Hydraulic Rod Tensioning System

Hydraulic Rod Tensioning System

Our Hydraulic Rod Tensioning System is a patented enhancement of our line of standard hydraulic nuts and tensioners, which already offer the industry versatility, flexibility and modular design. With our hydraulic rod tensioning system, design-limiting considerations, such as coefficient of friction due to torquing, are no longer a concern. This high temperature tensioner for studs and nuts, eliminates the need for temperature limiting seals, lubricants, and coatings.

The concept of the Hydraulic Rod Tensioning System was born of the need for a tensioning solution that could be retrofitted to existing studs and suitable for high temperature applications. This tensioner offers the market a method of tensioning that does not require special features on the stud for gripping. Using the outside diameter of the nut as a gripping surface for tensioning satisfies this need.

We are also able to offer high load capacity by placing the hydraulic cylinder above the stud and nut which maximizes the hydraulic working area for a given cylinder outside diameter.

Hydraulic Rod Tensioning System Overview

  • High temperature capability
  • High load capacity
  • Minimum footprint required
  • Easily retrofitable
  • Simultaneous tensioning capability
  • Hydraulic separate from nut
  • Stud extension not required
  • Patented design



Hydraulic Rod Tensioning System Features

The Riverhawk HRT Hydraulic Tensioning System is suitable for high temperature nut & high temperature bolt applications and is able to be retrofit to existing installation requirements. High load capacity is achieved by virtue of placing the hydraulic cylinder above the stud and nut maximizing the hydraulic working area.

In operation, hydraulic pressure is introduced via a port in the cylinder. The reactive force thus generated is transmitted through the cylinder and, in turn, through the nut to pull on the stud. In this hydraulic tensioning system, a circle of axial ports passes through the nut. Contained within these ports is a series of rods, which transmit force from the bottom of the piston through a common washer to the flange face. When the stud is tensioned to a predetermined shank stress, a retaining ring threaded on the outside diameter of the nut is spun down into contact with the flange. The retaining ring serves to maintain the separating force between the nut and flange. The load cell portion of the system including the tensioner piston, tensioner cylinder and rods is removed after tensioning is complete. This eliminates temperature limitations that seal materials and oil would impose if they were to remain in the assembly during service, as is the case in other hydraulic nut configurations.

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In addition to the Hydraulic Rod Tensioning System, we also provide:



To learn more about our Hydraulic Rod Tensioning System contact a member of our team. We will be more than happy to assist you with your project needs.

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