Bolts and tensioning systems

Monolithic 8-tensioner ring. Reduce machine downtime with hydraulic tensioning.

In maintenance, time is money. But if basic tasks such as bolt tightening are not carried out correctly, this can lead to failure of the bolted assembly. This can be avoided with our hydraulic tensioning systems, which apply precise tightening forces to bolts. They apply high force without torsional stress or friction, with high accuracy and repeatability. Hydraulic tensioners are available for everything from standard bolts to special applications.
 
Tensioning systems are commonly used in a variety of areas such as steam turbines and ship propellers. We have dedicated products for both applications. In steam turbines, our Cold Tight systems reduce downtime each time a steam turbine is opened or closed, avoiding the need for lengthy cooling periods. Likewise, using our oil injection method with hydraulic rings and propeller nuts simplifies and speeds up propeller mounting and dismounting on shafts.
 
We have also developed our range of Supergrip bolts, which are easy to install and remove. They are used to connect rotating flanges.
 
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Features

• Hydraulic tensioning applies precise tightening forces to bolts
• Systems are available for a wide range of bolted assemblies
• Cold Tight systems reduce downtime each time a steam turbine is opened or closed

Benefits

• All systems reduce maintenance time
• Hydraulic tensioning increases accuracy and repeatability
• Supergrip bolts are easy to install and remove