Hanger bolts designed for attaching solar panel mount structures to steel purlins or beams are specialized fasteners that provide a secure, weather-sealed connection. Unlike traditional hanger bolts used for wood, these are engineered with specific threads and components to interface effectively with steel while also accommodating the requirements of PV mounting systems. The inclusion of a nut and an EPDM washer is crucial for both secure fastening and watertight sealing.

Definition

A Solar Panel Mount Structure Hanger Bolt for Steel with Nut and EPDM is a specialized fastener, typically made from high-grade stainless steel, designed to anchor solar racking systems onto steel roof structures (e.g., steel purlins, C-channels, or I-beams). It features a robust threaded shaft, often with a self-tapping or machine thread suitable for steel, and is accompanied by a nut for secure tightening. The EPDM (ethylene propylene diene monomer) washer is an essential component, providing a durable, watertight seal at the point of penetration or attachment to prevent leaks and protect the underlying roof structure.

Key Features

• Material: Usually made from high-grade stainless steel (e.g., A2/AISI 304 or A4/AISI 316) for excellent corrosion resistance and strength.
• Thread Designed for Steel: Features a thread type optimized for steel applications, which could be a fine machine thread for pre-drilled holes, or a self-tapping thread for direct installation into certain steel thicknesses.
• Robust Construction: Engineered to withstand the weight of solar panels, wind loads, and other environmental stresses over the lifespan of the PV system.
• Nut Included: Comes with a matching stainless steel nut (and often a flat washer) to securely fasten the mounting bracket or L-foot to the hanger bolt.
• EPDM Washer: An integral component that creates a flexible, UV-resistant, and watertight seal, crucial for preventing water ingress into the roof structure.
• Variable Lengths: Available in various lengths to accommodate different steel profiles and insulation thicknesses.
• Easy Installation: Designed for efficient and secure installation into steel members, often using standard tools.

Advantages

• Secure Anchorage to Steel: Provides a strong and reliable connection point for solar mounting rails to steel roof structures, ensuring system stability.
• Watertight Seal: The EPDM washer guarantees a durable, long-lasting seal, protecting the roof from leaks and water damage.
• Corrosion Resistance: Stainless steel construction offers superior resistance to rust and degradation, vital for outdoor and long-term applications.
• High Load Bearing Capacity: Designed to carry the significant loads associated with solar panels and withstand harsh weather conditions.
• Durability: Made from materials that can endure decades of exposure to UV radiation, temperature extremes, and environmental stresses.
• Compliance: Helps ensure the PV installation meets building codes and structural integrity requirements.

Applications

• Commercial and Industrial Rooftops: Primarily used on large-scale commercial and industrial buildings with steel roof structures (e.g., warehouses, factories, office buildings) for mounting extensive solar arrays.
• Metal Roof Solar Installations: Ideal for specific types of metal roofs where the mounting system needs to be anchored directly into steel purlins or girts beneath the roofing material.
• Carports and Awnings: Employed in the construction of solar carports and awnings where the supporting structure is made of steel.
• Ground Mount Systems: Can be used for securing components of ground-mounted solar arrays that utilize steel foundations or framework.
• Any PV System Requiring Steel Anchoring: Applicable wherever solar modules need to be securely fastened to a primary or secondary steel structural element.