Screw kit Fischer 437331

The Fischer Thermax 10 stand-off insulation fixing is designed for attaching light fixtures to external walls without creating a thermal bridge in ETICS (external thermal insulation composite systems). The stud screw features a glass-fibre‑reinforced cone that cuts through the plaster and insulation, and the anti‑cold cone at the tip provides a thermal break while retaining the outer fixing. The system is used together with the universal UX plug for secure anchoring in concrete, aerated concrete and masonry, and can fix items such as lights, letterboxes or lightning conductors. The Fischer 437331 screw kit includes two M10 screws suitable for timber substrates and is supplied in a bag for convenient storage and transport.

Advantages

The stand-off design allows the fixture to be set to the exact required position, avoiding pressure marks and damage to the ETICS. The plastic cone creates a thermal barrier between the external and internal parts of the fixing, providing energy‑optimised attachment. The glass‑fibre‑reinforced cone forms its own positive fit through the ETICS for simple, fast installation without special tools. Used with the UX universal plug, the Thermax 10 achieves secure anchoring in the base material. For wooden substrates, the M10 screws included in the Fischer 437331 kit permit direct mounting after pre‑drilling.

Suitable for

• Fixing light fittings (e.g., exterior lamps) to ETICS‑covered walls
• Securing letterboxes and small exterior installations
• Mounting lightning conductors and similar light loads
• Anchoring into concrete, aerated concrete and masonry (with UX plug)
• Direct mounting into wood substrates using the supplied M10 screws (after pre‑drilling)

Key specifications

• Product: Thermax 10 stand‑off insulation fixing (stud screw with glass‑fibre‑reinforced cone)
• Compatible plug: UX universal plug for secure anchoring in masonry and concrete
• Typical use: Light loads—lights, letterboxes, lightning conductors
• Screw kit: Fischer 437331 includes 2 × M10 screws for wood substrates
• Packaging: screw kit supplied in a bag

How to use

Drill the required hole through the external render and insulation to the substrate. Rotate the Thermax stud screw into the UX universal plug until the glass‑fibre‑reinforced cone cuts through the insulation and the anti‑cold cone seats against the external fixing. When using the Fischer 437331 M10 screws for wood substrates, pre‑drill a pilot hole and drive the M10 screw into the timber to secure the fixture. Ensure the fixture is adjusted to the correct stand‑off distance to avoid pressure marks on the ETICS.

Recommendations

Use the Thermax 10 with the UX universal plug for reliable anchoring in concrete, aerated concrete and masonry. For timber substrates, use the supplied M10 screws (Fischer 437331) after pre‑drilling. Do not overtighten to prevent damage to the insulation layer; follow local building regulations and manufacturer installation guidelines.