PG40 80×80 mm Eight Slot Heavy Aluminium Strut Profile High Load Column

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

An 80 x 80 mm eight slot heavy PG40 aluminium strut profile with diamond internal cavities and an 11 mm web. Same envelope as the standard 80 x 80, about half again the stiffness.

Wholesale Price $7.40 - $11.80 / m per m

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	80 x 80 mm
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	150
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 heavy column

A PG40 80 x 80 mm eight slot heavy aluminium strut profile is a square column with 8 x 10.2 mm slots on a 40 mm pitch, an 8 mm slot mouth taking 40 series M8 hardware, 5 mm corner holes tapped M6 and a Ø12 mm bore tapped M14. The flange is 4 mm and the web 11 mm, the outer slots are 40 mm apart, and the internal cavities are formed as diamonds rather than squares. It weighs about 6.8 kg/m against roughly 4.5 kg/m for a standard wall 80 x 80 mm section, and it is supplied in 6063-T5.

Two 80 x 80 mm profiles can look identical from the outside and behave very differently, and this section is the example. The envelope is the same, the slot layout is the same, and every bracket that fits a standard 80 x 80 mm section fits this one. What has changed is the wall thickness and the shape of the cavities inside, and the consequence is a stiffer column for about half again the weight. Whether that is a bargain or a waste depends on one thing: whether the column is actually stiffness-limited.

80 x 80 heavy section: the same envelope as a standard 80 x 80, with thicker walls and diamond-shaped internal cavities.

Same envelope, different inside

A T-slot profile is mostly void. In a standard-wall 80 x 80 mm section the aluminium occupies perhaps a quarter of the 80 x 80 envelope, and the rest is slot mouths, grooves and internal cavities. That leaves a great deal of room to redistribute material without changing the outside at all, and that is exactly what a heavy section does.

	Standard 80 x 80 mm	Heavy 80 x 80 mm
Envelope	80 x 80 mm	80 x 80 mm
Slots	8 x 10.2 mm on a 40 mm pitch	8 x 10.2 mm on a 40 mm pitch
Flange	Thinner	4 mm
Web	Thinner	11 mm
Cavity shape	Square cavities	Diamond cavities
Weight	approx. 4.5 kg/m	approx. 6.8 kg/m
Bending stiffness	Reference	About half again as stiff
Torsional stiffness	Reference	Substantially higher

Every bracket still fits. Because the envelope and the slot layout are unchanged, a heavy section is a drop-in replacement for a standard one. That is what makes it useful: you can upgrade a frame’s stiffness without redesigning any of the connections.

What a diamond cavity does that a square one cannot

The cavity shape is the interesting part, because it is not cosmetic. Three things change when the internal cells are rotated to a diamond.

First, the webs triangulate the section. A square cell can rack into a parallelogram under torsion; a diamond cell, whose walls are at 45 degrees to the slot axes, cannot rack without changing the length of a side. That is why the torsional stiffness improves far more than the bending stiffness does — and torsion is what a column sees when it is loaded off-centre.

Second, the cavity corners move away from the slot roots. On a square-cavity section the cavity corner and the slot root can end up close together, which leaves a thin ligament where the stress concentrates. Rotating the cavity puts the corner where there is no slot, so the slot root stays properly supported.

Third, the webs can be made thicker without intruding into the slot cavity. That is what allows the 11 mm web of this section while keeping the slot geometry identical to the standard version.

Triangulated cellsDiamond cavities resist racking, so the section is much better in torsion than a square-cavity section of the same envelope.

Better supported slot rootsMoving the cavity corners away from the slot roots keeps material where the clamping load goes.

Thicker webs, same slotsThe 11 mm web fits without changing the slot geometry, so all standard hardware still works.

Same outside dimensionsNo redesign of brackets, covers or end plates is needed when you upgrade.

When the heavy version earns its weight

The extra weight costs money three times: in the material, in the freight, and in the handling during assembly. So it is worth being clear about when it pays. The rule is that a heavy section is worth it when the column is stiffness-limited, and it is not worth it when the column is strength-limited or when a bigger envelope is available.

Situation	Verdict	Reason
Column is stiffness-limited and the envelope is fixed	Use the heavy section	Same outside, about half again the stiffness, and no redesign
Column sees torsion from an off-centre load	Use the heavy section	The diamond cavities give the biggest gain in torsion
Column is strength-limited only	Standard section	Adding material where stress is not the problem buys nothing
A larger envelope will fit	Step up a size instead	Depth is a far cheaper way to buy stiffness than wall thickness
Frame is a light guard or a cover	Standard section	The extra stiffness has no function on a non-structural member

That fourth row is the one people miss. Stiffness goes with the cube of the depth, so moving from 80 x 80 mm to 100 x 100 mm buys far more than doubling the wall thickness does, and it often costs less weight. The heavy 80 x 80 mm section is the right answer when the envelope is genuinely fixed — inside a machine, behind a panel, or where a cover has to close over it.

Specifying a heavy column

Work out whether the column is stiffness or strength limited If the deflection or the twist is what fails first, it is stiffness-limited and the heavy section helps. If it is the stress, the heavy section does not.
Check whether a larger envelope will fit If it will, compare the cost and weight of going up a size against going up a wall. Depth usually wins.
Use the M14 bore for the structural connection The Ø12 mm bore tapped M14 is the strongest fixing point in the section. Keep the slots for adjustable items and brackets.
Consider the weight during handling At 6.8 kg/m an 80 x 80 mm heavy column is a two-person lift in a long length. That matters on an installation where the frame is built on site.
Keep the torque at the slot ceiling About 15 N m for an M8 nut in a 40 series groove. A heavier wall does not raise the slot ceiling, because the limit is the lip, not the bolt.

Frequently asked questions

What is the difference between this and the standard 80 x 80 mm section?

Wall thickness and cavity shape. This section has a 4 mm flange, an 11 mm web and diamond cavities, at about 6.8 kg/m against roughly 4.5 kg/m. The outside and the slot layout are identical, so brackets interchange.

How much stiffer is it?

About half again in bending and considerably more in torsion, because the diamond cavities triangulate the cells. Send us the load case and we will give you the deflection figures for both sections so you can compare.

Should I use this or a 100 x 100 mm section?

If a 100 x 100 mm envelope will fit, use it. Depth buys stiffness far more efficiently than wall thickness. The heavy 80 x 80 mm section is for when the envelope cannot change.

Does the heavier wall mean I can torque the bolts more?

No. The torque ceiling is set by the slot lip rather than by the wall, so an M8 nut in a 40 series groove is still limited to about 15 N m on this section.

Can you supply it machined?

Yes. We cut to length, face and square the ends, drill and tap the corner holes and the M14 bore, and supply end caps and covers.

Send the column load and the available envelope

Tell us the load, the height and whether the space around the column is fixed. We will compare the heavy 80 x 80 mm section against going up a size and quote the better answer.

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