How a Simple Idea Revolutionized Support Systems
If you've ever installed piping, conduit, HVAC, or electrical systems, chances are you’ve worked with strut channel. This unassuming metal framing system—also called Unistrut, channel framing, or metal framing channel—has become a cornerstone of modern construction and industrial infrastructure.
But where did it come from? Who invented it? And why has it stood the test of time?
Let’s explore the origin, evolution, and enduring value of strut channel.
What Is Strut Channel?
Strut channel is a U-shaped metal framing system made from steel, stainless steel, or aluminum, used to support, mount, brace, or connect structural loads. Commonly found in mechanical, electrical, and plumbing (MEP) systems, it's compatible with a wide range of fittings, clamps, and hardware, allowing for fully customizable, bolt-together frames without welding.
Standard dimensions include:
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1-5/8" width (most common)
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Half-slot, full-slot, or solid backs
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Single or double channel configurations
- Also available in side by side, side by back, Triple, and Quad configurations
The Invention: Enter Charles Attwood and Unistrut®
The story of strut channel begins in 1924, when Charles Attwood, a Detroit-based engineer and inventor, created a modular framing system designed to simplify the way engineers supported piping and electrical conduit.
He founded the Unistrut Corporation, which launched the original strut channel system. It was revolutionary: a slotted steel channel that allowed brackets and hardware to be inserted and repositioned without the need for welding, drilling, or custom fabrication.
This was a game-changer for contractors and engineers.
“Why weld when you can bolt it together?”
Unistrut quickly became the standard for mechanical supports, seismic bracing, overhead infrastructure, and even lightweight structural systems.
Evolution of the Channel
After the initial Unistrut design, the concept caught on across industries. Over the decades, many manufacturers developed their own compatible systems, including:
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Superstrut
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B-Line
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Wesanco
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Power-Strut
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Empire and others
While Unistrut became a brand name, “strut channel” became the generic term for this modular framing system.
Advancements included:
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Corrosion-resistant finishes (pre-galvanized, hot-dip galvanized, epoxy coated, stainless)
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Accessory development: spring nuts, pipe clamps, seismic kits
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International standardization (ASTM, UL, and NFPA compatibility)
Why Strut Channel Changed Everything
Before strut, supporting conduit or piping often required custom welding, drilling steel beams, or relying on bulky brackets. These were expensive, time-consuming, and difficult to adjust in the field.
Strut channel offered:
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Ease of installation
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Adjustability without special tools
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Universal hardware compatibility
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Durability in harsh environments
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Reduced labor costs
Its impact is seen in virtually every commercial or industrial building today—from data centers and power plants to hospitals, schools, and stadiums.
Today’s Use & Legacy
Strut channel remains an essential element in:
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Electrical raceways
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HVAC and plumbing supports
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Solar racking systems
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Seismic bracing and anchoring
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Equipment framing and mounting
While many variations and accessories have emerged, the core design of Charles Attwood's invention remains fundamentally unchanged—a testament to its brilliance.
Final Thoughts
The humble strut channel might not grab headlines, but its impact on modern construction and infrastructure is undeniable. What started as a simple slotted U-channel in 1924 became a global standard for efficient, modular framing systems.
Next time you're working with strut, take a moment to appreciate this nearly century-old innovation that continues to hold everything together—literally.
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