Integrated Partner

Design with Simpson Strong-Tie Connectors & Screws

Simpson Strong-Tie manufactures structural connectors, fasteners and anchors for mass timber, integrated into SPEC Toolbox with code-compliant testing data on every part. Size, verify and specify a Simpson Strong-Tie connection into the real CLT, glulam or steel your project uses, verified to ETA-13/0796 (screws) and ETA-06/0106 / ETA-07/0285 (brackets) in Australia and New Zealand, and under several ICC-ES evaluation reports in the US. Every value comes from Simpson Strong-Tie's own physical testing data, not a generic catalogue number.

Explore The Integrations → Powered by SPEC Toolbox. Real code-compliant testing 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 systems available now in Australia, New Zealand and the USA.

Every Simpson Strong-Tie system, ready to design

Integrated product systems available now in Australia, New Zealand and the USA.

Australia
Bracket connection design icon
Brackets

Brackets

Eurocode 5 (EN 1995-1-1) Calculator →
USA
Hanger connection design icon
Hangers

Hangers

the NDS (ANSI/AWC NDS) under the IBC / IRC Calculator →
Australia
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 Simpson Strong-Tie builds on SPEC

“Together, we are combining the world class testing and code compliance of Simpson Strong-Tie products with the intelligence and accessibility of SPEC Toolbox software, creating a seamless experience that helps engineers integrate our products directly into their mass timber designs.”

— Chris Crawford, Director, OEM and Mass Timber Market Segments, Simpson Strong-Tie

Spectoolbox

About Simpson Strong-Tie

Simpson Strong-Tie, a global leader in structural connection systems, offers a comprehensive portfolio of engineered solutions for mass timber construction. With over 65 years of innovation in fastening and anchoring technologies, the company is trusted worldwide for high-performance connectors, fasteners, and seismic solutions.

Simpson Strong-Tie’s structural screws, anchors, and connectors are engineered for high-load applications and streamlined installation, backed by extensive code-compliant testing, in-house engineering support, and design resources.

Frequently asked questions

Design With Simpson Strong-Tie

Is the Simpson Strong-Tie calculator free to use?
Yes. The Simpson Strong-Tie calculators on SPEC Toolbox runs free in the browser. No download, no license, no account needed to design and verify a connection.
What standard are Simpson Strong-Tie connectors and fasteners designed to?
In Australia and New Zealand, Simpson Strong-Tie screws are verified under ETA-13/0796 and brackets under ETA-06/0106 and ETA-07/0285. In the US, the same product families are evaluated across several ICC-ES reports (including ER-192, ER-262, ESR-3046, ESR-1472 and ESR-2236, each covering specific screw families).
Which Simpson Strong-Tie products are integrated?
Screws (11 families) and Brackets are integrated for Australia, New Zealand and the USA. 2 product systems in total. Switch region to see the set for other markets.
Can I design Simpson Strong-Tie 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 Simpson Strong-Tie's own physical testing and code compliance data --- ETA-13/0796, ETA-06/0106 and ETA-07/0285 in ANZ; ICC-ES evaluation reports in the USA. Nothing is averaged or re-derived.
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