Hanger bolts are essential components in the installation of photovoltaic systems. These innovative bolts provide a stable connection between the substructure and the roof mounting, making them ideal for various roof types and substrates. This article will tell you everything you need to know about the function, applications, and advantages of hanger bolts.

What are threaded rods?

Hanger bolts are special bolts with two different threads: a wood or metal thread at the bottom and a metric thread at the top. This design allows for the connection of wooden beams, metal profiles, or other substructures to fasteners such as rails or mounting brackets.

Applications of threaded rods

Threaded rods are frequently used in the installation of photovoltaic systems, especially in the following cases:

  • Flat roofs: Here they are used to fasten the supporting structure in order to ensure a stable base.
  • Pitched roofs: On tile or corrugated metal roofs, threaded rods ensure a secure and durable fastening.
  • Industrial applications: Hanger bolts are also used in larger PV projects or special solutions.

Advantages of threaded rods

The use of threaded rods offers numerous advantages:

  • Flexibility: Thanks to their special threads, threaded rods are suitable for various materials such as wood, metal or concrete.
  • Durability: Most threaded rods are made of corrosion-resistant stainless steel, which makes them particularly robust and durable.
  • Easy installation: Assembly is straightforward and requires only a few tools.
  • Stable connection: The screws ensure a firm and lasting connection between the roof and the substructure.

Tips for installing threaded rods

To ensure maximum stability and safety, please observe the following points during installation:

  1. Pre-drilling: In harder materials such as concrete or wood, the hole should be pre-drilled to avoid cracks or damage.
  2. Suitable sealing: To prevent water ingress, you should use suitable sealing materials such as EPDM gaskets.
  3. Correct sizing: Choose threaded rods with the appropriate length and thread size for your project.

Threaded rods and photovoltaics: An ideal combination

Threaded rods are the perfect solution for securely mounting photovoltaic systems. They enable precise and stable installation that meets the requirements of modern PV systems. Furthermore, they are particularly resistant to weathering, which further increases their lifespan.

Conclusion

Whether flat or pitched roof, hanger bolts are essential for installing photovoltaic systems. Their versatility, stability, and durability make them the ideal choice for any project. To ensure reliable and professional fastening, more and more professionals are relying on high-quality hanger bolts.

Referenced terms and sources

This existing glossary article was reviewed and approved on 14 October 2026. Time-sensitive information still refers to its original publication context unless the article states otherwise. It does not replace installation instructions or confirm compatibility with a particular roof tile model.

Machine-assisted translation. The German version remains available.

Data sheet and installation guideOriginal source