Leading expert of custom hydraulic cylinders - celebrating 60 years

Hydraulic cylinder experts with
six decades of experience.

Our automated, fast and flexible production is truly world-class. We constantly develop our operations by listening to our customers and cooperating closely with our stakeholders. Beyond all else, we want to be the trusted, groundbreaking partner our customers truly need. We have always served the World’s leading and most desirable OEMs in the most demanding segments. And to be the partner worthy of the best, we need to be the best.

Customer satisfaction is our passion.

Read more about us and our story here.

What is Hydroline? Who are we?

Hydroline Oy designs and manufactures durable, heavy-duty hydraulic cylinders and offers lifecycle services to them. Our automated, fast and flexible production is truly world-class. We constantly develop our machine base and operations to meet customer-specific-needs and remain leaders in the industry. Beyond all else, we want to be the trusted, groundbreaking partner our customers truly need.

In addition to the customized cylinders, Hydroline offers piston accumulators, system configurations, and versatile services such as repair and manufacturing services. The modern production facilities are located in Vuorela, Siilinjärvi (Finland) and in Stargard (Poland), where the production started in 2014. The core values of Hydroline are guiding its business strongly that are commitment, sustainability, interaction and people.

We have been a family-owned company throughout our history, since 1962.

What do we offer?


Our custom made, fully tailored hydraulic cylinders are designed specifically to your needs. As a leading hydraulic cylinder manufacturer, we offer hydraulic cylinders and solutions to fit the needs of various different segments.


Hydroline LEO – the World’s first and only intelligent tool for linear actuator monitoring. Based on a patented technology, LEO gives you the possibility for even more efficient, ecological and contented information about your machine.


Hydroline’s innovative and reliable R&D team constantly searches solutions to the most current technological problems. Looking for monitoring solutions for linear actuators? Read more!


Hydroline celebrates 60th anniversary

03.01.2022 | Hydroline

In 2022 we are celebrating our 60-year-long journey. Together have grown from a small, one-man's business to a leading international operator in the field of custom hydraulic cylinders. Our story began in 1962 when Helge Laakkonen founded a one-man metal lathing shop to the basement of his home in Niirala, Kuopio. It wasn't until the late 1960's when Helge hired his first employee to join the business.

New funding to support Hydroline’s growth and development

05.11.2021 | Hydroline

During the past years, Hydroline has strongly sought for growth and development and has now expanded and diversified its ownership base. In addition to current owners increasing their investments, the new Chairman of the Board, Jan Mattlin and Tesi (Finnish Industry Investment Ltd) have joined as the new owners of the company. As the market and order backlog have remained well and the demand continues to grow, both current owners and new investors have a great confidence in the company’s expertise, personnel and future prospects.

Mikko and James - Heart of Finnishness 2

21.07.2021 | Hydroline

The ultimate background for this is a megatrend for reducing the environmental impact. Displacing oil in cylinders completely with electromechanics, will reduce the environmental impact. In addition to eco-efficiency, cylinder maintenance will become easier and the weight of machines will be reduced. This is why the second part of Mikko and James - Heart of Finnishness focuses on explaining the reasons behind our decision to start looking for ways to get rid of the use of oil.

Interested in our services? Contact us!

Manu Leinonen

VP design and R&D

Mikko Laakkonen

Member of the Board


7 steps to hydraulic cleanliness

14.04.2021 | Hydroline

Manufacturing hydraulic cylinders requires specific processes to prevent a cylinder from contributing failure to other system components. It is a common scenario that microscopic solid particles can cause a component failure for machinery using hydraulic systems. According to industry experts, contamination causes approximately 60% to 90% of all hydraulic system failures. The malfunction may be intermittent and requires extensive troubleshooting to identify the faulty component.

How to design a hydraulic cylinder?

17.02.2021 | hydroline

The hydraulic systems date back as far as over 4,000 years ago in Ancient Egypt. They initially applied the principles of fluid hydraulic to the complicated canal systems used in watering. Other civilizations, including the Greeks and Romans, used the same basic principles to develop water-powered structures and devices like the water clock and water wheels. Since then, the fluid power universe has become a little more complicated. Fluid power has been used for Centuries to create energy to generate movement and force.

Understanding ISO codes in hydraulics

31.03.2021 | Hydroline

While working in the hydropower industry, most probably you have stumbled upon the term ISO 4406? What the code is referring to is ISO 4406:1999 standard for oil cleanliness. In 1999, The International Organization for Standardization developed a system ISO 4406:1999. This system rate and quantify the number of particulate contamination levels per milliliter of fluid at three sizes; larger than 4-, 6-, and 14 microns.

Find us in social media!