Semi-automatic twistlock: t-5

Semi‑automatic twistlocks

are container securing devices used to connect containers together during stacking and sea transport. They engage automatically when containers are placed and are released manually, reducing handling time while maintaining secure container locking on board vessels.

How does a semi‑automatic twistlock work?

A semi‑automatic twistlock locks automatically when a container is lowered into position. Unlocking is performed manually using a release mechanism, allowing controlled and safe disengagement during unloading.

When is a semi‑automatic twistlock preferred

Semi‑automatic twistlocks are commonly used on container vessels where fast port operations, reduced manual handling, and compliance with lashing regulations are required.

Why are semi‑automatic twistlocks used on container vessels?

Semi‑automatic twistlocks are used to improve operational efficiency and safety during container handling. They reduce manual intervention at height while ensuring reliable container locking under dynamic sea conditions.

The CONTECH® T‑5 semi‑automatic twistlock is an example of this type of securing device, designed for reliable container locking during maritime operations

Operation:

• Step 1: Pull the orange handle knob to its maximum outwards & upwards.
  Top cone is open and handle can be secured in mouth piece.Wire handle is facing upwards when secured as indicated on the right Figure. (pictures 1 & 2)

• Step 2: Insert yellow top cone into lower corner casting of the upper container and release handle of mouthpiece. Top cone will lock automatically by spring action when releasing the handle. (picture 3)
• Step 3: Upper container can be lowered, lower cone of the semi automatic twistlock will twist and align with body by the pressure of the upper container. Lower cone is pushed into upper corner casting of lower container. (Pictures 4 & 5)

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• Step 4: Upper container is connected to lower container, lower cone of the semi automatic twistlock will lock itself by spring action. Upper container is now fully connected and secured to lower container. (picture 6)

Maintenance:

It is recommended to inspect and clean the twistlock on a regular basis, this includes greasing the movable parts and checking the function of  the mechanism and spring action.

Twistlocks with damaged cones of bodies are to be scrapped. Other damaged elements (Wire handle, bolts,..) can be replaced as described in the repair instruction.

Repair:

By removing the bolts and nuts, the body halves can be separated. Cone assembly, spring and wire handle can be removed.

For repair or maintenance of the semi automatic twistlock we can provide a service jig.

Spare parts & service jig:

• T-5/01 Wire handle                                                 T-5/02 Right body part
• T-5/03 Mouth piece                                                T-5/04 Left body part
• T-5/05 Spring                                                          T-5/06 Mid cone + spring
• Bolt M10x40mm                                                      M10 nut
• Z-11 Service jig for T-5

Frequently Asked Questions about Semi‑Automatic Twistlocks

What is a semi‑automatic twistlock?

A semi‑automatic twistlock is a container locking device that engages automatically during stacking and is released manually during unloading.

What is the difference between manual and semi‑automatic twistlocks?

Manual twistlocks require manual locking and unlocking, while semi‑automatic twistlocks lock automatically and only require manual release.

Are semi‑automatic twistlocks suitable for maritime transport?

Yes, semi‑automatic twistlocks are widely used in maritime transport to ensure secure container stacking and efficient cargo handling.

what is the weight of a semi-automatic twistlock?

Depending from which producer around 6Kg

How can a semi-automatic twistlock be stored onboard a seagoing vessel?

The most common way to safely store a semi-automatic twistlock is to use galvanized steel bins as the Z-8/2 series

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