Manual Twistlocks

A twistlock and corner casting are now the standardized method for securing shipping containers internationally. Twistlocks were developed in the 1950s by American engineer Keith Tantlinger, who is responsible for revolutionising shipping practices.

Currently it is possible to obtain manual, semi-automatic or automatic twistlocks. As you would expect, manual twistlocks need to be locked and unlocked manually using operating rods, while semi-automatic and automatic twistlocks automate some of the process.

Manual twistlocks are frequently used when securing second tier containers in double stacking configurations.

How to Use Manual Twistlocks

To use a manual twistlock, simply place the bottom cone of the lock in the top corner casting of a container that has already been loaded into place. At this point it should be in the unlocked position, with the operating rod either to the left or the right, depending on whether it is a left or right operating twistlock.

When a second container is lowered on top of the first, the top cone of the twistlock will slot into the open mouth of the lower corner casting of the second-tier container. When the second container is in place, move the operating rod from right to left, or left to right, depending on the lock configuration.

A container should be secured with four manual twistlocks, one in each corner of the connected containers. Select right to left or left to right locks so that all operating rods sit in the same position when locked. This makes it easier to visually ensure that containers are locked in place, and to unlock the containers in batches when it is time for removal.

To unlock the containers for removal, return the operating rods to their original position before removing the top container.

Features of a Good Manual Twistlock

A good quality twistlocks should include a number of essential features:

  • Meet ISO strength requirements and other specifications;
  • Properly secured operating rids that do not fall down from the container;
  • Easy to determine whether the twistlock is locked or unlocked from the position of the handle;
  • Feature shock absorbers;
  • Compatible with both hinged head and fixed head lashing rods;
  • Symmetrical to be used upside down when required;
  • Easy to maintain, assemble and disassemble.

Manual Twistlock Maintenance and Repair

All twistlocks should be inspected, cleaned and lubricated on a regular basis to ensure that they are safe for use. If during inspection, one of the cones of the lock is found to be damaged, the lock can no longer be used and should be disposed of. All other lock mechanisms are replaceable, and parts can be secured from the supplier.

Manual Twistlock Supplier

Here at Ocean Link we are the leading container lock supplier worldwide. Our expert staff can advise on exactly which type of container lock offers the best security and the best value for your particular needs. While our head offices are in Australia, we can ship products to ports around the world. We currently ship to the United States, Australia, Europe and China.

Ports in the United States

There are currently approximately 360 active ports in the United States, and many of them number among the busiest in the world. The Port of Los Angeles located in San Pedro Bay, California is the largest on the west coast and is responsible for the majority of transpacific trade. On the east coast the Port of New York and New Jersey is the largest, offering access to one of the most concentrated consumer markets in the world. The ports of Savannah in Georgia, of Seattle and Tacoma in Washington state, and of Huston in Texas are some of the country’s other leading US ports.

Ports in Australia

Despite its relatively modest population, Australia is serviced by around 50 ports. The largest ports are unsurprisingly in Sydney and Melbourne, but the third largest port, in Brisbane, is also the fastest growing container port in the country.

Ports in Romania

Romania is services by 25 ports located in the Black Sea, the Danube Black Sea Canal and the Danube River. The Port of Constanta is the largest on the Black Sea, the largest in Romania, and the 17th largest in Europe.

Ports in France

France is served by more than 330 ports. The Marseille Fos Port is the country’s busiest handing 88 million tons of cargo in 2011. La Havre follows closely receiving 75 million tonnes of cargo in the same year, but is in fact the largest container port in the country.

Port of Hong Kong

While Hong Kong’s small size means that it is served by only one port, it is one of the busiest in the world in terms of all three main categories: shipping movement, cargo handled, and passengers carried. Its location on the South China Sea and the naturally deep waters of Lake Victoria provide ideal shipping conditions.

Ports in China

China has 34 major ports, but over 2,000 minor ports spread across the country. The five busiest ports serving the economic superpower are the ports of Shanghai (the world’s busiest container port), Shenzhen, Ningbo, Qingdao and Guangzhou.

Dovetail Twistlock

Shipping and handling containers can be quite tricky, which is why it is highly significant to secure them properly. If you are in the shipping or even storage industry you are well aware of the fact that container locks are a vital piece of equipment. Different locks are available, and they are made of heavy-duty materials and constructed in a way to provide support, safety, and the ease of connecting container with other structures. Dovetail twist locks are widely used for safe and easy securing of bottom containers to hatch covers. Another application of these locks is in holds where a raised socket could cause an unwanted obstruction. Dovetail twist locks are made of cast and forged steel and are hot dip galvanized. In this post, we’re going to focus on boltable and weldable dovetail twist locks.

