What is a twistlock and what do you need it for on the container?

As the word implies, the twistlock is required for locking/connecting two containers by rotating this anchor point. A distinction is made between manually locked twistlocks (container stowage on land) and semi-automatic ones (maritime transport). In the latter variant, when the containers are stacked correctly, a spring is automatically tensioned, which triggers the locking with the counterpart, the so-called corner casting.
 
What can the twistlocks withstand? How do you get them locked again? In our Cargo Blog post: "Episode 15: How does a twistlock work?" you will find an illustrated explanation.
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