INOX A2 and INOX A4 adjustable stainless steel hanger bolts are specialized fasteners designed for securing photovoltaic (PV) mounting systems to various roof structures. These hanger bolts combine the corrosion resistance of stainless steel with an adjustable feature, allowing for precise height and alignment adjustments of solar racking systems. They are critical components in ensuring a secure, durable, and properly aligned solar panel installation.

Definition

An INOX A2 or INOX A4 adjustable stainless steel hanger bolt for PV mounting systems is a dual-threaded fastener made from high-grade stainless steel (either A2 for good corrosion resistance or A4 for superior resistance in harsh environments). It features a lag screw thread at one end for secure attachment to roof rafters or purlins, and a machine screw thread at the other. The “adjustable” aspect typically refers to a design that allows the threaded rod section to be moved up or down relative to the base, providing flexibility for leveling and aligning solar rails.

Key Features

• Material: Available in INOX A2 (AISI 304) for standard corrosion resistance or INOX A4 (AISI 316) for enhanced corrosion resistance, particularly suitable for coastal or chemically aggressive environments.
• Adjustable Height: Designed with a mechanism (e.g., a threaded rod with nuts) that allows for precise vertical adjustment, compensating for roof irregularities and ensuring level solar panel installation.
• Dual Thread Design: Features a lag screw thread for secure anchoring into wood battens or rafters, and a metric machine thread for attaching mounting plates, L-feet, or other racking components.
• EPDM Seal: Often includes an integrated or compatible EPDM rubber washer to ensure a watertight seal around the roof penetration, preventing leaks.
• Torx or Hex Drive: Typically includes a drive on the lag screw end for easy and secure installation using standard tools.
• Durability: Stainless steel construction provides excellent strength and long-term resistance to weathering, UV exposure, and temperature fluctuations.

Advantages

• Superior Corrosion Resistance: INOX A2 and especially INOX A4 stainless steel offer excellent protection against rust and environmental degradation, prolonging the life of the PV system.
• Precision Alignment: The adjustable feature allows installers to easily level the solar racking system, ensuring optimal panel performance and aesthetics.
• Watertight Installation: EPDM seals prevent water ingress, maintaining the integrity of the roof structure.
• Secure and Stable Mounting: Provides a robust connection between the solar array and the roof, capable of withstanding wind loads and other environmental stresses.
• Versatility: Suitable for various roof types (e.g., tile, slate, corrugated) when combined with appropriate flashing and adapters.
• Long Lifespan: High-quality materials and design contribute to a long service life, minimizing maintenance.

Applications

• Residential Solar Installations: Widely used for mounting solar panels on residential rooftops, particularly where precise leveling and long-term durability are crucial.
• Commercial PV Projects: Utilized in commercial and industrial solar arrays on suitable roof types, providing a reliable and adjustable fastening solution.
• New and Existing Roof Structures: Applicable for both new roof construction and retrofitting solar systems to existing roofs, ensuring a secure and adjustable mount.
• Tile and Slate Roofs: Often used with appropriate roof hooks or flashing systems to integrate seamlessly with these roofing materials while anchoring into the underlying wood structure.
• Coastal and Harsh Environments: INOX A4 versions are particularly recommended for installations in corrosive environments, such as near coastlines or industrial areas.