How Does Tensioning Work?

Tensioning is an alternative method of bolting that provides accurate and repeatable performance. When utilized it involves the direct axial stretching of a bolt to achieve preload. Contrasted with traditional torqueing methods, hydraulic tensioning also provides the ability to simultaneously secure studs in one step.


Tensioning Benefits


Regardless if bolt geometry and joint stiffness is known, the load transferred during tensioning is calculable. Bolt tensioning with stretch control technique can result in a preload scatter at low as +/-5%, compared to torque control methods that yield preload variances of +/-30%.


By utilizing a purely axial force to stretch the bolt, friction is eliminated thus preventing torsional wind up of the stud. Traditional torque methods tend to increase friction and wind up, which can lead to a joint loosening over time.


Galling is known as a form of wear caused by friction and adhesion of two surfaces, which creates a high temperature environment. This can cause severe damage to bolt threads, leading to expensive repair. Tensioning eliminates high pressure sliding surfaces that occur in the threads and bottom of the nut during installation and removal.


Multiple tensioners can be linked together and powered by a single pump kit. Elastic interactions between adjacent bolts are greatly reduced, thus resulting in higher preload accuracy and reduced installation times.

Tooling & Hardware

Standard and customized tensioners designed to secure studs across a variety of applications including but not limited to pipe flanges, turbine cases, and coupling hardware.

Hydraulic Pump Kits

A  selection of manual, air, and electric pump kits designed for any hydraulic application requiring pressures up to 40,000 psi. For use as an accessory for our tensioning and coupling installation product lines.