Wall plug FISCHER DuoHM 5 x 55 S PH PZ – 5 mm diameter, 55 mm length, Pozidriv screws (set of 4)

The Fischer DuoHM 5 x 55 S PH PZ is a cavity wall plug designed to cover common panel material thicknesses from 9.5 to 30 mm with a single plug length. It combines a nylon body and a metal sleeve so the sleeve folds behind the panel while the nylon base knots into the material, providing reliable anchorage for fittings. The plug is supplied in a set with matching M5 x 55 screws and is suitable for repeated screwing thanks to its metric internal thread.

Advantages

The DuoHM can be installed quickly and easily with a cordless screwdriver without additional setting tools, reducing installation time by up to 50% compared with conventional panel plugs. Its two-component construction (metal sleeve and nylon body) meets higher load requirements: the metal sleeve presses against the rear of the panel while the nylon element knots in the building material. One plug length covers a wide range of panel thicknesses (9.5–30 mm), increasing flexibility and reducing inventory needs. The metric internal thread allows screws to be removed and reinserted multiple times, and the nylon anti-rotation lock protects the panel surface during installation. The narrow plug edge makes the fixing invisible behind the attachment.

Suitable for

• Fixing furniture, shelves and cabinets to panel and hollow building materials
• Mounting radiators, towel rails and sanitary fittings on panel walls
• Securing light to medium load attachments in hollow or panel substrates
• Installations where fast, repeatable anchoring is required

When it may not be suitable

The DuoHM is designed for panel and hollow building materials within the 9.5–30 mm thickness range; it is not suitable for solid masonry or very thin panels outside this range. For very heavy loads in solid substrates, use anchors specifically rated for solid masonry or concrete.

Key specifications

• Diameter: 5 mm
• Overall length: 55 mm
• Covers panel thicknesses: 9.5–30 mm
• Material: nylon body with metal sleeve (two-component technology)
• Thread type: internal metric thread, compatible with M5 screws
• Included in set: 4 plugs + 4 screws M5 x 55

How to use

Drill the recommended hole diameter for the 5 mm DuoHM into the panel material, insert the plug until the narrow edge sits flush with the surface, then drive the supplied M5 x 55 screw (or another compatible M5 screw) with a Pozidriv/PZ or Phillips PH driver using a cordless screwdriver. The metal sleeve will fold and press against the rear of the panel while the nylon body expands to form a knot in the material. Screws can be removed and reinserted as required thanks to the internal metric thread.

What to consider before purchase

• Ensure panel thickness is within 9.5–30 mm
• Confirm the required drill diameter matches the plug (recommended for 5 mm plug)
• Verify load requirements—use anchors designed for solid masonry for very heavy loads
• Check screw head type (Pozidriv/PH) and length compatibility with the attachment

Usage recommendations

Use a cordless screwdriver for fastest installation and avoid excessive torque when driving the screw to prevent damage to the panel. For critical or load-bearing applications, follow relevant installation guidelines and consult technical data from the manufacturer.