Integrated Partner

Design with Würth ASSY Structural Screws

Würth manufactures the ASSY® structural wood screw series for mass timber, integrated into SPEC Toolbox with ETA-11/0190-certified data on every screw. Size, verify and specify a Würth connection into the real CLT, glulam or LVL your project uses, verified to Eurocode 5 and AS 1720.1 in Europe and Australia. Every value comes from Würth's published ETA, not a generic catalogue number.

Start Designing for Free → Powered by SPEC Toolbox. Real ETA-11/0190-certified data on every part.
  • 15 calcs
    CLT tools available
  • 6,000 +
    Engineers using SPEC
  • 12 +
    EU CLT & fastener brands
  • 100 % free
    Browser-based · no download
Integrated product system available now in Australia and Europe.

The Würth system, ready to design

Integrated product system available now in Australia and Europe.

Europe
Screw connection design icon
Screws

Screws

Eurocode 5 (EN 1995-1-1) Calculator →
In their words

Why Würth builds on SPEC

“Our presence on the SPEC Toolbox platform fits so well with our brand, because SPEC Toolbox also focuses on providing users with the best possible solutions for timber construction planning and design. Our presence on the platform is further evidence that we are committed to the intensive development of this sustainable, forward looking construction method, and that we are shaping it as a reliable partnership.”

Daniel Kasper, Head of International Division Construction, Würth

Spectoolbox

About Würth

Würth is leading in the development, production, and sale of fastening and assembly materials, with a long-standing reputation for quality, innovation, and technical excellence. Founded in 1945 and headquartered in Germany, the Würth Group operates in 80 countries.

Würth’s ASSY® series of structural wood screws is engineered for high-performance timber construction, including solid wood, CLT, GLT, and LVL applications, featuring an asymmetric thread design for optimal withdrawal resistance and reduced splitting, plus corrosion-resistant stainless steel (A2/A4) variants.

Frequently asked questions

Design With Würth

Is the Würth calculator free to use?
Yes. Every Würth calculator on SPEC Toolbox runs free in the browser. No download, no licence, no account needed to design and verify a connection.
What standard are Würth screws designed to?
Würth screws are verified to Eurocode 5 and AS 1720.1 under European Technical Assessment ETA-11/0190, applied consistently across Europe and Australia.
Which Würth products are integrated?
Screws (ASSY series, 30+ families) are integrated for Australia and Europe. 1 product system in total. Switch region to see the set for other markets.
Can I design Würth connections in CLT, glulam or LVL from any supplier?
Yes. The calculator lets you select the CLT, glulam or LVL you're specifying from any integrated supplier and verifies the connection against that material's real characteristic density.
Where does the capacity data come from?
Directly from Würth's published ETA-11/0190. Nothing is averaged or re-derived.
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