PG40 80×80 mm L-Shape Eight Slot Aluminium Strut Profile Corner Section

OEM / ODM Available Free Sample Available ISO 9001:2015 EN 755-9 RoHS REACH

An 80 x 80 mm L-shape eight slot PG40 aluminium strut profile corner section that forms two faces of a column at once, removing the corner node entirely.

Wholesale Price $3.40 - $5.60 / m per m

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	80 x 80 mm L cross section
Slot	8 x 10.2 mm groove, 8 mm mouth, 40 mm pitch, outer pair 40 mm apart, M8
Length	6 m stock, cut to drawing to +/-0.5 mm
Tolerance	EN 755-9 / GB/T 6892, wall +/-0.15 mm
Surface	Mill finish / clear anodised / black anodised
MOQ	200
Lead Time	20-30 days after deposit for mill finish
Loading Port	Shanghai / Ningbo
Supply Ability	250 t per month
Payment Terms	T/T 30% deposit + 70% before shipment \| L/C at sight
Trade Terms	FOB \| CIF \| EXW
Certifications	ISO 9001:2015 \| EN 755-9 \| RoHS \| REACH

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Structural framing · PG40 corner section

A PG40 80 x 80 mm L-shape eight slot aluminium strut profile is a corner section that forms two faces of a square column at right angles. It has eight 10.2 mm slots on a 40 mm pitch with an 8 mm mouth taking 40 series M8 hardware, 5 x 5 mm corner holes tapped M6 and a Ø12 mm bore tapped M14. The flange is 4 mm, the web 11 mm, the outer slots are 40 mm apart and the section weighs about 3.4 kg/m.

What makes the L section useful is that it removes a node. A conventional corner needs two square columns meeting at right angles, a bracket or a joining plate to hold them, and the labour to assemble it. The L section is one member that already is the corner, so the joint disappears. What it brings instead is eccentricity: the centre of the section is not the centre of the 80 x 80 envelope, and that offset has to be dealt with.

80 x 80 L section: two 80 mm legs at right angles in one extrusion, with eight 10.2 mm slots and a 4 mm flange.

One member instead of two, and no node

Compare the two ways of building a corner of a cabinet, a guard or a machine enclosure. The conventional way uses two square 40 x 40 mm columns, cut to length, plus a bracket or a joining plate at the corner, plus the bolts. The L section does it with one member cut to length and bolted to the members above and below it.

	Two square columns plus a node	One L section
Members at the corner	2	1
Corner connection hardware	Bracket or joining plate plus bolts	None
Assembly operations	Two members aligned and clamped, then jointed	One member positioned
Outer surface	Two members with a seam at the corner	Continuous, no seam on either outer face
Weakness	The joint is the weak point	No joint to be weak

The seam is the part that matters visually. On two square members meeting at a corner there is a visible line where they meet, and unless both are cut and aligned perfectly it is also a visible step. An L section has a continuous outer surface on both faces, which is why it turns up on door frames, display frames and enclosures where the corner is on show.

The price: the section is eccentric

The centroid of an L is not where you would expect. Take an 80 x 80 mm L with 4 mm legs: the area is about 624 mm2 and the centroid sits roughly 20 mm in from each of the two outer faces. The geometric centre of the 80 x 80 envelope is 40 mm from each face, so the centroid is offset by about 28 mm along the 45 degree diagonal — toward the corner.

That offset matters because loads rarely act through the centroid. A load applied at the geometric centre of the envelope, which is where a designer naturally puts it, is 28 mm eccentric. The eccentricity turns the load into a load plus a moment, and the moment has to be carried by the section and by the connection at the ends.

An L is stiff, but not about the axis you think. The principal axes of an L are rotated 45 degrees to the legs. Its stiffness about the two leg directions is not the same as its stiffness about the diagonals, so a simple square-section calculation will be wrong. Send us the load case and we will confirm the section.

Three ways to handle the eccentricity

Load through the centroidMove the load path so it passes through the centroid rather than through the geometric centre. Often done by offsetting the bracket that carries the load, and usually the cheapest fix.

Brace the corner with a diagonalA diagonal stay across the inside of the corner converts the eccentric bending into a direct tension or compression in the stay, which is far more efficient than carrying it as bending in the legs.

Design for the momentAccept the eccentricity and check the section and the end connections against the combined load and moment. Viable where the load is modest, and the honest answer on a light frame.

The one approach to avoid is ignoring it. An L section carrying a load at its geometric centre is a member in combined bending and compression, and a frame designed as though the load were concentric will show the error as a lean rather than as a failure — the frame will stand, but it will not be straight.

Using an L section well

Decide which two faces are the outer ones The L has two legs and therefore two outer faces. Work out which two sides of the finished structure they are before you order, because the slots are arranged around the legs.
Put the structural connection in the M14 bore The Ø12 mm bore tapped M14 is the strongest fixing in the section. Use it for the load-bearing end connection and keep the slots for panels and trim.
Keep the load near the corner The centroid is close to the corner, so a load applied near the inside corner is much closer to concentric than one applied near the open ends of the legs.
Close the open side if it is visible The L leaves one side of the column open. On a visible frame, close it with a cover profile or a flat panel, or accept the open slot as a design feature.
Check the frame for lean, not just for strength Because the section is eccentric, the symptom of an error is a frame that leans rather than one that fails. Check verticality after assembly, not just that everything is tight.

Frequently asked questions

Where would I use an L section rather than two square columns?

Anywhere a corner is visible, and anywhere the node count matters. Door and window frames, machine enclosure corners, display frames and cabinet corners are the usual applications.

How much weaker is it than two 40 x 40 mm columns?

It is not weaker, it is differently shaped. The L has more material in the corner, where a corner joint needs it, and no joint to fail. Its limit is the eccentricity, not the section.

Can I bolt panels into the open side?

Yes. The slots on the inside of the legs are accessible and take standard 40 series hardware, so a panel can be fixed from the inside face.

Does the L come in other sizes?

The 45 series range includes a 90 x 90 mm L section. Tell us the envelope you need and we will confirm what is available or quote a custom die.

Can you supply it mitred?

Yes. We cut and mitre to your cutting list, and we can supply the corner already formed if you send the frame drawing.

Send the corner detail and the load position

Tell us which two faces of the structure the L has to form and where the load acts. We will confirm the section, suggest how to deal with the eccentricity and quote cut or mitred lengths.

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