Advantages for the user

Special requirements on corrosion protection, load capacity and material traceability are innovatively solved with the HMR 750 tension rod system. This offers a variety of advantages for architects, structural engineers and contractors.


Unser spezieller Korrosionsschutz

Das Korrosionsschutzpaket des HMR 750 Zugstabsystems gewährleistet mit einer garantierten Salzsprühnebelbelastung von 480 h eine Schutzdauer von C3L bzw. C4M für das gesamte Zugstabsystem inkl. Gewinde.

Bar threads are considered to be the weakest point on galvanised tension rods. European standard EN 19684 regulates the galvanising process of threaded bolts and states that bar threads should be centrifuged immediately after leaving the zinc bath. This is to ensure that there is a suitable layer of zinc (minimum of 50 microns).

Due to length restrictions, processes like these cannot be used on tension rods. Common methods after the galvanising process such as brushing and recutting the threads are used to protect the area against corrosion. There is sufficient doubt that this type of process is reliable due to the fact that both
methods could impede on the galvanised coat thickness, therefore providing insufficient corrosion protection.

HMR Jacob has introduced a new method that ensures long-term corrosion protection on bar threads that represents a galvanised coating in accordance with DIN EN ISO 1461.

HMR bar threads after 480 hours of salt spray test.

HMR tension rod systems are available in the following surface finishes:

  • Self-colour*
  • Galvanised
  • Powder coated
  • Painted
  • Duplex coated

*All fittings are supplied in a galvanised coating.

Bar threads are considered to be the weakest point on galvanised tension rods. European standard EN 19684 regulates the galvanising process of threaded bolts and states that bar threads should be centrifuged immediately after leaving the zinc bath. This is to ensure that there is a suitable layer of zinc (minimum of 50 microns).

Due to length restrictions, processes like these cannot be used on tension rods. Common methods after the galvanising process such as brushing and recutting the threads are used to protect the area against corrosion. There is sufficient doubt that this type of process is reliable due to the fact that both
methods could impede on the galvanised coat thickness, therefore providing insufficient corrosion protection.

HMR Jacob has introduced a new method that ensures long-term corrosion protection on bar threads that represents a galvanised coating in accordance with DIN EN ISO 1461.

HMR bar threads after 480 hours of salt spray test.

HMR tension rod systems are available in the following surface finishes:

  • Self-colour*
  • Galvanised
  • Powder coated
  • Painted
  • Duplex coated

*All fittings are supplied in a galvanised coating.

Since tension rods in exterior applications are subject to weathering and high moisture levels, complex issues associated with corrosion need to be taken into consideration. Particularly fork end connectors with tapped holes leave bar threads exposed to the continuous weathering; which can lead to unsightly corrosion. The HMR system avoids this problem by supplying fork end connectors with blind holes and thus prevents moisture from penetrating the threaded area.

Fork with blind hole.

Another type of corrosion is crevice corrosion, which could occur if there is water retention inside an unsealed thread area. To avoid crevice corrosion, we recommend the use of the HMR sealing compound wherever necessary. The sealant should be applied via the injection holes on the various fittings (fork, lock cover, etc.).

 

HMR sealing compound injected into holes.

Sealed off fork end connection.

Since tension rods in exterior applications are subject to weathering and high moisture levels, complex issues associated with corrosion need to be taken into consideration. Particularly fork end connectors with tapped holes leave bar threads exposed to the continuous weathering; which can lead to unsightly corrosion. The HMR system avoids this problem by supplying fork end connectors with blind holes and thus prevents moisture from penetrating the threaded area.

Fork with blind hole.

Another type of corrosion is crevice corrosion, which could occur if there is water retention inside an unsealed thread area. To avoid crevice corrosion, we recommend the use of the HMR sealing compound wherever necessary. The sealant should be applied via the injection holes on the various fittings (fork, lock cover, etc.).

 

HMR sealing compound injected into holes.

Sealed off fork end connection.

Quality Assurance

Quality and quality assurance are the foundations of our success. Successful product development,
process reliability, continuous monitoring, R&D commitment coupled with an experienced team guarantee the high quality standard of our products.

FEM model shows M16 fork during the development phase (Photo: TU Munich)

                  Unser Zugstabsystem HMR 750 wurde in Zusammenarbeit mit der TU München entwickelt.             

Zugstab mit DataMatrix-Code für eine eindeutige Kennzeichnung.

Your contact person in our house:

Günter Giefing

Tension bar Sales / Sales Austria

Tel. +43 664 3868636
giefing@remove-this.hmr-jacob.de

Klaus Schneider

Dipl.-Ing. (FH)
Sales

Tel. +49 162 2652567
k.schneider@remove-this.hmr-jacob.de