what is strut channel

What Is a Strut Channel? 7 P1000 Standard Facts

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What Is a Strut Channel? 7 P1000 Standard Facts

A strut channel is a cold formed steel channel with slots down both faces so fittings can slide anywhere along its length. The P1000 section, 41 by 41 mm with 2.5 mm wall, is the industry default across most of the world. A roll forming machine line produces it continuously from coil with in line perforation.
When a buyer asks what is a strut channel, the honest answer covers four things: the profile geometry, the slot pattern, the load table, and the coating. Get those four right and the purchase is straightforward. Get the slot pitch wrong and the fittings will not fit.
Short answer: A strut channel is a U shaped cold formed steel section with slots along both flanges, used to build frames, supports, and equipment mounting. The P1000 standard covers 41×41 mm and 41×62 mm sections with 2.0 to 2.5 mm wall. Slots accept standard fittings, so a frame can be assembled and reconfigured without welding.

Fact 1: It Is a Cold Formed Section, Not an Extrusion

Strut channel forms from steel coil. The coil passes through a series of roll stations that gradually bend flat strip into the channel shape. Wall thickness is set by the incoming coil, not by the rolls.
That answer to what is a strut channel matters commercially. Anyone comparing a roll formed strut channel against a hand formed or welded bracket is comparing two different products, not two suppliers of the same part.
The alternative process is hot rolled channel. Hot rolled sections carry a heavier wall and lower yield strength, which is why they appear in structural applications but rarely in equipment support framing.
The practical difference for buyers: a roll formed strut channel holds tighter dimensional tolerance across the 6 or 12 m length, because the profile is fixed by tooling across the whole run. That matters when slotted faces must stay in register for a frame.
The how a roll forming machine works guide walks through the station sequence in detail.
cable tray run supported on strut channel brackets

Fact 2: P1000 Refers to a Family, Not One Size

P1000 is a European-origin designation that became a global shorthand for a nominal 41 mm channel. Two sections carry the name in normal trade:
SectionHeightWidthWallTypical use
P1000 (41×41)41 mm41 mm2.0 to 2.5 mmLight frames, equipment rails
P1000 (41×62)41 mm62 mm2.0 to 2.5 mmHeavier spans, longer unsupported runs
The 41×62 variant is often called P1000 NA2 or simply the 62 mm channel. Shops that only stock 41×41 substitute it for heavier work, then hit deflection problems on long spans.
European channel dimensional standards sit under EN 10365. North American buyers often reference the P1000 designation alongside proprietary 1-5/8 inch sections used in electrical work. Confirm which standard the tender cites before ordering tooling.
strut channel joint fitting bolted to slotted channel

Fact 3: Slots Run the Full Length, and ThatIs the Point

Both flanges carry a continuous slot, normally 9 by 38 mm on a 50.8 mm pitch. The slot width is deliberately larger than any standard bolt, so a fitting can slide until the bolt catches the edge.
This is what separates strut from ordinary channel. A plain channel has bolt holes at fixed points. A strut channel has unlimited fixing positions, so a frame can be laid out to match the equipment it carries rather than to match a hole pattern.
Slot pitch also sets cost. Closer pitch means more punching cycles per metre and a slower line. The standard 50.8 mm pitch balances fixing density against throughput, which is why it dominates.

Fact 4: Slotted and Solid Serve Different Jobs

Solid strut, usually called plain channel or back plate channel, has no slots. It carries higher load because the web and flanges act as a continuous section rather than a series of interrupted ones.
PropertySlotted strutSolid strut
Fixing positionsUnlimited along lengthWeld or drilled only
Load capacity at mid spanLowerHigher
Mass per metreLowerSimilar
Typical useEquipment rails, framesShort brackets, welded bases
Buyers often order slotted because it is the default and then discover the load table does not cover their span. The P1000 strut channel machine guide covers how wall thickness changes the section properties.
strut channel hanger fitting holding a threaded rod

Fact 5: Load Ratings Depend on Wall Thickness and Span

Channel load tables list safe uniformly distributed load at a stated span. Two channels with the same dimensions but different wall thickness carry different numbers.
Three inputs decide the rating:
  1. Steel grade. S275 and S355 are common European grades. ASTM A653 Gr 50 is the North American equivalent. Higher yield allows a thinner wall for the same load, which cuts mass.
  2. Wall thickness. 2.0 mm and 2.5 mm sections differ enough that the load tables treat them as separate products.
  3. Span and support condition. Doubling the span can cut safe load to roughly a quarter for a simply supported channel.
Coil thickness decisions tie back to profile geometry. The coil width and thickness calculation guide covers how incoming coil limits map to the finished section, and how to select steel coil covers grade and coating choice.
cable ladder supported by strut channel framing

