How shipping containers lock together

How shipping containers lock together

Shipping containers are intended for carriage via ships, trains and trucks. Their interlocking design ensures a robust and stable structure that guarantees safe transportation. In this article, we will delve into the locking mechanisms of shipping containers and how they remain secured during transit.

The Corner Castings

Interlocking shipping containers rely on corner castings as the main component. These are steel structures that attach to each container’s corners and provide a reliable connecting point. The standardized design of these corner castings makes them compatible with all types of shipping containers.

How shipping containers lock together

Twist Locks

The twist locks function as the devices that secure shipping containers in place. Found at the corners, they are intended to mesh with complementary twist locks on another container. By rotating and securing them into place, two containers can be joined together.

Bridge Fittings

Container connectors, known as bridge fittings, are utilized to link stacked containers together by providing a reliable anchorage point at the top and bottom of each container. The upper containers bridge fittings interlock with the corner castings on the lower container when two containers are piled atop one another.


The Role of Gaskets

Rubber seals known as gaskets are placed between twist locks and corner castings to ensure that shipping containers remain securely fastened. The airtight seal created by these components prevents moisture and other external factors from penetrating the container.


Shipping containers are designed to be airtight, watertight and strong enough to withstand the rigors of transportation. The interlocking system of shipping containers ensures that they remain securely locked together during transport even in rough sea conditions.The corner castings, twist locks, bridge fittings and gaskets all work together to create a stable and secure structure.

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