Fischer DuoHM 4x55 S PH TX ontelotulppa 55 mm 4 kpl 572914

Hollow wall anchor with metric thread screw for secure fastening in cavity walls. The Fischer DuoHM 4x55 S PH TX combines a galvanized steel anchor with a pre-assembled M4 pan head screw, offering reliable load-bearing capacity in plasterboard, gypsum fibreboards, and light building boards. Its dual drive (Phillips PH2 and Torx TX20) ensures flexible installation, while the anti-rotation lugs prevent spinning during tightening.

Advantages

The DuoHM anchor features a short expansion zone that requires minimal cavity depth, making it ideal for thin wall constructions. The integrated lugs bite into the board to resist torque, and the metric thread allows the screw to be removed and reinserted multiple times without damaging the anchor. The combination drive head accommodates both Phillips and Torx bits for convenience.

Suitable for

• Plasterboard walls and ceilings
• Gypsum fibreboards
• Chipboard and light building boards
• Pre-positioned and push-through installation methods

Key specifications

• Anchor diameter: 4 mm
• Anchor length: 55 mm
• Drill hole diameter: 8 mm
• Minimum cavity depth: 55 mm
• Material thickness range: 3 - 13 mm
• Screw: M4 x 60 mm, pan head, Phillips PH2 & Torx TX20
• Material: Galvanized steel
• Pack quantity: 4 pieces

Recommendations

For optimal performance, drill an 8 mm hole and ensure the cavity depth is at least 55 mm. Use a PH2 or TX20 bit to drive the screw until the fixture is secure. Maximum recommended loads on 12.5 mm plasterboard: 0.1 kN tensile, 0.2 kN shear.