PG40 80 x 40 mm Six Slot Aluminium Strut Profile Heavy Rectangular Beam

OEM / ODM Available Free Sample Available Mill certificate to EN 10204 3.1 on request, RoHS and REACH declarations

80 x 40 mm heavy-wall six-slot aluminium strut profile with four slots on the long faces and two on the short faces. Heavy rectangular beam for bending loads using M8 fasteners.

Wholesale Price Quoted per metre against section, wall thickness and quantity per per metre

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	80 x 40 mm rectangular, heavy-wall, six slots on all faces
Slot	6 x 10.2 mm groove, 8 mm mouth, 2 per long face + 1 per short face, 40 mm pitch, 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	Made to order; small trial lengths available from stock offcuts
Lead Time	Typically 2 to 3 weeks for mill finish, plus 1 week for cutting and drilling, plus a week for anodising
Loading Port	Shanghai, Ningbo, Qingdao
Supply Ability	Extrusion capacity for heavy-wall rectangular beam profiles, with in-house anodising and machining
Payment Terms	T/T 30 per cent deposit, balance against copy of bill of lading; L/C at sight for larger orders
Trade Terms	FOB, CIF, CFR, EXW
Certifications	Mill certificate to EN 10204 3.1 on request, RoHS and REACH declarations

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01What is the 80 x 40 mm heavy six-slot beam?

Why would you choose 80 x 40 instead of 40 x 40?

Because a rectangular section has a strong axis and a weak axis. The 80 x 40 has a second moment of area about 11 cm4 on the strong axis (bending with the 80 mm dimension as height) and about 3.5 cm4 on the weak axis (bending with the 40 mm dimension as height). The four-slot 40 x 40 has about 5.8 cm4 on both axes. So on the strong axis, the 80 x 40 is about 1.9 times stiffer than the 40 x 40, for only 2.4 times the weight.

What makes it the heavy variant?

The heavy variant has a wall thickness of about 3.5 mm, compared to about 2.0 mm on the standard-wall 80 x 40 six-slot. The weight is 3.60 kg/m versus about 2.86 kg/m for the standard. The second moment of area is about 11 cm4 versus about 9.5 cm4. The heavy variant is for applications where the beam must carry a significant bending load without deflection.

What is it used for?

Heavy machine frames, gantry beams, conveyor support rails, workbench tops, and any application where a horizontal beam must span a gap and carry weight. The 80 mm dimension is oriented vertically to use the strong axis for gravity loads.

How many slots and where?

Six slots in total: two on each 80 mm long face and one on each 40 mm short face. This gives fixing positions on all four sides of the beam, so accessories, brackets and panels can be mounted from any direction.

02Section data

Item	Value	Note
Envelope	80 x 40 mm rectangular	2:1 aspect ratio
Slots	6	10.2 mm groove, 8 mm mouth
Slot layout	2+2+1+1	2 per long face, 1 per short face
Slot pitch	40 mm	centre-to-centre on long faces
Centre bore	Phi14 mm typically	for through-bolts or location
Wall	approx. 3.5 mm	heavy-wall variant
Weight	approx. 3.60 kg/m	vs 2.86 kg/m for standard-wall
I strong axis	approx. 11.0 cm4	bending about the 40 mm width
I weak axis	approx. 3.5 cm4	bending about the 80 mm width
Alloy	6063-T5	EN AW-6063
Standard	EN 755-9 / GB/T 6892	wall tolerance +/-0.15 mm
Length	6 m stock	cut to drawing to +/-0.5 mm

The strong-axis to weak-axis stiffness ratio is about 3.1:1. This means the beam is three times stiffer against bending when the 80 mm dimension is vertical. Orient the section so the strong axis resists the primary load.

03Strong axis and weak axis explained

A rectangular section has two bending axes. The strong axis is the one where the taller dimension (80 mm) is the height of the beam. The weak axis is where the shorter dimension (40 mm) is the height. The second moment of area is proportional to the cube of the height, so doubling the height from 40 to 80 increases the stiffness by a factor of about 8 for a solid section, and about 3 for an extruded section with slots.

Orientation	Beam height	I (approx.)	Deflection ratio
Strong axis (80 mm vertical)	80 mm	11.0 cm4	1.0x
Weak axis (40 mm vertical)	40 mm	3.5 cm4	3.1x more
40 x 40 four-slot (reference)	40 mm	5.8 cm4	1.9x more

In practice, this means the beam should be oriented with the 80 mm dimension vertical when it is used as a horizontal span. The deflection under a midspan load is about 3 times less in the strong-axis orientation than in the weak-axis orientation.

04Six-slot layout and accessory mounting

The six slots are distributed across all four faces of the beam. The two 80 mm long faces each carry two slots, and the two 40 mm short faces each carry one slot. This gives fixing positions on every side of the profile.

Face	Slots	Typical use
Top (80 mm)	2 slots	accessory brackets, panel mounting
Bottom (80 mm)	2 slots	support brackets, feet, levelling
Front (40 mm)	1 slot	cable chain, sensors, pneumatic line
Back (40 mm)	1 slot	return cable, secondary mounting

All slots use the same 10.2 mm groove and 8 mm mouth as the standard 40 series, so M8 slot nuts, T-bolts, cover strips, hinges and all standard 40 series accessories fit every slot.

