A ship-to-shore (STS) crane, also known as a container crane, is a type of large dockside gantry crane found at many of the world’s container terminals. STS cranes are used for loading and unloading container cargo from shipping container vessels.
This type of container crane is generally classified by its lifting capacity, and the size of the container ships it can load/unload.
At the moment there are 3 common STS crane classifications:
Panamax: This crane can load and unload containers from a container vessel capable of passing through the Panama Canal – approximately 12 to 13 containers wide.
Post Panamax: These cranes can accommodate a container ship too wide to pass through the Panama Canal – approximately 18 containers wide.
Super-Post Panamax: The largest of the modern container cranes are classified for use on vessels with 22 or more containers wide.