fischer DuoHM 4x55 S PH PZ ontelotulppa 55 mm, 25 kpl 572920

The fischer DuoHM 4x55 S PH PZ hollow wall anchor sets itself apart with its unique spreading wing mechanism that delivers reliable grip in cavity walls without the need for special tools. Unlike ordinary plastic plugs, this galvanized steel anchor combines a pan head screw with an integrated collar and anti-rotation lugs to prevent spinning during installation, ensuring a secure and professional result every time.

Highlights

• Galvanized steel construction for excellent corrosion protection
• Combination Phillips/PoziDriv drive for versatile screwdriver compatibility
• Anti-rotation lugs prevent the anchor from turning in the drill hole
• Suitable for plasterboard, gypsum fibreboards, chipboard, and light building boards
• Pre-positioned installation allows the fixture to be mounted before tightening
• Pack of 25 anchors with matching pan head screws

In daily use

Installing shelves, cabinets, or light fixtures on hollow walls becomes straightforward with the DuoHM. Drill an 8 mm hole, insert the anchor, and drive the screw—the wings expand behind the panel to distribute load evenly. The collar prevents the anchor from pulling through, while the anti-rotation lugs keep it stable during tightening. The PH/PZ drive accommodates both Phillips and PoziDriv bits, reducing the chance of cam-out.

Full specifications

• Anchor type: Hollow wall anchor
• Anchor series: fischer DuoHM
• Material: Galvanized steel
• Anchor length: 55 mm
• Screw diameter: 4 mm
• Drill hole diameter: 8 mm
• Minimum cavity depth: 55 mm
• Maximum fixture thickness: 13 mm (depending on panel)
• Drive type: Phillips (PH) / PoziDriv (PZ) combination
• Pack quantity: 25 pieces
• Installation type: Pre-positioned installation
• Recommended base materials: Plasterboard, gypsum fibreboards, chipboard, light building boards
• Corrosion protection: Zinc-plated
• Expansion principle: Spreading wings behind panel
• Screw type included: Pan head screw
• Collar type: With collar
• Special features: Anti-rotation lugs, easy installation

Final note

For reliable hollow wall fixings that hold firm under load, the fischer DuoHM 4x55 S offers a professional-grade solution in a convenient 25-piece pack.