Other mechanical fasteners, connectors and connections in timber construction

Timber fasteners and connectors are used to permanently connect timber elements to other elements.

Regulatory framework

DIBt grants national technical approvals (abZ) for mechanical fasteners and connectors in timber construction

  • when they are not covered by the harmonised standards and
  • when they deviate significantly from the Technical Building Rules (cf. MVV TB, Chapter C 2) or
  • when neither Technical Building Rules nor generally recognised technical rules exist (e.g. innovative products).

European Technical Assessments (ETAs) can also be issued for fasteners and connectors that are not (fully) covered by a harmonised standard.

DIBt grants general construction technique permits (aBG) for connections executed with timber fasteners or connectors when there is no conclusive technical rule for design and execution.

Application forms

National procedure

A national technical approval (abZ) and/or oder general construction technique permit (aBG) is granted upon application (see Model Building Code (MBO), Sections 16a(2) and18(2) and (4)). This also applies to amendments and supplements to, or renewals of existing approvals and/or construction technique permits.

No formal requirements apply. The following information is needed: name and address of the applicant, description of the product and/or construction technique and its field of use or application, type of decision required (new decision, amendment or supplement to, or renewal of, an existing decision).

Please feel free to use the template below.

Application for a national technical approval and/or construction technique permit (3 pages)

Version: January 2018; Application form

Application for amendment / supplementation / renewal of a national technical approval and/or construction technique permit (4 pages)

Version: January 2018; Application form

Guideline: How to provide drawings for national technical approvals and general construction technique permits (5 pages)

Version: July 2017

European Technical Assessment (ETA)

To start the ETA procedure, please submit the form below. We will then check if the prerequisites for issuing an ETA are met, i.e., in particular, if the product is not fully covered by an existing harmonised standard. If the prerequisites are met, we will check whether a European Assessment Document (EAD) covering the requested assessment scope already exists or still needs to be developed. If an EAD needs to be developed or amended, a complete technical file needs to be established before the procedure can begin.

Form for requesting a European Technical Assessment (ETA) (2 pages)

Last updated: 16 June 2022

  • abZ/aBG
  • Z = new decision | E = supplement | Ä = amendment | V = renewal | G = valid until
    Subject concerned Applicant Decision no. Validity
    from / to
    Merk-Gewindeanschluss (MGA) als Hirnholz-Verbindungsmittel (Stützenfußanschluss)

    ZÜBLIN Timber GmbH

    Industriestraße 2

    86551 Aichach

    Z-9.1-264 Z: 18.12.2020
    G: 18.12.2025
    NHT-Verbinder als Holzverbindungsmittel

    ZÜBLIN Timber GmbH

    Industriestraße 2

    86551 Aichach

    Z-9.1-380 Z: 16.10.2020
    G: 16.10.2025
    Verbindungen unter Verwendung von Hoffmann-Schwalben

    Hoffmann GmbH

    Mergelgrube 5

    76646 Bruchsal

    Z-9.1-436 Z: 26.07.2022
    G: 02.08.2027
    Haubold-Jumbo-Wellennägel Typ WN 9,5 / 35, WN 12,5 / 35 und WN 15 / 35 als Holzverbindungsmittel für die Ausführung von schubsteifen Beplankungsstößen und Brettstößen

    ITW Befestigungssysteme GmbH

    Carl-Zeiss-Straße 19

    30966 Hemmingen

    Z-9.1-608 Z: 11.05.2020
    G: 30.04.2025
    Pfosten-Riegel-Verbindung für Holz-Glas-Fassaden

    Seufert-Niklaus GmbH

    Lindenweg 2

    97654 Bastheim

    Z-9.1-658 Z: 17.09.2022
    G: 03.09.2027
    LANG Pfosten-Riegel-Verbindungen für Holz-Glas-Fassaden

    Walter Lang GmbH & Co. KG

    Robert-Bosch-Straße 4

    75031 Eppingen

    Z-9.1-688 Z: 17.12.2018
    G: 27.11.2023
    Schraubdübel ejotherm STR H A2, STR H E, STR H und EJOT HFS zur Befestigung von Wärmedämm-Verbundsystemen auf Außenwänden in Holzbauart

    EJOT Baubefestigungen GmbH

    In der Stockwiese 35

    57334 Bad Laasphe

    Z-9.1-822 Z: 30.06.2020
    G: 21.02.2023
    fischer termoz 6 H Dübel zur Befestigung von Wärmedämm-Verbundsystemen auf Außenwänden in Holzbauart

    fischerwerke GmbH & Co. KG

    Klaus-Fischer-Straße 1

    72178 Waldachtal

    Z-9.1-887 Z: 01.02.2021
    G: 18.06.2024

Anja Dewitt
Head of Section – Timber Construction

Phone +49 30 78730-317
Email adw(at)dibt(.)de

Legal reference documents

Testing, certification, inspection