Product Picture
Application Picture
Application Picture
1   1

ZYKON undercut anchor FZA

The fixing system with the highest safety in cracked concrete

The fischer ZYKON undercut anchor FZA is an anchor made from zinc-plated steel, stainless steel and highly corrosion-resistant steel. The undercut anchor is ideal for anchoring façades, railings and steel constructions in cracked concrete, both inside and outside. The undercut drill hole is created in a single work step with the special drill bit FZUB. The undercut anchor is set in a pre-positioned and push-through installation. With the setting tool FZE Plus, the expansion sleeve is pressed over the cone and fills the undercut drill hole in a positive-locking manner. This ensures top safety even for large crack widths. The European Technical Approval and classification into fire resistance class R 120 ensure added safety.

Product Description

  • The special ZYKON undercut technology allows for a positive fit connection and ensures maximum safety, even in large cracks.
  • The almost expansion-free installation of the anchor allows small edge distances and axial spacing, and thereby enables flexible use.
  • The FZUB special drill allows for a fast installation by creating the undercut without having to change tools.
  • The drill hole geometry allows for a very low setting energy, thus reducing the energy required for installation.

Available Product Variants


Application and Permission

  • Steelwork constructions
  • Guard rails
  • Consoles
  • Ladders
  • Cable trays
  • Machines
  • Staircases
  • Gates
  • Façades
Building materials
Approved for:
  • Concrete C20/25 to C50/60, cracked and non-cracked
Also suitable for:
  • Concrete C12/15
  • Natural stone with dense structure
You can find detailed information on building materials in the registration document.


  • ETA-98/0004
  • DoP No. 0035
  • DoP No. 0083
  • DoP No. 0083
  • DoP No. 0756-CPD-0290
For Details see corresponding Documents

Assembly Instruction

  • The FZA is suitable for pre-positioned installation.
  • The undercut drill hole is created using the special FZUB drill.
  • Once the anchor has been placed in the drill hole, the expansion sleeve is driven over the cone using the FZE Plus setting tool, and the undercut drill hole is filled with a positive fit.
Mounting Picture
Mounting Picture
Mounting Picture
Mounting Picture
Mounting Picture
Show assembly instruction as PDF

Documents for Downloading


Title Type Created Valid Till
ETA - European Technical Assessment (PDF, 9 MB) European Technical Assessment for fischer-Zykon-Anchor FZA, FZA-D, FZA-I, FZA ST ETA-98/0004 18/02/2020
DOP - Declaration of Performance (PDF, 5 MB) DoP No. 0035 14/01/2016
DOP - Declaration of Performance (PDF, 5 MB) DoP No. 0083 16/09/2016
DOP - Declaration of Performance (PDF, 5 MB) DoP No. 0083 16/09/2016
DOP - Declaration of Performance (PDF, 1 MB) DoP No. 0756-CPD-0290 02/07/2013
Factory Mutual (PDF, 128 KB)

System Components & Related Categories