Fact 6: Coatings Decide Service Life, Not Grade

Three coating routes cover almost all strut channel production.
Pre galvanized. Coil arrives coated, usually G90 or heavier, and the line forms it without heat. This is the volume route for indoor and covered framing. Cost sits in the coil, not the line.
Hot dip galvanized. Formed sections are dipped after fabrication. It gives the thickest coating and the best edge protection, but requires a separate dip tank and adds handling.
Electro galvanized. A bright, thin coating used where appearance matters and corrosion exposure is mild. It does not match the cut edge protection of pre galvanized coil.
For any spec, write the coating standard into the contract rather than naming a percentage. ASTM A653 governs pre galvanized sheet in North America, while ISO 1461 covers hot dip coating for export work. Section properties and deflection are set out in Rack Manufacturers Institute load tables.

Fact 7: One Line Serves Both Sizes and Both Products

A strut channel line configured with cassette tooling changes between 41×41 and 41×62 in 2 to 3 hours. The same mill produces slotted and solid by changing the punch, and the same mill can add a second operation for perforations or a welded back plate.
Three numbers define most enquiries: coil width, monthly tonnage, and whether the buyer needs two sizes on one line. The roll forming machine multi-profile comparison sets out the cassette versus quick change decision in detail.

Frequently Asked Questions

Q: What is strut channel used for?

A: Strut channel builds equipment mounting frames, cable tray supports, hangers, pipe supports, and general shop framing. The slots let fittings slide anywhere along the length, so a frame is assembled with bolts and later reconfigured without welding.

Q: What does P1000 mean?

A: P1000 is a designation for a nominal 41 mm cold formed strut channel. Two trade sizes carry it: 41×41 mm and 41×62 mm, both with 2.0 to 2.5 mm wall. The 62 mm version carries more load over longer spans.

Q: What is the standard slot size on strut channel?

A: The common slot is 9 by 38 mm on a 50.8 mm pitch. The slot is wider than any standard bolt so a fitting slides freely until the bolt engages the edge. Tighter pitch gives more fixing points but slows the line.

Q: How is strut channel made?

A: It is cold formed from steel coil by a roll forming machine. The strip passes through progressive roll stations that bend it into channel, an in line press punches the slots, and a flying or servo cut shears it to length.

Q: What coating does strut channel need indoors?

A: Pre galvanized G90 is usually enough for indoor or covered framing, and it costs less because the coil arrives coated. Hot dip galvanizing suits external or coastal exposure. Electro galvanized is for appearance with mild exposure only.

Q: Can one machine make both 41×41 and 41×62?

A: Yes, with cassette roll tooling, in 2 to 3 hours. Slotted versus solid is a punch change on the same line, much faster than a roll cassette swap.

Key Takeaways

  • Strut channel is a cold formed U section with continuous slots on both flanges, and the slots are what make it a building system rather than a length of steel.
  • P1000 covers two trade sizes: 41×41 and 41×62 mm, both with 2.0 to 2.5 mm wall.
  • Slot pitch and wall thickness drive cost and load capacity together. Specify both, not just the size.
  • Slotted carries lower mid span load than solid. Choose by span length, not by habit.
  • Coating decides field life. Write the coating standard into the contract rather than a percentage.

Related reading

The P1000 versus P series strut comparison covers how P1000 stacks up against the P series sections.
For the photovoltaic application, see the solar channel roll forming machine guide. Coil limits and profile geometry are covered in coil width and thickness calculation. Tooling decisions sit in multi spec cassette versus quick change.

Article Changelog

Originally published: October 2, 2026
Last updated: 2026-10-02
Changelog:
  • 2026-10-02: First publish. Built the article as seven numbered standard facts (cold formed process, P1000 sizes, slot geometry, slotted versus solid, load inputs, coatings, one line two products) with two tables, eight FAQ with bold questions, and an answer block. Added EN 10365, ASTM A653 and internal links including the pillar page.
Next Review Triggers:** An EN 10365 revision, a change in ASTM A653 coating availability for 2.0 to 2.5 mm coil, a shift of 20 percent or more in “what is strut channel” search interest, or a new fitting standard from a major channel brand.

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