Hydraulic cylinders

We are among the world’s top manufacturers of hydraulic cylinders, shafts, and other precisely machined components for industrial machinery.

Precision first

Accuracy is the cornerstone of engineering production. Our commitment to strict quality standards has made us a trusted partner for leading global industries—from printing and food processing to energy and mining in extreme conditions beyond the Arctic Circle. We manufacture hydraulic cylinders, shafts, and components based on customer designs or our own technical drawings, including

  • Single-acting hydraulic cylinders and plungers,
  • double-acting hydraulic cylinders,
  • telescopic hydraulic cylinders.

But our expertise goes beyond manufacturing and delivery. We develop complete hydraulic machines and systems, offering full service and refurbishment to ensure long-term performance and reliability.

Our customers

Why choose OSTROJ?

80 years of experience

Leveraging decades of expertise and know-how in underground mining.

In-house production

From development to quality control, everything happens under one roof.

Comprehensive approach

In addition to manufacturing, we offer design services, assembly, and shipment.

Management system

All operations are carried out in compliance with applicable standards.

Precision machining

We offer comprehensive CNC metal machining services, including milling, grinding, drilling, honing, and thorough technical inspection. We also provide surface treatments such as painting, chrome plating, or zinc coating. Whether for single-piece or series production, our experience and modern technology enable us to deliver precision solutions down to the last micrometer.

Up to tolerance grade IT 4
Piston diameter up to 400 mm
Stroke up to 2,500 mm

Thorough technical inspection

The zero-defect strategy is our standard. Thanks to modern quality management systems and technical inspection, we ensure precision throughout the entire production process. We are equipped with state-of-the-art 3D measuring stations and advanced non-destructive testing methods.

Pressure testing
Balancing
Dimensional inspection – 3D measurement
Non-destructive testing of internal welds using ultrasound
Non-destructive testing of internal welds using magnetic testing
Comparative analysis – augmented reality
IWE/EWE welding supervision

References

For nearly 80 years, we have been manufacturing equipment for work both above and deep below the surface. Explore our reference projects.

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Marek Kušnír
Head of Sales, Hydraulics Division

OSTROJ a.s.
Tesinska 1586/66
746 01 Opava, CZ