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What is a Knuckle Boom Crane?

The Knuckle Boom Loader Crane

Also called the loader crane or the articulating crane, the knuckle boom crane has changed the way people load and offload in a variety of industries. It looks similar to the traditional straight boom crane, but the knuckle boom crane has two booms; a main boom and an outer boom. These two booms have a knuckle between them, which allows more options for the operator.

Look at your fingers; hold your index finger out straight, and then bend your finger at the knuckles. The knuckle boom crane works in the same manner. The addition of these two knuckles on the crane allows for many more different uses compared to a straight boom crane. These knuckles also make it easier to fold into a smaller size, but at the same time it can extend further to reach loads at a distance. This kind of “fold and extend” ability is missing in the traditional stiff boom cranes.


Tight spaces are no problem for the knuckle boom crane.

Excels in Tight Spaces

For the loading and unloading of heavy cargo and machinery in restricted spaces, the knuckle boom crane has no equal. This kind of crane has proven to be very useful in Europe, where truck size restrictions are stricter, and roads are narrower than North America. However, it is also gaining more popularity in other parts of the world. These types of cranes have been particularly utilized in the transport, construction, forestry, mining, marine, and petroleum industries. They may be small and easier to use in constricted spaces, but that does not make them any less effective because they can be used to lift cargo of up to and exceeding 60 tons. The crane can even be outfitted with a winch for additional lifting options.

How is the knuckle boom crane used? First, it depends on where it will be used. For example, in the construction and transport industry, it is fitted onto a truck; for marine use, this crane is mounted onto a boat. It can also be mounted on a dock or railcar, and its ability to fold up for storage during transport makes it a more versatile option compared to the traditional stiff boom crane.

Advantages of the knuckle boom crane

Greater Payload Capacity

Considering all the different applications that it can be used for; this is a light piece of equipment – light enough for the truck to carry its regular cargo and carry the weight of the mounted crane as well.


The loader crane can be equipped with several different attachments at the end of the boom. Examples of these include buckets, pallet forks, brick/block grabs, log grabs, and more!

No Travel Limitations

It can be installed on your truck; and that means that wherever your truck can fit, your crane will also fit because it is really part of the truck.

Horizontal Lifting

The articulating crane is excellent at lifting cargo horizontally, meaning that it can even be used in low clearance, tight spaces without causing any damage. Minimal space is needed to operate this crane. With the addition of a jib, the possibilities are even greater.

Multiple Install Configurations

It could be on a truck, on a boat, dock, or railcar. Again, it really doesn’t matter where you choose to install it because it is versatile enough to accommodate your needs. For example, on most trucks, the crane is mounted right behind the cab. In others, it is mounted on the rear of the truck to ensure that weight is distributed evenly on the axles.

Easier to Load & Unload

The articulating crane allows the operator to load or unload the cargo with much less vertical clearance required compared to a straight boom crane. The option to rear mount the crane gives the operator the ability to load/unload a trailer towed behind the truck.

Hiab crane with optional jib attachment

What is the lift capacity of an articulating crane?

This depends on the buyer because different buyers have different needs. For example, there are small cranes that can be used to lift loads of as little as one ton while there are huge cranes which have a 60 ton lift capacity. When you are searching for a crane, let us know your lifting requirements and we will find a suitable crane for you

What is the outreach of a good articulating loader crane?

Again, this depends on what you want. For example, some have an outreach of only a few meters, yet others can reach over 30 meters. These are just two examples; there are varying outreach distances for different cranes.

How do I control the knuckle boom crane?

There are many options for the operator, including the remote control/wireless control, top seat control, stand up control, and ground control. With more technology integrated into the operation of cranes today, you can even use a joystick to operate the crane.

What are the most popular loader crane brands?

There are many different brands of knuckle boom cranes available. At Redcrane, our most requested brands are Hiab, Fassi, Palfinger and HMF. Other brands include Atlas, Bonfiglioli, Copma, Cormach, Effer, Ferrari, Heila, IMT, MKG, Pesci, and PM.

Palfinger crane with jib and wallboard attachment

Palfinger loader crane with glass pane attachment

Palfinger knuckleboom crane with bucket attachment

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Photo Credits: Eldert Rademaker‎, Alfredo Baloo Sensasiosuave, Lifting Solutions NY, Florencio Millán González, and Marco Sailer.




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