PG40 80×40 mm Six Slot Aluminium Strut Profile Standard Wall Beam

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

An 80 x 40 mm six slot standard wall PG40 aluminium strut profile. Two slots on each 80 mm face at the 40 mm pitch for joints that resist rotation, plus one slot on each 40 mm face for cross members.

Wholesale Price $4.60 - $7.20 / m per m

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	80 x 40 mm
Slot	6 x 10.2 mm groove, 8 mm mouth, 40 mm pitch, 2 slots per 80 mm face and 1 per 40 mm face, 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	300
Lead Time	18-28 days after deposit for mill finish
Loading Port	Shanghai / Ningbo
Supply Ability	400 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 standard wall beam

A PG40 80 x 40 mm six slot aluminium strut profile is the standard wall beam of the 40 series range. Six 10.2 mm grooves with an 8 mm mouth are cut on a 40 mm pitch: two on each 80 mm face and one on each 40 mm face. The corners carry 5 x 5 mm bores and the web carries a 12 mm bore tapped M14 at the end. It weighs about 3.05 kg/m and is supplied in 6063-T5.

The 80 x 40 section is the workhorse of the range because it is the smallest beam that still puts two mounting positions on its working face. Those two slots are 40 mm apart, which is exactly one 40 series accessory pitch, so a bracket, a joining plate or a linear rail can be fixed in two places instead of one. That single detail is what makes the difference between a joint that holds and a joint that slowly rotates.

80 x 40 standard wall section: two grooves on each 80 mm face at the 40 mm pitch, one on each 40 mm face.

Two slots are not twice one slot

A single bolt in a single slot is a pivot. Whatever is bolted on can rotate about that bolt until something else stops it, and in a T-slot frame there is usually nothing else. The rotation is small at first, but it works the fixing loose, and a loose fixing in an aluminium groove deforms the slot lip.

Two bolts in two slots are a joint. The pair resists rotation directly, so the load path is a force and a moment rather than a force and a hope. On the 80 x 40 section the two slots on each 80 mm face are 40 mm apart, which is far enough apart for the couple to be effective even with modest bolt torque.

Fixing arrangement	Resists rotation?	Load per bolt	Where it is acceptable
One bolt, one slot	No, it pivots	All of it	A purely locating pin, or a joint with a second positive stop
Two bolts, two slots on one face	Yes	Half each	The standard joint on this section
Two bolts, two faces	Yes, and resists twist about the beam	Half each	A bracket at a corner
Four bolts, two per face	Yes, strongly	A quarter each	A cantilever bracket or a rail end
One bolt plus a pin in a corner bore	Yes	Bolt carries shear, pin stops rotation	Where the groove is occupied

A cantilever clamped in one slot will droop. Not because the section is weak, but because the joint rotates. On any bracket that sticks out more than about 150 mm, use two slots. It costs one extra bolt and it removes the whole failure mode.

Span against load

The figures below are for a simply supported beam at an L/500 deflection limit, which is the usual limit for a frame where alignment matters. On edge means the 80 mm dimension vertical, which is the way this section is almost always used.

Span	On edge, distributed	On edge, central point	Flat, distributed	Flat, central point
0.6 m	approx. 8.4 kN	approx. 5.2 kN	approx. 3.2 kN	approx. 2.0 kN
0.8 m	approx. 4.7 kN	approx. 2.9 kN	approx. 1.8 kN	approx. 1.1 kN
1.0 m	approx. 3.0 kN	approx. 1.9 kN	approx. 1.2 kN	approx. 0.72 kN
1.2 m	approx. 2.1 kN	approx. 1.3 kN	approx. 0.81 kN	approx. 0.50 kN
1.5 m	approx. 1.3 kN	approx. 0.83 kN	approx. 0.52 kN	approx. 0.32 kN
2.0 m	approx. 0.75 kN	approx. 0.47 kN	approx. 0.29 kN	approx. 0.18 kN

Note how quickly the flat figures fall away. Laid flat the section has about 24 cm4 against roughly 62 on edge, a factor of 2.6, so the same beam carries about a third of the load. A beam that is fine on edge at 1.5 m and gets installed flat will sag visibly.

Where the 40 mm face is used

The single slot on each 40 mm face is often treated as spare capacity, and on a simple frame it is. But it has three specific jobs that the 80 mm face cannot do.

The first is the perpendicular joint. When a 40 x 40 post meets the side of an 80 x 40 beam, the post’s end has to land on the 40 mm face, and a slot there gives the bracket somewhere to bolt. The second is a panel edge. A panel fixed to the 80 mm face would cover the two working slots; fixed to the 40 mm face it leaves them free. The third is a cross member coming in at right angles part way along the beam, which is a very common requirement in a machine guard.

Standard, light or heavy

The 80 x 40 section is made in three walls, and the choice between them is usually made on the wrong grounds. The table below sets out what actually changes.

	Super light	Light	Standard	Heavy
Weight	approx. 2.10 kg/m	approx. 2.55 kg/m	approx. 3.05 kg/m	approx. 3.60 kg/m
Stiffness, on edge	approx. 43 cm4	approx. 52 cm4	approx. 62 cm4	approx. 74 cm4
Stiffness, flat	approx. 17 cm4	approx. 20 cm4	approx. 24 cm4	approx. 29 cm4
Tapped corner bores	No	Marginal	With care	Yes
Slot torque ceiling, M8	8-10 N m	10-12 N m	About 15 N m	About 18 N m
Best for	Covers, display frames	Panels, light guards	General machine framing	Concentrated loads, tapping

The stiffness range across the four walls is only 1.7 to 1. The weight range is the same 1.7 to 1. So on this section, choosing a heavier wall buys stiffness and weight in the same proportion — it does not make the section more efficient. What the heavy wall does buy that the others cannot is the ability to tap a thread and to clamp a nut hard without deforming the slot lip.

Frequently asked questions

Why does the 80 mm face have two slots?

Because two slots 40 mm apart let a bracket or a rail be fixed at two points, which is what stops the fitting rotating. One slot is a pivot; two slots are a joint. The 40 mm spacing is one 40 series accessory pitch, so standard parts line up with both.

What is the single slot on the 40 mm face for?

Perpendicular joints, panel edges and cross members. When a post or a cross member comes in at right angles to the beam, it lands on the 40 mm face, and the slot there is what the bracket bolts into.

Which wall thickness should I choose?

Standard for general machine framing. Light where the beam is carrying panels or light guards rather than a machine. Heavy only where the load is concentrated or the design needs a tapped thread. On this section the walls differ by only 1.7 to 1 in stiffness, so the wall is not the lever that fixes a deflection problem.

How far can it span?

On edge at an L/500 limit, about 1.5 m for a 1.3 kN distributed load or about 0.83 kN central. Beyond 1.5 m the section starts to want a mid support rather than a heavier wall.

Can I tap the corner bores?

On the standard wall, with care — the 5 x 5 mm corner bores are primarily clearance holes. If the design depends on a tapped connection, the heavy wall is the version that supports it properly.

Send the span, the load and the orientation

Tell us the span, the load and whether the beam runs on edge or flat. We will confirm the section and, if it is marginal, say whether a mid support or a deeper section is the better answer.

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