Boltable dovetail twistlock 

Boltable dovetail twist lock

Boltable dovetail twist lock is one of the most useful container locks that make it easier to ensure the safety and protection of the containers and their contents. Boltable locks got their name because you can bolt them to any surface and they will effectively secure a shipping container in its place, prevent it from moving, and thereby protect both container and things that are in it. Although very heavy and rigid, boltable dovetail twist lock allows easy and fast connection of the container to any other structure. These locks are made to act fast and get the job done instantly, without too much fuss. When locked in the position, the direction of the handle on this type of dovetail twist lock indicates whether containers are locked and secured in place. Although the primary application of boltable dovetail twist lock is in the shipping industry, they can also work in static uses too. The lock features 16mm steel plate which is welded at the very base, and it features four holes that secure it in place and prevent any sort of movement of the lock and container. The galvanized finish adds to the quality and durability of this twist lock meaning this is a great investment.

Weldable dovetail twistlock 

Weldable dovetail twistlock

In addition to the above-described boltable twist locks, dovetail twistlocks can also be welded. So, how do they work? Weldable dovetail twist locks are typically utilized by welding the base to the existing steel or any other structure where you want to connect and secure the container. These particular twist locks have a flat base, and they also allow you to install a twist lock slipper that enables you to slide the lock-in and out of its place whenever it is necessary. This is particularly important for the cases when your goal is to maintain a lower profile when the container is not on site at that specific moment. In other words, we have the option to either slip these locks into the slipper frame or to weld them directly, depending on the needs, preferences, surface, and overall use. You can use these locks to secure and connect a container to the truck, for example. That way, the container will not move during the transportation which would otherwise cause significant damage to both container and its content. Weldable dovetail twist locks are load rated to 500kN, and just like boltable locks, they are galvanized to withstand even the most extreme conditions and environments.

Dovetail twist lock supplier

The shipping industry is continually on the rise which also increases demand for adequate ways to protect and store containers. After all, containers need safety and protection even in the harshest conditions regardless of whether they are being transported or remaining at one place. Dovetail twist locks are made to provide ease of use, ultimate safety, and practical handling. However, in order to get the most out of container lock, you do need to pay attention to the supplier you choose. Not all suppliers provide locks of equal quality. Ocean Link is the world’s leading supplier of locks thanks to the high-quality of items and their durability as well as versatility. Below, you can see the ports where we provide our dovetail twist locks.

Dovetail twist locks supplied to ports in the USA

The US contributes a great deal to world consumption, so it comes as no wonder their ocean freight industry is vital for the economy. This country has over 360 commercial ports, which is a staggering number.

We are capable of supplying twistlock to almost all ports in the continental US, including Port of Los Angeles, Port of Long Beach, Port Authority of New York & New Jersey, Port of Seattle and Tacoma, Port of Savannah, Port of Virginia, just to name a few.

Dovetail twistlocks in Australia

Australia’s remote geographic location means the country relies heavily on the importation of various goods. We serve and supply all four major cargo centers at Melbourne, Sydney, Brisbane, and Fremantle.

We supply dovetail twistlock to ports in Romania

Ports in Romania have a significant role in the economy of this European country as they are an important factor in the import and export of many goods.

We supply the Port of Constanta, Port of Tulcea, Port of Midia, Port of Basarabi, Port of Sulina, among others in Romania. .

Boltable and manual twist locks supplied to ports in France

France has one of the strongest economies in Europe and the whole world for that matter. We serve and supply most important ports including Port le Verdon, Port Provence, Port of Bonifacio, Port St. Louis du Rhone, Port of Fos-sur-Mer, and many others.

Dovetail twistlocks at port of Hong Kong

Port of Hong Kong is located by the South China Sea, and it is considered to be one of the busiest and most efficient international container ports in the world. For instance, the port handled 19.6 million TEUs of containers in 2018, which is absolutely amazing.

Dovetail twistlocks in China

China has the world’s strongest economy right now, they ship their goods worldwide, but they also import stuff meaning their ports are busy, efficient, and numerous. Some of the busiest ports in China are Port of Shanghai, Port of Shenzhen, Port of Ningbo, Port of Qingdao, and others.

Dovetail twist locks can be bolted or welded, and in addition to the ease of use, they also prove to be incredibly practical in securing containers during shipping and in the static environment too. Ocean Link is one of the most reputable suppliers of these important locks, and our locks are found across the globe. 

Shipping Container Locks

A twistlock is considered one of the most popular and powerful locks that are used to secure containers on ships, as well as to assist in connecting containers to trucks, busses, and other vehicles. The lock consists of two parts – including a male and a female connector. The female connector does not include any type of moving parts, but rather a solid construction that comes with a hole at the bottom of the connector. The male connector, however, does contain a moving part that is fitted into the oval hole that is found on the female connector. Once fitted, the moving part is rotated to secure its fitment.

