Integrated Partner

Design with Bi-Mirth Structural Screws

Bi-Mirth manufactures self-drilling and self-tapping timber construction screws, integrated into SPEC Toolbox with ETA-certified data on every screw. Size, verify and specify a Bi-Mirth connection into the real CLT, glulam or steel your project uses, verified to Eurocode 5 (EN 1995-1-1) in Europe. Every value comes from Bi-Mirth's published ETA-12/0471 assessment, not a generic catalogue number. Bi-Mirth has manufactured self-drilling and self-tapping screws since 1989, offering diameters from M5 to M20 and lengths up to 1,500mm.

Explore The Integrations → Powered by SPEC Toolbox. Real ETA-12/0471-certified data on every part.
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Integrated product system available now in Europe

The Bi-Mirth system, ready to design

Integrated product system available now in Europe, designed to Eurocode 5.

Europe
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Screws

Screws

Eurocode 5 (EN 1995-1-1, §8.7.2), editions 2004 and 2025 Calculator →
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About Bi-Mirth

Bi-Mirth Corporation is a Taiwan-based fastener manufacturer with roots dating back to 1986, when the company began as Bi-Mirth Trading Co. in Taipei. After relocating to Gangshan in 1989, the business transitioned from trading into manufacturing self-drilling and self-tapping screws. Today, Bi-Mirth offers self-drilling, self-tapping, timber construction, and concrete screws in diameters from M5 to M20 and lengths up to 1,500 mm, with OEM/ODM capability supported by in-house production, coating, electroplating, and packaging services.

For timber construction, Bi-Mirth highlights Timber Screw, Timber Fast+, BM Quick Drill, and Construction Lag Screw lines, manufactured in line with CE, ISO, and ETA requirements — timber screws certified to CE EN 14592:2008, with several BM Quick Drill variants certified and controlled by a European notified body. Bi-Mirth states it holds ETA-12/0471.

Frequently asked questions

Design With Bi-Mirth

Is the Bi-Mirth calculator free to use?
Yes. Every Bi-Mirth calculator on SPEC Toolbox runs free in the browser. No download, no license, no account needed to design and verify a connection.
What standard are Bi-Mirth screws designed to?
Bi-Mirth screws are verified to current & next generation EN 1995-1-1 (Eurocode 5) together with the product's ETA-12/0471 assessment; timber screws are also certified to CE EN 14592:2008.
Which Bi-Mirth products are integrated?
Screws are integrated for Europe. 1 product system in total.
Can I design Bi-Mirth 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 Bi-Mirth's published ETA-12/0471 assessment. Nothing is averaged or re-derived.
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