization, practical applications, and guidance for engineers, purchasers, and technical writers who need to use consistent hydraulic terminology.

ISO 4306-1 is the first part of a multi-series international standard dedicated to the vocabulary of lifting appliances. Specifically, Part 1 focuses on .