Enerack hanger bolt 10x300 + plate

Enerack Ace Screws 10×300 + Adapter for Mounting Rail

The Enerack Ace Screw is a threaded fastener designed to be screwed into a wooden rafter, which is used to directly mount the mounting rail via an accompanying adapter. It is an accessory of the Enerack mounting system—not a standalone inverter or electrical component, but a mechanical fastener, typically used for shingle roofs and certain metal roof installations. The 10×300 mm size is the longer version, designed for thicker roof structures or situations requiring deeper penetration.

Enerack Ace Screws 10×300 + Adapter for Mounting Rail

The Enerack Ace Screw is a threaded fastener designed to be screwed into a wooden rafter, which is used to directly mount the mounting rail via an accompanying adapter. It is an accessory of the Enerack mounting system—not a standalone inverter or electrical component, but a mechanical fastener, typically used for shingle roofs and certain metal roof installations. The 10×300 mm size is the longer version, designed for thicker roof structures or situations requiring deeper penetration.

What is it used for?

It is primarily recommended for solar panel installations on asphalt shingle roofs, where the screw driven into the rafter bears the system’s entire load. You should choose the 300 mm version if, due to the thickness of the roofing material and insulation, the shorter (200 mm) version does not penetrate deeply enough into the load-bearing wooden structure.

Typical applications include shingle-roofed single-family homes, smaller C&I projects on timber-framed hall roofs, and renovated roofs where the thickness of the insulation has increased. It can also be used on metal roofing when fastening to a timber substructure.

How does it work?

After pre-drilling the screw holes, drive the screws directly into the rafters—an EPDM gasket ensures watertightness where the screw passes through the roofing material. The adapter is placed on the upper, smooth section of the screw, through which the mounting rail is mechanically connected to the fastening point using a sliding nut mechanism.

This design allows you to fine-tune the rail’s position along the screw’s axis after installation, which significantly simplifies the process of straightening the rows. The load is ultimately distributed throughout the roof structure via the rafters.

Technical and System-Level Benefits

The screw and adapter are compatible with the entire Enerack rail system (3.5-meter and 4.2-meter mounting rails, as well as intermediate and end clamps), so the entire mounting chain remains within a single manufacturer’s system—this simplifies structural calculations and warranty claims.

They are made of stainless steel, which not only ensures a long service life but also reduces the risk of galvanic corrosion when in contact with aluminum rails. The higher pull-out strength of the 300 mm version is particularly beneficial in regions with higher snow or wind loads, where structural calculations require greater holding force per fastening point.

Differences

The product range includes both the 10×200 mm and 10×300 mm versions; the main difference between the two is their length:

• 10×200 mm: suitable for standard shingle roofs with normal insulation thickness.
• 10×300 mm: for thicker roof structures, areas with heavier snow and wind loads, or if the structural design requires deeper penetration.

The bottom line: always choose the length based on the roof structure and dimensions, not automatically.

Important to know

This fastening method is only suitable for wooden rafter roof structures—for concrete or metal substructures, you must choose a different solution (e.g., cork hooks for metal roofing, roof hooks for tile roofing). Failure to use proper sealing and to pre-drill holes can lead to leaks, so the installation instructions must be strictly followed.

The screw’s load-bearing capacity must always be verified by Enerack’s structural report or a local structural engineer—the customer bears ultimate responsibility for the roof’s load-bearing capacity.

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From an installer’s perspective, this is one of the easiest and quickest mounting points to work with on shingle roofs—especially if the installation team is already familiar with the Enerack system. It’s a good idea to add the 300 mm version to your cart right away if you’re working on a roof with thicker insulation or if the project is in a high-altitude or windy region.

Be sure to order the appropriate adapter and sliding nut, as well as the compatible mounting rail—without these, the screw alone does not form a complete mounting point. Installation partners should generally keep both the 200- and 300-mm versions in stock so they can be prepared for any roof structure.