Container Locks For Ships

Even though there is a standard design for twistlocks that were originally developed in the 1950s, companies have taken the design and made certain modifications. This allowed for a more extensive range of locks to be released – providing specialized functionality that is exceptionally useful for securing containers on ships. Different types of twistlocks are now found on the market, and it is important for companies to understand the functionality of each. This will ultimately ensure the right type of lock is chosen for the particular containers being secured. This will also help to lower the risks involved with the shipment of these containers.

Double Ended Container Twist Locks

Double Ended Container Twist Locks

Double ended container twist locks were originally developed with the idea of providing an effective mechanism for cases where containers are stacked vertically. The load rate of double ended container twist locks is 500kN. In the majority of cases, this type of lock will be constructed with forged steel material to provide a sturdy product for stacking up to 16 containers on top of each other. A handle is located on the front region of a double ended container twist lock – this handle is not only used as a locking mechanism, but also provides a clear way of having a visual representation in terms of whether or not the containers are appropriately locked.

Shipping Container Weldable Twist Locks

Shipping Container Weldable Twist Locks

Shipping container weldable twist locks are exceptional when it comes to durability. This type of lock is usually galvanised, which helps to significantly enhance the overall performance of the lock and makes it a more secure option compared to some other options. The lock measures about 175mm x 140mm x 135mm. These locks have a 500kN rating. They are also compliant with both Australian and European standards, ensuring the locks can be used in most situations. There are two types of shipping container weldable twist locks – including an option where the two structures are welded together. The other option includes the use of slipper shoes.

Bolt On Twist Locks

Bolt On Twist Locks

Bolt on twist locks are also durable and made to last for a significant period of time. These locks are relatively unique and were made to assist in bolting down a container to a specific area, such as to a region on a ship or another type of structure. This is a type of static twist lock that is usually not frequently locked and unlocked, but rather bolted in order to support a longer-term storage of a container. A 16mm steel plate is utilized with a bolt on twist lock. The lock has four holes added to its structure, which provides for an easier connectivity. Bolt on twist locks is often utilized when containers need to be bolted to concrete slabs.

Side Twist Locks

Side Twist Locks

Side twist locks are often utilized in cases where multiple containers will be added on top of each other. The locks are installed on the sides of the shipping containers. In the majority of cases, the lock will be connected to both the container and the floor on which the container needs to remain. There are, however, other uses for side twist locks. In some cases, the lock may be installed to the upper container in a row. This allows for rooves, aerials, and other structures to be easily attached. When multiple floors of storage are required, a side twist lock may also be used to avoid the need for additional legs to be provided for support.

Transverse Double Ended Shipping Container Twist Lock

Transverse Double Ended Shipping Container Twist Lock

The transverse double ended shipping container twist lock has many similarities to the standard double ended shipping container twist lock, but with some unique features. Similar to the standard option, the transverse double ended shipping container twist lock was designed to allow multiple containers to be stacked on each other. This particular option, however, provides a 90-degree offset in its rotation. In turn, it is possible to mount containers on top of each other at a 90-degree angle, instead of having to ensure an accurate parallel placement of the containers that are being stacked.

Semi Automatic Twist Lock

Semi Automatic Twist Lock

A semi automatic twist lock is used in a similar way as a standard double ended shipping container twist lock. The difference, however, is the fact that this type of lock has a mechanism that will automatically lock upon connection between the male and the female parts of the structure. The lock will have a structure on both the bottom, as well as the top regions of the container’s corners. Containers can be stacked on top of each other. These locks have a 10-tonne load rating, making them ideal for storing multiple empty containers.

Twist Locks For Trucks

Twist locks are not only useful in cases where containers need to be added to a ship, but can also come in handy for road vehicles – particularly for trucks. There are a number of different twist locks available that can be used for trucks, depending on the specific purpose that the lock will serve on the truck it will be installed on. In many cases, the twist lock will assist in securing a specific container onto the truck, avoiding the container from moving or falling off while the truck may be in motion.

Truck Twist Locks

Truck Twist Locks

A standard trust twist lock is considered one of the best options that can be utilized for securing a shipping container onto a trailer. This can be useful during the transit of the shipping container. The lock has a special construction that makes it an ideal option for being installed on a truck’s trailer and can usually be easily welded on the bed of the trailer. There are different options available in terms of truck twist locks, including both long handle options and short handle varieties. In some cases, truck twist locks will be used to secure a container to a caster or trolley as well.

Tilt Tray Twist Lock Lift Lock

Tilt Tray Twist Lock Lift Lock

While a standard trust twist lock is appropriate for normal trailers, there are cases where they will not be the right option. In cases where a truck is equipped with a tilt tray, a tilt tray twist lock lift lock would be needed. This type of lock is equipped with a sprung plate. This allows for the pins to be placed into an upright position instead of downward, which helps to accommodate the tilt tray equipped in the truck. Once fitted, they provide a much safer approach to both loading and unloading shipping containers, without exposing the user to the same dangers as a standard truck twist lock would in case the truck has a tilt tray.