Multi-stage hydraulic tensioners

High precision, even load distribution, and exceptional performance

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Technical Specifications
3D cutaway view of a mechanical tensioner showing its internal components and cylindrical structure, and featuring Plarad's powerful multi-stage tension cylinders for enhanced performance.
Optimal handling: easy alignment thanks to a swiveling support, regardless of the screw configuration SAFETY INDICATORS – GREEN: Sufficient bolt insertion depth has been reached; RED: The maximum stroke of the tensioning screw has been reached The removable handle provides a secure grip and protects the hose connections from damage

The slim and versatile PSD, PST, and PSQ series of hydraulic tensioners makes them ideal tools for use in applications with limited radial space.

Visual Overtravel Indicator

The hydraulic unit can be adjusted, rotated, and swiveled 360 degrees

Preventing installation damage through spring-assisted coupling between the rotating sleeve and the hex nut

Removable handle and carrying strap for maximum comfort and safety during transport and use

Suitable for use with tension cylinders connected in parallel

Anti-rotation device between the tension nut and tension bolt using a key

Technical Features at a Glance

Sizes and Performance Classes

  • Available in sizes M30 through M90 and load ratings from 470 kN to 4,200 kN

Maintenance and Handling

  • Cycle Counter: Defining the Maintenance Interval
  • Gear for tightening the nut
  • Optimal Geometry of the Support Surface

Safety

  • Maximum safety thanks to a “fail-safe system”: The end stop limits the piston’s extension (even under maximum load).

Working speed

  • Maximum speed: fast operation thanks to automatic piston return

Durability and Service

  • Durable and sustainable thanks to the connection of the cylinder tubes via a bayonet lock: Components can be easily disassembled and replaced during maintenance.

Examples of Use

A worker in a yellow jacket skillfully operates machinery on a snow-covered, icy surface, demonstrating the performance and precision of the "Powerful Multi-Stage Tensioner from Plarad."
The equipment on the snow-covered mountain, combined with sturdy metal railings set against a clear blue sky, ensures safety and efficiency. Plarad's on-site customer service provides expert assistance for your bolting challenges and is ready to help with any issues that arise in this breathtaking setting.
A row of identical hydraulic tensioners ready for export. They are shown against a workshop backdrop.
Two workers, wearing helmets and safety gear, carefully repair machinery at an industrial facility. They use precision bolting technology, hydraulic tensioners, and torque wrenches made in Germany to ensure optimal performance and safety.
A person expertly attaches a hydraulic torque wrench with large screws to a metal surface, demonstrating the precision and reliability of “Made in Germany” fastening technology and torque wrenches.
A hydraulic tensioner is used to tighten the bolt on a wind turbine.
A technician wearing an orange helmet inspects industrial machinery, carefully examining bolts and hoses while using a Plarad PSD hydraulic tensioner on a wind turbine.

Product Information

Accessories

  • Available in sizes M30 through M90 and load ratings from 470 kN to 4,200 kN
  • Cycle Counter: Defining the Maintenance Interval
  • Gear for tightening the nut
  • Optimal Geometry of the Support Surface
  • Maximum safety thanks to a “fail-safe system”: The end stop limits the piston’s extension (even under maximum load).
  • Maximum speed: fast operation thanks to automatic piston return
  • Durable and sustainable thanks to the connection of the cylinder tubes via a bayonet lock: Components can be easily disassembled and replaced during maintenance.

You can find the right accessories for each product here or in the PSD catalog (PDF).

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