Fischer 512173 Screw and Wall Plug Set

The fischer stand-off insulation system TherMax 10 is designed for fixing fixtures into external walls with ETICS while avoiding thermal bridges. The stud screw with a glass-fibre reinforced cone penetrates the render and insulation and is rotated into the universal UX plug during installation to secure the fixing in the base material. An anti-cold cone at the tip of the stud screw forms a thermal barrier and retains the outer fixing. TherMax 10 is suitable for fastening light loads such as lights, letterboxes, or lightning conductors into concrete, aerated concrete, and masonry from solid and perforated brick.

Advantages

The stand-off installation permits exact positioning of the fixture and prevents pressure marks or damage to the ETICS. The plastic anti-cold cone provides a thermal break between the outer and inner fixing for an energy-optimised solution. The glass-fibre-reinforced plastic cone cuts through the ETICS with positive engagement, enabling simple, fast installation without special tools. Used together with the universal UX plug, TherMax 10 achieves secure anchoring in the substrate. Where the UX plug is not used, direct mounting into timber substrate is possible after pre-drilling.

Suitable for

• Fixing lights and luminaires to ETICS on concrete, aerated concrete, or masonry
• Mounting letterboxes and small fixtures to external walls with insulation
• Attaching lightning conductors and other light accessories to brick and blockwork

Key specifications

• Kit contents: wall plugs and screws (2 pieces)
• Plug length: 70 mm
• Plug/drill hole diameter: 12 mm (1.2 cm)
• Suitable substrates: concrete, autoclaved aerated concrete (AAC), solid and perforated masonry
• Brand: FISCHER, MPN: 512173, EAN: 4048962114775

How to use

Drill a hole of the specified diameter through the ETICS and insulation into the base material. Insert the universal UX plug (if used) and position the fixture at the required stand-off distance. Rotate the TherMax stud screw into the UX plug until the cone seats and secures the fixing; the glass-fibre reinforced cone will cut through the insulation for a positive fit. Tighten the screw to secure the fixture while avoiding over-torquing that could damage the ETICS. For direct timber mounting without UX, pre-drill a matching pilot hole and drive the stud screw in.

Recommendations

Use TherMax 10 together with the universal UX plug for reliable anchoring in masonry and concrete. Always observe the insulation system manufacturer’s instructions and relevant building standards when fixing to ETICS. Check load requirements and substrate condition; restrict use to light loads as specified (lights, letterboxes, lightning conductors). Pre-drill timber and verify drill diameter and embedment depth before installation.