The ULAMEX Double Adjustable Hook Handle on the Angle is a dual-axis adjustable stainless steel roof hook designed for photovoltaic installations on complex and multi-pitched roof structures. Manufactured from H17 stainless steel (1.4016 / AISI 430), this ferritic stainless hook offers two independent adjustment axes — height and angle — enabling precise rail alignment even on roofs with irregular rafter spacing, varying pitches or structural obstacles. The hook is 30 mm wide, available in 120 or 150 mm lengths with 4 or 5 mm thickness options, and is fastened with a Torx wood screw into the rafter substructure.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | H17 stainless steel (1.4016 / AISI 430), ferritic |
| Height | Adjustable (dual-axis: height + angle) |
| Width | 30 mm |
| Length options | 120 / 150 mm |
| Thickness options | 4 / 5 mm |
| Fastening | Torx wood screw (into rafter) |
| Finish | Natural stainless (mill finish) |
| Roof type | Complex geometries: hip, dormer, multi-pitch |
| Service life | 25+ years |
Installation Guide
Lift the roof tile or covering at the planned hook position to expose the rafter or structural timber beneath. Mount the angle bracket to the rafter using the Torx wood screw — pre-drill a pilot hole if the timber species requires it. The first axis (angle) is set by adjusting the bracket’s position relative to the rafter surface, compensating for the roof pitch and any local irregularities. The second axis (height) is adjusted independently to bring the hook head to the required level for the PV mounting rail. Once both axes are set, tighten all fastening bolts to lock the hook in position. Replace the roof tile over the hook body. The compact 120 or 150 mm length keeps the hook footprint small, minimising interference with surrounding tiles. Attach the mounting rail and proceed to the next hook position. The dual adjustment capability means fewer compromises on hook placement — hooks can be positioned where structural support is strongest, not just where a fixed hook would align with the rail.
Roof Compatibility
The double adjustable hook is the solution of choice for complex roof geometries where single-axis hooks cannot achieve proper alignment. Typical applications include hip roofs, dormer roofs, mansard roofs, multi-pitched roofs and renovated buildings with uneven rafter geometry. The angle adjustment compensates for pitch transitions and structural irregularities, while the height adjustment handles rafter depth variations. Available in 120 mm length for standard applications and 150 mm for deeper tile profiles or greater adjustment range. The 5 mm thickness option provides additional rigidity for heavy-duty applications or larger PV module formats. This hook works with most tile types — interlocking, plain and profiled — wherever dual-axis adjustment is needed to overcome geometric constraints.
Material Properties — H17 Stainless Steel
H17 (1.4016 / AISI 430) is a ferritic chromium stainless steel containing 16–18% chromium, delivering good atmospheric corrosion resistance with a tensile strength of approximately 450 MPa. The double adjustable hook uses H17 in both 4 mm and 5 mm thicknesses — the thicker option provides additional bending resistance for applications where the hook bears higher loads or spans a longer unsupported length. H17 is chosen over austenitic grades for concealed roof hook applications because it offers sufficient corrosion protection at lower cost, with superior resistance to stress corrosion cracking from thermal cycling. The magnetic properties of ferritic stainless steel aid handling during installation.
Why Choose ULAMEX
ULAMEX has supplied structural steel and stainless steel components for over 35 years, holding EN 1090 certification for the execution of steel and aluminum structures. As a B2B wholesaler, we deliver roof hooks, PV profiles, clamps, fasteners and ballast systems from a single source — reducing procurement complexity and ensuring component compatibility. European delivery with competitive wholesale conditions for solar installers, distributors and EPC contractors.
Frequently Asked Questions
When should I use a double adjustable hook instead of a standard S-hook?
Use the double adjustable hook when the roof geometry prevents standard single-axis hooks from achieving a level mounting rail. This includes hip roof transitions, dormer areas, roofs with mixed pitches and buildings where rafters run at varying angles. If a standard S-hook or plain tile hook can achieve proper alignment on your roof, use those — they are simpler and more cost-effective for straightforward installations.
Should I choose the 4 mm or 5 mm thickness?
The 4 mm version is suitable for standard residential PV installations with modules up to approximately 25 kg. Choose the 5 mm version for larger/heavier modules, higher wind zones, or installations where the hook must bridge a longer unsupported span between the rafter and the mounting rail. A structural engineer should specify the required thickness based on the site-specific load calculation.
Can this hook be used on flat roofs?
No. The double adjustable hook is designed for pitched roofs with tile or slate coverings. For flat roof installations, ULAMEX supplies ballast tray systems and PV tilt triangles that provide non-penetrating mounting solutions without roof hooks.