PG50 100×100 mm Eight Slot Aluminium Strut Profile for Heavy Machine Columns

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

A 100 x 100 mm eight slot PG50 aluminium strut profile with two slots per face on a 50 mm pitch, 6.8 x 6.8 mm M8 corner holes on an 85 mm square and a Ø12 mm M14 centre bore.

Wholesale Price $12.60 - $19.20 / m per m

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	100 x 100 mm
Slot	8 x 10.2 mm groove, 8 mm mouth, 50 mm pitch, two slots per face
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	22-32 days after deposit for mill finish
Loading Port	Shanghai / Ningbo
Supply Ability	200 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 · PG50 column section

A PG50 100 x 100 mm eight slot aluminium strut profile is a square column on a 50 mm slot pitch with a 10.2 mm groove and an 8 mm slot mouth. There are two slots on each face, 50 mm apart, four 6.8 x 6.8 mm corner holes tapped M8 sitting on an 85 mm square, and a Ø12 mm centre bore tapped M14. The flange is 6 mm and the web 13 mm, and the section weighs about 9.2 kg/m. It is supplied in 6063-T5, cut and machined to order.

The thing to notice is that this section carries two fixing sizes, and they are not interchangeable. The M8 corner holes take the cross connections and the brackets; the M14 centre bore takes the structural end connection, with about three times the bolt area. Reading them as one system rather than two is where most frames go wrong.

100 x 100 eight slot section: two slots per face on a 50 mm pitch, 6.8 x 6.8 mm corner holes tapped M8 on an 85 mm square, and a Ø12 mm centre bore tapped M14.

Two fixing sizes, two jobs

The section has eight slots, four corner holes and one centre bore, and the three are sized for different things. Mixing them up is the usual reason a 100 mm column ends up with connections that are either oversized or the weak point of the frame.

Fixing	Size	Bolt area	What it is for
T-slot	10.2 mm groove, 8 mm mouth	M8 slot nut	Anything that has to slide or be adjusted: brackets, rails, panels, clamps
Corner holes	6.8 x 6.8 mm, tapped M8	36.6 mm2	Cross connections, end plates and corner joints, on an 85 mm square
Centre bore	Ø12 mm, tapped M14	115 mm2	The structural end connection: base plates, butt joints, splice plates

The M14 bolt has a tensile stress area of about 115 mm2 against about 36.6 mm2 for the M8. That is a factor of three, and it is the reason the centre bore exists at all: the end of a column is where a frame concentrates its load, and it is the one place where the bolt size should not be trimmed.

The four corner holes sit on an 85 mm square. That is the base plate and end plate pattern: 85 x 85 mm, four M8 fixings. If a matching plate already exists in the design, this is the dimension that has to agree with it.

What the 50 mm pitch changes

The slot itself is the same size as the 40 series: a 10.2 mm groove with an 8 mm mouth, taking M8 nuts. What changes with the 50 series is the pitch and the amount of aluminium between the slots.

	40 series on a 100 mm face	50 series on a 100 mm face
Slot pitch	40 mm	50 mm
Slot centres on the face	40 mm apart	50 mm apart
Slots per face	Two	Two
Web between slots	Narrower	Wider
Corner hole	5 x 5 mm, tapped M6	6.8 x 6.8 mm, tapped M8
Corner hole bolt area	20.1 mm2	36.6 mm2
Centre bore	Ø12 mm, tapped M14	Ø12 mm, tapped M14

Two things are worth taking from that table. The first is that the corner holes grow while the slots do not: the 50 series keeps the same M8 slot but moves the corner fixing from M6 to M8, about 82 per cent more bolt area. The second is that the wider pitch puts more metal between the slots, which is where the bending load in a column actually goes.

The counter-intuitive part

Put the 45 series 90 x 90 mm column next to this one and something unexpected appears: the smaller section has the bigger corner bolt.

