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ZYKON undercut anchor FZA-I

The anchoring system with internal thread for top safety in cracked concrete

The fischer ZYKON internal threaded anchor FZA-I is made from zinc-plated and stainless steel. The metric internal thread allows for the use of conventional screws or threaded rods. The plug construction also enables surface-flush removal. 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 installation. With the setting tool FZE Plus, the expansion sleeve is pushed 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 metric internal thread means that it is possible to use standard screws or threaded rods for the ideal adaptation to suit the intended use.
  • The FZA-I allows for surface flush removal and reuse of the fixing point, and therefore offers the best possible flexibility.
  • Furthermore, the ZYKON undercut anchor FZA-I offers all the benefits of the FZA.

Available Product Variants


Application and Permission

  • Steel constructions
  • Guard rails
  • Consoles
  • Ladders
  • Cable trays
  • Machines
  • Staircases
  • Gates
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

  • FZA-I with internal thread 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.
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Show assembly instruction as PDF

Documents for Downloading


Title Type Created Valid Till
(PDF, 9 MB) 18/02/2020
ETA - European Technical Assessment (PDF, 9 MB) European Technical Assessment for fischer-Zykon-Anchor FZA, FZA-D, FZA-I, FZA ST ETA-98/0004 12/09/2016
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)

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