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Metal cavity fixing HM

The versatile metal cavity fixing with metric screws

The fischer metal cavity fixing HM is a flexible cavity fixing with metric screw for all panel building materials with a wall thickness of 3 to 50 mm. The plug is set in the pre-positioned installation using the installation pliers fischer HM-Z 1. The plug is pulled against the panel building materials using the pliers. The expanding arms swing open and press onto the reverse side of the board. Alternatively, installation is also possible with a screwdriver or cordless screwdriver. The fixture can be fixed and released multiple times thanks to the metric internal thread. The fischer metal cavity fixing HM is suitable for fixing lighting, pictures and light shelves indoors.

Product Description


  • Due to the extensive range, the HM is suitable for board building materials with a thickness of 3-50 mm and thus suitable for a number of different applications.

  • The metric internal thread allows the attachment to be removed and refitted several times, thus offering the best possible flexibility.

  • The HM's expanding arms ensure a large supporting surface, thus allowing a high load-bearing capacity.

  • The claws around the edge of the fixing penetrate the board building material, preventing the fixing from rotating, thus ensuring a secure installation.

Available Product Variants

Application and Permission

  • Pictures
  • Lighting
  • Light shelves
  • Towel rails
  • Mirror cabinets
  • Curtain rails
  • Sub-structures
Building materials
  • Gypsum plasterboard and gypsum fibreboards
  • Cavity floor slabs
  • Light building boards made of wood wool
  • Chipboard
  • Plywood boards
You can find detailed information on building materials in the registration document.

Assembly Instruction


  • The metal cavity fixing HM is suitable for pre-positioned installation.

  • The fixing should be selected based on the thickness of the board building material, to allow the very best expansion in the cavity.

  • During installation, the expanding arms swing open and press onto the reverse side of the board.

  • The HM can be installed using installation pliers. If using a battery operated screwdriver or screwdriver for installation, the pre-assembled screws must be removed first. When screwing in and expanding the fixing, the attachment, or a max. 6 mm plate, needs to be used as a turning stop.

System Components & Related Categories