Glossary
Crane Operator Terms & Vocabulary
15 essential crane operator terms with plain-English definitions: the vocabulary you’ll hear in training and on day one.
Key crane operator vocabulary
These 15 terms come up constantly in crane operator training, on the job and in interviews. Knowing them helps you follow instructions, document accurately and sound prepared.
- Boom
- The arm of the crane.
- Counterweight
- Weight that balances the crane.
- Crane mats
- Mats that spread outrigger loads.
- Critical lift
- A lift with higher risk requiring a detailed plan.
- Dynamic loading
- Extra force from sudden starts and stops.
- Jib
- An extension attached to the boom.
- Load chart
- A chart showing a crane’s lifting capacity at each radius and boom length.
- Load moment indicator (LMI)
- A system that warns when nearing capacity.
- Outriggers
- Extendable supports that stabilize a crane.
- Power line clearance
- Minimum distance from energized lines.
- Radius
- Horizontal distance from the center of rotation to the load.
- Rigger
- The person who attaches loads.
- Signal person
- The person who directs the operator.
- Swing
- Rotating the crane’s upper structure.
- Two-blocking
- When the hook block contacts the boom tip, which can break the rope.
Practice these terms
Test yourself with the free Crane Operator practice test: it includes vocabulary questions built from this list. For a complete course, see Crane Operator training.
Browse terms from every career in our career glossary.