Fastener hardware: IHF Stretchbolt und IHF Roundnut

Conventional HV standard bolts can be substituted (M36 bis M72 | 1 3/8'' to 4 5/8'')

Fasteners IHF Stretchbolt and IHF Roundnut

Less components, equal surface pressure

The ETA certificated IHF Stretchbolt and IHF Roundnut are specially designed to adapt tensile loads. In contrast to a conventional HV fastener set (bolt, nut, 2 washers) the IHF fastener set consists only of 2 elements:

  1. IHF Stretchbolt
  2. IHF Roundnut

The design benefits are:

  1. The washers are integrated into the bolt head and the nut for an optimal load distribution.
  2. The number of joints is reduced which is beneficial towards the precision of the system. tor
  3. One error source by wrong mounting of the washer is completely eliminated. 

Surface treatments

Surface treatments on IHF Fasteners

When IHF Stretchbolt and the IHF Roundnut are tightened by the method “hydraulic, friction-free and torsion-free tightening” with bolt tensioning cylinders IHF defines the term “IHF Stretch System”.

As the ITH Stretch System loads the bolt connection only in an axial way, there are nearly no limits to possible surface coatings.

Frequently applied coatings are for example:

  • Galvanizing methods
  • Hot-dip galvanizing
  • Zink-lamella
  • PTFE Flour polymer coatings
  • And more

Customer specific coatings are available. Contact us and we would be pleased to give technical support.

Download the product brochure

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