Intermediate Twistlock IF-51 Left-Blocking
Left-blocking Twistlock for locking stacked shipping containers
| Property | Value |
|---|---|
| Article number | 10-03-0003-00 |
| Breaking strength | 50 ton |
| Length | 11 cm |
| Steel grade | 40Cr |
| Width | 15,7 cm |
The Semi Automatic Twistlock IF-55 is the solution when you need to quickly lock two stacked containers securely together. Thanks to the automatic locking mechanism, it saves valuable time during loading and unloading. You only need to position it and then locking happens automatically.
Unlike manually operated variants, the IF-55 twistlock locks automatically as soon as it is placed into a container corner. This enables a faster and more efficient working method, especially when multiple containers must be stacked. Unlocking is done using a stainless-steel pull cable with an orange button, giving you full control over the release process.
The IF-55 can be attached to the underside of the upper container as well as to the top side of the lower container. In both cases, the smart construction ensures a safe, stable connection. When placed, the point automatically snaps into the locked position without requiring manual intervention.
Releasing containers is simple. By pulling the stainless-steel cable to the correct position, the twistlock disengages from the upper or lower container. The IF-55 remains inside the container when you lift it, ready for reuse at the next loading cycle.
The housing of the IF-55 is made of high-quality galvanized steel and resistant to corrosion, salt, impact and temperature fluctuations. Both the tips and the internal parts are robustly coated, ensuring years of reliable operation even in maritime environments.
The IF-55 is ideal for applications where speed and reliability are crucial, such as ports, terminals and large logistics hubs. Its semi-automatic mechanism makes the twistlock extremely efficient in terms of time and safety. It prevents incorrect placement because the mechanism locks automatically.
A semi-automatic twistlock is a locking device that closes automatically as soon as a container is placed. The user doesn't need to turn a lever to link the containers.
The Semi Automatic Twistlock IF-55 locks under the weight of the container. As soon as the twistlock is fully seated in the corner casting, the mechanism automatically rotates into the locked position.
This makes stacking faster, requiring fewer actions when loading containers.
The difference lies in the moment of locking. A manual twistlock only locks after a lever is turned. A semi-automatic twistlock closes immediately when the container is placed.
As a result:
an automatic variant requires fewer actions
loading goes faster
the lock is less visible during placement
Manual twistlocks offer more control, while semi-automatic variants are focused on speed.
A semi-automatic twistlock is used when containers are stacked quickly and repeatedly. Automatic locking saves time with every placement.
This type is often used for:
container terminals
ports with high throughput
situations with a lot of loading and unloading movement
The time saved per action leads to a more efficient loading process at larger volumes.
A semi-automatic twistlock is unlocked by operating a cable or mechanism that rotates the inner workings back. This returns the locking points to their neutral position.
On the IF-55, this is done by pulling the steel cable and securing it. Depending on the position, the top or bottom lock is released. We made a clip showing how simple this is.
Once unlocked, the container can be safely lifted and disconnected.
A twistlock such as the IF-55 has a breaking strength of around 500 kN, which equals roughly 50 tonnes. This indicates the maximum force the lock can withstand before failing.
In practice, a twistlock isn't used for lifting, but to hold containers in place. The load comes from movement, wind and the weight of stacked containers.
The stated value is therefore a safety limit, not a working load for lifting applications.
Article number: 10-03-0003-00

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