PG40 120×40 mm Eight Slot Aluminium Strut Profile Standard Beam for Table Frames

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

A 120 x 40 mm eight slot PG40 aluminium strut profile standard beam with three slots on the 120 mm face. For table frames, machine cross beams and rail support beams.

Wholesale Price $5.40 - $8.80 / m per m

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	120 x 40 mm
Slot	8 x 10.2 mm groove, 8 mm mouth, 40 mm pitch, outer pair 80 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	300 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 beam

A PG40 120 x 40 mm eight slot aluminium strut profile is a wide beam with a 40 mm slot pitch, a 10.2 mm groove and an 8 mm slot mouth, taking 40 series M8 hardware. The 120 mm face carries three slots at 40 mm centres with the outer pair 80 mm apart, the corner holes are 5 x 5 mm tapped M6 and the Ø12 mm bore is tapped M14. The flange is 4 mm and the web 11 mm, and the section weighs about 4.6 kg/m. It is supplied in 6063-T5, cut and machined to order.

The reason to pick a 120 x 40 mm section over a 40 x 120 mm one, or over a plain 80 x 40 mm beam, is the number of separate mounting lines it puts on one face. Three slots at 40 mm centres means three functions can share a single member without any of them competing for space — a rail on one outer slot, an accessory run on the centre slot and a cable route on the other outer slot. Working out which function goes on which slot before you drill anything is the whole design of a table frame.

120 x 40 eight slot section: three slots at 40 mm centres on the 120 mm face, outer pair 80 mm apart.

Three mounting lines on one face

The 120 mm face carries three slots: one central and two outer, with the outer pair 80 mm apart and every slot 40 mm from its neighbour. That geometry is worth using deliberately rather than treating the three slots as interchangeable, because they are not — the outer pair is where the load path wants to be, and the centre is where the middle of the beam is.

Slot on the 120 mm face	Position	What it is good for
Outer slot, near edge	40 mm from the centre slot	Linear rails, guideways and anything that sets a datum
Centre slot	On the beam centreline	Accessory brackets, sensor mounts and adjustable items
Outer slot, far edge	40 mm from the centre slot	Cable cleats, air lines and slot covers

Two rails want the two outer slots. A pair of linear rails on one beam should go in the outer slots, because that puts the greatest possible distance between them and therefore the greatest resistance to the carriage rocking. Putting both rails in adjacent slots wastes the width you paid for.

One face, three jobs: a layout that works

Here is a layout that uses all three slots on a table frame beam without any of the items interfering, and it is worth copying because it comes up on almost every machine table.

Outer slot A — the datumA linear rail, a guide strip or a locating edge. It sets the geometry of the machine, so it is bolted first and never adjusted afterwards.

Centre slot — the adjustablesProximity sensors, stops, clamps and mounting brackets that have to be moved as the job changes. The centre slot is the easiest to reach with a hex key from above.

Outer slot B — the servicesCable cleats, pneumatic line clips and a slot cover. Running the services in the outermost slot keeps them clear of the working area and lets you close the slot with a cover.

The remaining slots on the other faces are then free for the frame connections, which is what keeps the node count down. On a table frame the cross members usually land on the 40 mm faces, so the 120 mm face stays available for the working surface.

Sizing a table frame beam

A table cross beam carries a distributed load — the table top, the fixtures on it and whatever the machine puts through it. The table below is for a simply supported beam under a uniformly distributed load at an L/500 limit, using the section’s 220 cm4.

Span	Maximum total distributed load at L/500	Deflection at a 3 kN total load	Verdict
1.0 m	approx. 23.7 kN	approx. 0.3 mm	Comfortable
1.2 m	approx. 16.4 kN	approx. 0.4 mm	Comfortable
1.5 m	approx. 10.5 kN	approx. 0.9 mm	Inside the limit
2.0 m	approx. 5.9 kN	approx. 2.0 mm	Right at the limit
2.5 m	approx. 3.8 kN	approx. 4.0 mm	Outside the limit

Two things follow. First, a 120 x 40 mm beam is comfortable at a 1.5 m span for a normal table load and marginal at 2.0 m. Second, the section has to be mounted with the 120 mm dimension vertical — laid flat it uses only its 40 mm depth and the stiffness drops by a factor of nine.

Building a table frame

Decide which slot is the datum before you cut anything The rail or the locating edge goes in an outer slot, and its position sets everything else. Fix that first on the drawing.
Cut the two long beams as a pair The two long beams of a table frame have to be identical to keep the rails parallel. Cut them in one setup and keep them together.
Fit the datum rail before the table top It is much easier to set a rail on an open frame than to work around a top that is already in place.
Mount the beams on edge With the 120 mm dimension vertical. Laid flat the beam is about nine times softer and the table will not hold position.
Keep the M14 bore for the frame connections Use the Ø12 mm bores tapped M14 for the corner and cross member connections, and leave the slots for the working items.

Frequently asked questions

What is the difference between this and the heavy version?

Internal wall thickness and the corner hole form. The heavy version has round M6 corner holes and thicker webs, for tapped connections and machine bases. This standard version is for beams that only carry bracket connections through the slots.

How many slots are there in total?

Eight. Three on the 120 mm face, and the remaining five distributed on the 40 mm faces and the other 120 mm face, all on the same 40 mm pitch.

Can I mount a linear rail on this beam?

Yes, and the outer slots are the right place for it. Two rails should go in the two outer slots to maximise the distance between them.

What is the maximum span?

At a 3 kN distributed load and an L/500 limit, about 2.2 m. Send us the span, the load and the tolerance and we will calculate it for this section.

Do you supply it cut and machined?

Yes. We cut to your cutting list to plus or minus 0.5 mm, face and square the ends, drill and tap the corner holes and the M14 bore, and supply end caps and slot covers.

Send the table layout and the items sharing the beam

Tell us the span, the load and which items share each beam. We will confirm the section, suggest the slot layout and quote cut lengths, machining and covers.

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