PG45 90 x 45 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

90 x 45 mm six-slot heavy aluminium strut profile with 10.2 mm grooves and a 10 mm mouth for M10 accessories. Heavy rectangular load beam for machine frames and gantries.

Wholesale Price Quoted per metre against section, finish and quantity per per metre

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	90 x 45 mm
Slot	6 x 10.2 mm groove, 10 mm mouth, 45 mm pitch, 2 per 90 mm face and 1 per 45 mm face, M10
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, about a week longer for anodising
Loading Port	Shanghai, Ningbo, Qingdao
Supply Ability	Extrusion capacity for standard and custom dies, with in-house cutting, machining and anodising
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 90 x 45 mm six slot heavy profile?

What makes it a heavy beam?

The 90 mm depth and the heavy wall. When the 90 mm face is vertical (the strong axis), the second moment of area is around 52 cm4, which is about six times the 45 x 45 mm section. That lets it span much further under a given load, which is why it is used as the load beam in machine frames and gantries.

Why does orientation matter so much?

Because bending stiffness scales with the cube of the depth. With the 90 mm face vertical, the section is 52 cm4; with it horizontal, the depth is only 45 mm and the stiffness drops to about 14 cm4, a factor of 3.7. Using the beam the wrong way round throws away most of its strength.

How does the 45 series differ from the 40 series for this beam?

The 45 series has a 10 mm mouth and M10 accessories, against the 40 series 8 mm mouth and M8. For a heavy beam, the larger M10 fasteners give higher per-slot pull-out, which matters when the beam carries a heavy head or a loaded carriage.

02Section data

Item	Value	Note
Envelope	90 x 45 mm rectangular	depth 90 mm, width 45 mm
Slots	6	10.2 mm groove, 10 mm mouth
Slot layout	2 per 90 mm face, 1 per 45 mm face	45 mm pitch
Fasteners	M10	larger than the 40 series M8
Strong-axis I	approx. 52 cm4	90 mm face vertical
Weak-axis I	approx. 14 cm4	90 mm face horizontal
Weight	approx. 4.85 kg/m	from published specification
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

03Strong axis vs weak axis: the numbers

The 90 x 45 mm section is strongly directional. The stiffness depends on which way the depth points, and the difference is close to a factor of four.

Orientation	Depth (mm)	I (cm4)	Deflection at 500 N, 1 m span
90 mm face vertical (strong)	90	approx. 52	0.32 mm
90 mm face horizontal (weak)	45	approx. 14	1.2 mm

That is why the beam is almost always used with the 90 mm face vertical, as a load beam spanning between columns. The 45 mm width is then the flange, and the two slots on each 90 mm face carry the fixings along the top and bottom edges.

04Three jobs and their limits

The same section is used three ways, and the limits are different for each.

Use	Orientation	Typical span	Typical load
Column (vertical member)	either	up to 3 m	compression, up to 25 kN
Load beam (horizontal)	90 mm face vertical	up to 2 m	500 N to 2 kN centre
Diagonal brace	either	bay diagonal	tension or compression, up to 15 kN

As a column, the beam is limited by buckling, not bending, so orientation matters less. As a beam, it must be oriented with the 90 mm face vertical. As a brace, it carries axial load and both orientations are acceptable, though the strong axis is still preferred where a moment may develop.

05Joining the 90 x 45 to the rest of the frame

The 90 x 45 beam is usually joined to a 45 x 45 or 90 x 45 column with a corner bracket or a machined end plate. Because the beam carries moment, a plain slot nut joint at the corner is not enough; the joint needs a bracket that spreads the load across the full depth of the beam.

Corner brackets: a heavy bracket bolted into the slots of both members, tying the beam to the column across the full 90 mm depth.
Machined end plates: a plate bolted to the beam end and to the column face, used where the beam sits between two columns.
Through-bolts: a long bolt through the beam and column centre bores for a high-tension joint at the corners.

For a gantry, the beam is often tapped at both ends and bolted directly to the uprights with an end plate, which gives the stiffest joint.

