Ship-to-Shore Crane (STS)
A Ship-to-Shore (STS) Crane — also called a quay crane or container gantry crane — is the large dockside gantry crane that loads and discharges containers between a container ship and the quay. Standing on rails along the berth, it reaches out over the vessel on a long boom and uses a spreader to lift containers on and off, moving them between the ship's cells/deck and the quay for onward handling.
STS cranes are the primary determinant of a berth's productivity, measured in container moves per hour; more and faster cranes per ship mean quicker turnaround. As container ships have grown, cranes have grown with them — the largest, super-post-Panamax cranes, reach across 24+ container rows to serve the biggest vessels, which is a key reason ports must invest to handle ultra-large ships. Increasingly they are remotely operated or automated. The STS crane is the iconic, critical machine at the ship–shore interface, and its capacity and speed directly govern how fast cargo flows through a terminal.
The ship-to-shore crane is the pace-setter of a container terminal — moves per hour at the quay decide how fast a ship turns around and sails. As vessels grew, cranes had to grow too, which is why ports invest heavily in bigger, faster, increasingly automated STS cranes. It is the critical machine where sea meets shore.
What is a spreader?
The attachment on the crane that locks onto a container's corner castings to lift it; it can extend to handle 20ft, 40ft or twin containers.
How is crane performance measured?
In container moves per hour — the key driver of berth productivity and vessel turnaround time.