05When to use the heavy six-slot instead of other sections

Choose the heavy 80 x 40 six-slot

You need strong-axis bending stiffness for a horizontal span
The beam carries a significant gravity or payload load
You need fixing positions on all four faces
The frame is a heavy-duty machine base or gantry
Deflection must be kept under 0.5 mm per metre of span

Choose the standard 80 x 40 six-slot

The load is moderate and weight matters more than stiffness
You want the same section at 2.86 kg/m instead of 3.60 kg/m
The frame is a general-purpose structure, not a bending beam
Cost per metre is the primary driver
You need the full range of accessories without the heavy-wall premium

If you need a square section with equal stiffness on both axes, use the 40 x 40 four-slot. If you need an even stiffer beam, consider the 80 x 120 ten-slot. The 80 x 40 six-slot heavy is the mid-range choice for bending loads.

06Deflection and span design

For a simply supported beam with a uniformly distributed load, the midspan deflection is proportional to the load, the span cubed, and the inverse of the second moment of area. With I = 11 cm4 on the strong axis, the deflection of a 1 metre span under a 100 N load is about 0.08 mm. For a 2 metre span under the same load, it is about 0.6 mm.

Span (mm)	Load (N)	Deflection strong axis (mm)	Deflection weak axis (mm)
500	100	0.01	0.04
1000	100	0.08	0.25
1500	100	0.27	0.84
2000	100	0.63	1.96

These are elastic deflection estimates for a simply supported beam. Real frames have fixed or partially fixed ends, which reduces deflection by a factor of about 3 to 5. Use these numbers for comparison between sections, not for final design.

07Failure modes to design out

What goes wrong	Why it happens	Design it out by
Beam is installed in weak-axis orientation	the installer oriented 40 mm vertical by mistake	mark the strong axis on the drawing and on the bar at cut
Excessive deflection under load	the span is too long for the section stiffness	add an intermediate support or use the 80 x 120 section
Slot nuts slip under high load	the 8 mm mouth is too narrow for the load	use double slot nuts or a heavier T-bolt with spring clip
Profile twists under asymmetric load	the load is off-centre and the rectangular section has low torsional stiffness	add a second beam or a cross-brace to form a closed frame
Heavy-wall cost is not justified	the application does not need the extra 0.74 kg/m	use the standard-wall 80 x 40 six-slot at 2.86 kg/m

08What to check before you order

Procurement checklist for the heavy six-slot beam

Confirm the section orientation: the 80 mm dimension is the beam height for strong-axis bending. Mark it on the drawing.
Confirm the wall thickness: heavy variant is about 3.5 mm. Standard is about 2.0 mm. Specify explicitly.
Confirm the slot count and layout: 6 slots, 2 per long face, 1 per short face. All M8, 40 series.
Confirm the finish: mill for hidden structural use, anodised for exposed service. Anodising adds 10 to 15 micron.
Confirm the cut length and quantity in metres or pieces. A 6 m bar yields three 1.8 m beams with 600 mm offcut.
Confirm the deflection requirement: specify the maximum allowable deflection at full load and the span.
Any certification requirement: mill certificate to EN 10204 3.1.

09Terms used on this page

Strong axis: The bending axis where the taller dimension of the section is the beam height. For 80 x 40, the strong axis has I about 11 cm4.
Weak axis: The bending axis where the shorter dimension is the beam height. For 80 x 40, the weak axis has I about 3.5 cm4.
Heavy-wall: A variant with wall thickness about 3.5 mm instead of the standard 2.0 mm. Heavier and stiffer, at 3.60 vs 2.86 kg/m.
Aspect ratio: The ratio of the two section dimensions. The 80 x 40 has a 2:1 aspect ratio, giving a 3.1:1 stiffness ratio between strong and weak axes.
Second moment of area: A geometric property of the cross section that determines bending stiffness. Higher I means less deflection under load.

10Questions buyers ask

What is the 80 x 40 heavy six-slot used for?

Heavy machine frames, gantry beams, conveyor support rails, workbench tops, and any application where a horizontal beam must span a gap and carry weight with minimal deflection.

How does it compare to the standard 80 x 40?

The heavy variant has 3.5 mm wall vs 2.0 mm, weighs 3.60 vs 2.86 kg/m, and has I of 11.0 vs 9.5 cm4. Use the heavy for bending loads, the standard for general framing.

What is the difference between the strong and weak axis?

The strong axis uses the 80 mm dimension as beam height, giving I about 11 cm4. The weak axis uses 40 mm, giving I about 3.5 cm4. The stiffness ratio is about 3.1:1.

Can I use standard 40 series accessories?

Yes. All six slots use the 10.2 mm groove and 8 mm mouth, so M8 slot nuts, T-bolts and all 40 series accessories fit every slot.

What is the weight per metre?

Approximately 3.60 kg/m for the heavy variant, versus 2.86 kg/m for the standard-wall.

Can it be anodised?

Yes. Clear, black, champagne and bronze at 10 to 15 micron. Recommended for exposed surfaces in machine frames.

What is the maximum recommended span?

For a 100 N point load with deflection under 1 mm, the strong-axis span can be up to about 1.5 m. Add intermediate supports for longer spans or heavier loads.

What we need to quote this section

The section drawing or the profile reference GP-SP-4080H-6S.
The cut length for each beam and the number of beams.
The orientation: confirm the 80 mm dimension is vertical for strong-axis bending.
The wall thickness: confirm heavy variant at about 3.5 mm.
The finish: mill, clear anodised, or a specified colour.
The deflection requirement: maximum allowable deflection at full load and the span.
The annual or per-order quantity, in metres or pieces.
Any certification requirement: mill certificate to EN 10204 3.1.

Send those eight items and the quotation comes back with the extrusion price, the machining charge, the finish surcharge and the lead time broken out separately. Browse the full aluminium profile catalogue and the 40 series aluminium profiles range for related sections.

Need this heavy rectangular beam quoted for your machine frame?

Send the section, the orientation, the wall thickness and the finish. We quote extrusion, machining and anodising as separate lines.

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