06Choosing the 90 x 45 vs the 45 x 45

Choose the 90 x 45

The member spans between supports and carries bending load
The span is over 1 m and deflection must stay low
The beam carries a loaded head, carriage or gantry
You need M10 fasteners for high per-slot pull-out
The frame is a load-bearing machine frame, not a light guard

Choose the 45 x 45

The member is a column or a short link, not a beam
The span is under 1 m and the load is light
You need four faces of fixings on a square section
Weight per metre matters and the 45 x 45 is half the weight
The frame is a perimeter or guard, not a load path

07Failure modes to design out

What goes wrong	Why it happens	Design it out by
Beam is installed on the weak axis	the 90 mm face is horizontal, so depth is only 45 mm	orient the 90 mm face vertical for any spanning member
Beam deflects under a moving load	the span is too long for the 52 cm4 stiffness	add an intermediate column, or step up to a 90 x 90 section
Corner joint opens under moment	a plain slot nut joint cannot carry the beam end moment	use a heavy corner bracket or a machined end plate across the full depth
Nut pulls out at the loaded head	the M10 nut is overloaded at a single point	use multiple nuts along the slot, and a through-bolt at the load point
Beam twists under an off-centre load	the rectangular section has low torsional stiffness	keep the load centred, or add a torsional brace across the section

08What to check before you order

Procurement checklist for the 90 x 45 heavy beam

Confirm the orientation: the 90 mm face must be vertical for any spanning member. Mark it on the drawing.
Confirm the span and load. If the span is over 2 m under a centre load, check whether a 90 x 90 section is needed.
Confirm the joint type: corner bracket or machined end plate, not a plain slot nut joint.
Confirm the end preparation: square cut, tapped ends, or machined end plate.
Confirm the finish: mill for hidden use, anodised for exposed service.
Confirm the quantity in metres. A 6 m bar yields three 1.9 m beams.

09Terms used on this page

Strong axis: The bending orientation with the highest second moment of area. For the 90 x 45, it is with the 90 mm face vertical.
Weak axis: The bending orientation with the lowest second moment of area. For the 90 x 45, it is with the 90 mm face horizontal.
Second moment of area: A geometric property, in cm4, that determines bending stiffness. It scales with the cube of the depth.
End plate: A machined plate bolted to the beam end and the column face, giving a stiff corner joint.
Buckling: The sudden sideways failure of a column under compression, before the material itself yields.

10Questions buyers ask

What is the strong-axis stiffness?

Around 52 cm4 with the 90 mm face vertical. With the 90 mm face horizontal, it drops to about 14 cm4, so orientation is critical.

What fasteners fit?

M10 slot nuts, T-bolts and cover strips from the 45 series range. The 10 mm mouth is larger than the 40 series 8 mm mouth.

Can it be used as a column?

Yes. As a column it is limited by buckling, and both orientations are acceptable. It carries compression up to about 25 kN over a 3 m height.

How is it joined to the frame?

With a heavy corner bracket or a machined end plate across the full 90 mm depth. A plain slot nut joint is not stiff enough at the beam end.

What is the weight per metre?

Approximately 4.85 kg/m, from the published product specification.

Can it be anodised?

Yes. Clear, black, champagne and bronze at 10 to 15 micron.

What we need to quote this section

The section drawing or the profile reference GP-SP-4590H-6S.
The cut length for each beam and the number of beams.
The end preparation: square cut, tapped ends, or machined end plate.
The finish: mill, clear anodised, or a specified colour.
The annual or per-order quantity, in metres or pieces.
Any certification requirement: mill certificate to EN 10204 3.1.

Send those six items and the quotation comes back with the extrusion price, the cutting and machining charge, the finish surcharge and the lead time broken out separately. Browse the full aluminium profile catalogue and the 45 series aluminium profiles range.

Need this heavy beam quoted for your load frame?

Send the section, the cut list, the end preparation and the finish. We quote extrusion, cutting and machining as separate lines.

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