	45 series 90 x 90 mm	50 series 100 x 100 mm
Envelope	90 x 90 mm	100 x 100 mm
Slot pitch	45 mm	50 mm
Slot mouth	10 mm	8 mm
Corner hole	8 x 8 mm, tapped M10	6.8 x 6.8 mm, tapped M8
Corner hole bolt area	58.0 mm2	36.6 mm2
Centre bore	Ø12 mm, tapped M14	Ø12 mm, tapped M14
Wall	6 mm flange / 13 mm web	6 mm flange / 13 mm web
Weight	approx. 7.60 kg/m	approx. 9.20 kg/m
Second moment of area	approx. 230 cm4	approx. 380 cm4

The 50 series is not the 45 series with bigger bolts. It is a bigger envelope with smaller corner bolts, and it buys stiffness rather than joint capacity: about 65 per cent more second moment of area for about 21 per cent more weight.

That turns the choice into a question about which part of the frame is failing. If the members are too flexible, go up a section size and accept the M8 corner holes — they are not the problem. If the members are stiff enough but the connections keep slipping, coming loose or needing to be very numerous, the M10 corner holes of the 45 series are the direct answer and a bigger section will not help.

Choose this section when the frame is too flexibleA 100 mm column is about 65 per cent stiffer than a 90 mm one. If the deflection or the sway is what is wrong, this is the fix.

Choose the 45 series when the joints are the weak pointThe 45 series has M10 corner holes with roughly double the tightening torque ceiling. If connections loosen under vibration, that is what changes.

Use the M14 centre bore for the structural endBase plates, butt joints and splice plates belong on the centre bore. Three times the bolt area is not a detail on an anchored column.

Keep the slot nuts M8The slots take the same M8 nuts as the 40 series. Ordering 50 series slot hardware buys nothing here — the slot is the same size.

Specifying a 100 mm column

Check what is actually failing Deflection or sway points at the section; loosening or slipping joints points at the bolt. Decide this before choosing between the 45 and 50 series.
Put the structural connection on the centre bore The M14 bore is the strongest fixing in the section. Use it for the base plate or the butt joint, and keep the corner holes for cross members.
Use the 85 mm square for plates The four M8 corner holes sit on an 85 mm square. Any base plate or end plate drawn for this section has to match that pattern.
Expect M8 nuts in the slots The slot mouth is 8 mm and the groove is 10.2 mm, so 40 series M8 slot nuts fit. There is no separate 50 series nut to order.
Remember the pitch is 50 mm Two slots per face, 50 mm apart. A bracket drilled for a 40 or 45 mm pitch will not line up.
Plan the lift At about 9.2 kg/m a 6 m length is a two-person lift and needs support along its length in storage to stop it taking a set.

Frequently asked questions

What is the difference between the M8 corner holes and the M14 centre bore?

They are two different fixings with different jobs. The corner holes are tapped M8 with about 36.6 mm2 of bolt area and take cross connections and brackets. The centre bore is tapped M14 with about 115 mm2 and takes the structural end connection.

Why does the 50 series have smaller corner bolts than the 45 series?

Because the 50 series buys stiffness, not joint capacity. The 100 x 100 mm section is about 65 per cent stiffer than a 90 x 90 mm 45 series section, but its corner holes are M8 against the 45 series M10.

Which series should I use, 45 or 50?

If the frame is too flexible, use the 50 series for the bigger section. If the frame is stiff enough but the joints slip or loosen, use the 45 series for its M10 corner holes.

Does it take 40 series slot nuts?

Yes. The slot groove is 10.2 mm and the mouth is 8 mm, the same as the 40 series, so standard M8 slot nuts fit.

What is the corner hole pattern?

The four corner holes are 6.8 x 6.8 mm, tapped M8, on an 85 mm square.

Do you machine the base plates?

Yes. We cut to length, face and square the ends, tap the corner holes and the centre bore, and machine base and end plates to the 85 mm pattern. Send DWG, DXF, STEP or PDF.

Send the column load and the plate pattern

Tell us whether the frame is failing on deflection or on the connections, and send the base plate pattern if one exists. We will confirm the section and quote cut lengths with the corner holes and the M14 centre bore machined to your drawing.

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