Integrated Partner

Design with Sihga Mass-x Connectors

Sihga manufactures the Mass-x structural connector series for mass timber, integrated into SPEC Toolbox with manufacturer-verified data on every bracket. Size, verify and specify a Sihga connection into the real CLT, glulam or steel your project uses, verified to Eurocode 5 in Europe and AS 1720.1 in Australia. Every value comes from Sihga's published technical data, not a generic catalogue number.

Explore The Integrations → Powered by SPEC Toolbox. Real manufacturer-verified 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 Sihga system, ready to design

Integrated product system available now in Australia and Europe.

Europe
Rothoblaas Mass-X Angle bracket, side view
Brackets

Brackets

Eurocode 5 (EN 1995-1-1) Calculator →
Europe
Pitzl GoFix MS II 50 connector
Screws

Screws

Eurocode 5 (EN 1995-1-1, §8.7 and §8.7.2), editions 2004 and 2025 Calculator →
In their words

Why SIHGA builds on SPEC

“This is also the reason why we decided to cooperate with SPEC Toolbox: it is important that timber constructors have fast, easy to use software tools at their disposal to make rapid progress with their projects, and these must be of high security and quality. SPEC Toolbox offers these criteria, in line with what is also at the top of SIHGA’s list.”

— Hans Gruber, Chief Product Officer, Sihga

Spectoolbox

About SIHGA

Sihga, an Austrian company, specializes in innovative fastening systems for timber construction. With a focus on quality and user-friendliness, Sihga’s products are designed to facilitate efficient and secure construction processes, including solutions for wood connectors, decking, and various timber construction applications.

Sihga is known for its commitment to innovation and sustainability, continually developing new products that meet the evolving needs of the timber construction industry.

Frequently asked questions

Design With SIHGA

Is the Sihga calculator free to use?
Yes. Every Sihga 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 Sihga brackets designed to?
In Europe, Sihga brackets are verified to Eurocode 5 under ETA-23/0353. In Australia the same products are checked to AS 1720.1.
Which Sihga products are integrated?
Brackets (Mass-x series) are integrated for Australia and Europe. 1 product system in total. Switch region to see the set for other markets.
Can I design Sihga 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 Sihga's published ETA-23/0353 technical data. Nothing is averaged or re-derived.
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