Hydraulic Cylinders – Piston Ø 125 mm

Extreme power for special tasks. 125 mm diameter hydraulic piston cylinders are the foundation of heavy construction machinery and industry. They generate a force of 25–40 tons (depending on the pressure). The robust design, chrome-plated piston rods, and reinforced glands guarantee reliability in the most challenging working conditions.
Skip to results list
5 items

Filter

Hydraulic cylinders Ø 125 mm – Power for Industry and Agriculture

In this category, you'll find double-acting hydraulic cylinders with a cylinder (piston) inner diameter of 125 mm . These are heavy-duty components designed for applications requiring significant force reserves and resistance to pressure shocks.

Powerful performance

The 125 mm diameter cylinder is a powerful tool. The effective piston area of ​​this size allows for impressive forces even at standard hydraulic pressures:

  • At a pressure of 180 bar : Extension force approx. 22 tons .
  • At a pressure of 250 bar : Extension force approx. 30 tons .
  • At a pressure of 320 bar : Extension force of nearly 40 tons .

Design and Construction

The actuators we offer are based on the highest quality components to withstand continuous operation:

  • Cylinder: Tube honed to H8 tolerance, ensuring perfect tightness and long seal life.
  • Piston rod: Surface-hardened and chrome-plated steel rod (typically 70 mm to 90 mm in diameter for this piston size), resistant to corrosion and mechanical damage.
  • Gland: Equipped with sealing and scraper packages (often from brands such as Trelleborg or Hallite) to protect the cylinder interior from dirt.

Application

Cylinders with a diameter of 125 mm are too large for lightweight machinery. Their natural habitats are:

  • Heavy construction equipment: Excavators, loaders, bulldozers (as main, arm or bucket cylinders).
  • Hydraulic presses: For metal forming, baling presses or high-power workshop presses.
  • Forestry and Agriculture: Reinforced log splitters, tillage machines, heavy-duty tipper trailers.
  • Industry: Scissor lifts, loading ramps, crushing systems.

FAQ: Hydraulic Cylinders – Piston Ø 125 mm – Questions and Answers
1. What is the pressing force (lifting capacity) of a 125 mm piston diameter actuator?

Cylinders with a 125 mm piston are equipment for extreme industrial loads. The working surface of such a large piston is as much as 122.7 cm². Thanks to this, they generate gigantic forces:

  • At an operating pressure of 160 bar, this cylinder generates a thrust of approximately 20 tonnes (approx. 20,024 kg).
  • At a standard industrial pressure of 200 bar, the thrust increases to 25 tonnes (approx. 25,030 kg).
  • In heavy systems operating at 250 bar, the 125 mm cylinder achieves a crushing thrust of over 31 tonnes!
2. Where are actuators with a lifting capacity of 20-30 tons used?

These types of linear drives are designed exclusively for the heaviest stationary and mobile machines. Main applications include:

  • Industrial hydraulic presses: Press brakes, stamping presses, as well as powerful balers and shear balers for scrap metal.
  • Heavy construction and mining machinery: Main arm cylinders in the largest excavators (e.g., in open-pit mines) and loaders.
  • Civil and hydraulic engineering: Lock lifting mechanisms, powerful port cranes, and specialized shipbuilding equipment.
3. How to prevent the bar from bending (buckling) under 30 tons of pressure?

Pushing 30 tons is the ultimate test of steel's strength. Buckling (i.e., the bending of a rod under axial stress) is a critical threat here.
Therefore, in Ø 125 mm cylinders, extremely thick piston rods are used – usually from 60 mm to even 80 mm. In the case of machines with a very long stroke (exceeding 1000 mm), in addition to the thickest rod, the system must be perfectly aligned, and the load should be guided on additional mechanical guides to relieve the cylinder of lateral forces.
4. What pump and manifold performance does a 125mm cylinder require?

This cylinder is a powerful oil "reservoir." Connecting it to a standard pump (e.g., 40 l/min) would result in the machine operating at an irritatingly slow speed.
To ensure a smooth and reasonable extension speed for the 125 mm cylinder, the system must be powered by a pump with a capacity of at least 80 to 150 l/min. Such a flow requires the use of large electro-hydraulic directional control valves (e.g., CETOP 07 or CETOP 08 series) and large-diameter hoses (e.g., DN20 or DN25) to avoid oil overheating.
5. What fixings can withstand a force of 30 tons?

Traditional mountings would immediately fail. The 125 mm bore cylinders are equipped with giant welded lugs with pressed-in heavy-duty spherical plain bearings for pins with a diameter of Ø 50 mm to Ø 70 mm. These bearings are essential to compensate for machine frame deformation during operation, protecting the lug and piston rod from bending forces.