​Technical Data Stainless Steel ​Tie Rod System

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» ​Profile of Rolled thread.


Strudyna Tensile Rods are roll threaded as opposed to cut thread. Rolled thread offers distinctive advantages over cut thread due to it's inherent production process. The granular flow of the major diameter (tip) & minor diameter (root) are re-formed in unbroken continues lines during a compressed rolling process. This continues compressed granular line resist stripping because shear failures would need to take place across all line rather than a single grain. This is particularly evident in the root section of the thread where compress granular lines increases hardness up to 30%.

Rolling thread

Thread rolling process redistributes excess material in a compact granular formation outwards giving it maximum efficiency over active stress area.

Cutting thread

Cut thread process removes material from original rod making a reduced core active stress area.

The active stress area are also maximized by compressed redistribution of the material, as opposed to material lost. Accuracy on pitch angle, diameter, thread angle, and surface smoothness are also much better achieved by the compression rollings process as opposed to a cut thread which will be dependent on the machine operator. Equally as important is the ability for a machine operator to maintain consistency over long period of machining.

Rolled thread

Granular lines are not broken but enhanced in the tip section (major diameter) and  root section (minor diameter) of a rolled thread process, making  a rolled thread resistance to fatigue before tensile stress can be formed.

Cut thread

Granular lines of a cut thread are completely cut through leaving the threaded roots (minor diameter) exposed as high stress points for tensile stress buildup.

»Tension Thread protection

When the threads are properly engaged in a tie-rod system, the tension carried by the threads is larger than the core active stress area of the rods. For this reason a properly manufactured thread will still rotate with ease even after the tie-rod system has been put through a full breaking load test. It is therefore imperative to always keep the threads protected from any risk of damage in transportation, on site handling or during installation.

 All Strudyna stainless steel tie-rod systems come with a protective PVC cover on top of the threaded part of the rod.  Do not use a cutting knife to remove the PVC as this may result in damage to the thread.

If moisture have formed inside the PVC cover, remove the cover and dry the wet area with a towel and promptly put the PVC cover back on. Always leave the protective PVC cover in place unless installation is being carried out.

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