Hanger bolts may not get much attention, but they play a crucial role in many structural and solar applications. These dual-threaded fasteners are designed to create strong, secure connections between wood and metal components—making them ideal for rooftop solar installations and other heavy-duty setups.

What Is a Hanger Bolt?

A hanger bolt has wood threads on one end and machine threads on the other. This allows it to screw into a wooden surface (like a roof rafter) while providing a threaded stud on top to attach metal brackets, rails, or other hardware.

Where Are Hanger Bolts Commonly Used?

1. Solar Panel Mounting on Pitched Roofs

One of the most common uses for hanger bolts is in solar PV installations—especially on asphalt shingle or wooden roofs. Installers use hanger bolts to:

• Anchor L-feet or mounting brackets to wooden rafters

• Create a waterproof and secure connection point

• Support the rails that hold solar panels

This setup is both durable and adaptable, making hanger bolts a go-to solution in rooftop solar systems.

2. HVAC and Plumbing Mounts

Hanger bolts are also used to install pipe clamps, HVAC ductwork, and other equipment onto wooden structures. Their double-thread design makes them useful wherever a strong wood-to-metal connection is needed.

3. Construction and Framing

In general construction, hanger bolts help connect wood beams with steel supports or structural hardware—often in custom framing or architectural applications.

The Role of SIC Solar

SIC Solar, a manufacturer of solar mounting systems, supplies high-quality hardware including hanger bolts designed specifically for rooftop solar projects. Their bolts are built from stainless steel to resist corrosion, ensure long-term strength, and integrate smoothly with mounting components. When paired with their racking systems, SIC Solar's fasteners provide reliable structural support in even the toughest environments.

Hanger bolts are small, but they do a big job—especially in solar. Whether you’re securing a panel rail to a pitched roof or mounting a bracket to a beam, hanger bolts deliver strength where it counts. And when sourced from trusted manufacturers like SIC Solar, you can count on quality and performance that lasts.