Integrated Partner

Design with Klimas Structural Screws

Klimas manufactures structural timber screws for mass timber, integrated into SPEC Toolbox with manufacturer-verified data on every screw. Size, verify and specify a Klimas connection into the real CLT, glulam or steel your project uses, verified to Eurocode 5 and AS 1720.1 under ETA-18/0817, and to ICC-ES ESR-5302 in the US. Every value comes from Klimas' published technical data, not a generic catalogue number.

Explore The Integrations → Powered by SPEC Toolbox. Real ETA-18/0817 and ICC-ES ESR-5302-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 across ANZ, Europe and the USA.

The Klimas system, ready to design

Integrated product system available now across ANZ, Europe and the USA.

Europe
Screw connection design icon
Screws

Screws

Eurocode 5 (EN 1995-1-1, §8.7.2), editions 2004 and 2025 Calculator →
USA
Screw connection design icon
Screws

Screws

the NDS (ANSI/AWC NDS) under the IBC / IRC Calculator →
In their words

Why Klimas builds on SPEC

“If you ask me why we became a partner of SPEC Toolbox, I will answer simply: because we share common experiences and beliefs. We understand there is still a long way to go for mass timber, and we want to be part of that journey. And this road will lead nowhere without education, so we want to train, to teach, and to show opportunities.”

— Slawomir Iwanicki, Business Development Manager, Klimas

Spectoolbox

About Klimas

Klimas Wkręt-met is a leading European manufacturer of fastening technologies, offering a wide range of high-performance screws and connectors for timber construction. With over 35 years of experience, the company operates multiple modern production facilities in Poland and supplies products to over 65 countries worldwide.

Klimas provides an extensive portfolio of fasteners for structural timber applications, including timber-frame houses, CLT, and glulam construction, with carpentry and construction screws optimized for joining beams, rafters, floor and wall elements.

Frequently asked questions

Design With Klimas

Is the Klimas calculator free to use?
Yes. Every Klimas 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 Klimas screws designed to?
In Europe and ANZ, Klimas screws are verified to Eurocode 5 and AS 1720.1 under ETA-18/0817. In the US, the same products are checked under ICC-ES ESR-5302.
Which Klimas products are integrated?
Screws (18 families) are integrated for ANZ, Europe and the USA. 1 product system in total. Switch region to see the set for other markets.
Can I design Klimas 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 Klimas' published ETA-18/0817 (EU/ANZ) and ICC-ES ESR-5302 (USA) technical data. Nothing is averaged or re-derived.
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