PG30 30×30 mm Two Slot Type A Aluminium Strut Profile Closed Face T-Slot Extrusion

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

30 x 30 mm Type A two slot PG30 aluminium strut profile in 6063-T5 with 8.2 mm grooves on adjacent faces and two closed faces meeting at one corner. For edge members, seal carriers and datum rails.

Wholesale Price $1.70 - $2.85 / m per m

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	30 x 30 mm
Slot	2 x 8.2 mm groove, 6 mm mouth, adjacent faces, 23 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	500
Lead Time	15-25 days after deposit for mill finish
Loading Port	Shanghai / Ningbo
Supply Ability	600 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 · PG30 Type A

A 30 x 30 mm Type A two-slot strut profile is a square aluminium extrusion with a T-slot on two of its four faces. What makes it Type A is that those two slots are on adjacent faces, not opposite ones: the section therefore carries two solid, unslotted faces, and those two solid faces meet at a single corner. The groove is 8.2 mm with a 6 mm mouth and a 23 mm slot pitch, so it takes 30-series M8 hardware. The centre bore is Ø10 mm tapped M12, the corner holes are Ø4.5 mm tapped M6, and the wall runs 2.2 mm at the flange and 8 mm through the web. We extrude it in 6063-T5 and supply it cut, drilled, tapped or machined.

Most framers choose a section by counting slots and stop there. On a two-slot section that is not enough, because two slots can be arranged two ways and the two arrangements are not equivalent. Type A leaves you a closed corner to work with; Type B leaves you two closed faces on opposite sides. This page is about the closed corner — when you actually need a solid face, and why the asymmetry it creates has to be accounted for in the frame layout.

30 x 30 Type A section: slots on two adjacent faces, two closed faces meeting at the lower corner, 23 mm pitch and an M12 centre bore.

Adjacent or opposite: what Type A actually means

Take a 30 x 30 square and put a T-slot in two of its four faces. If the two slots are on faces that touch, you have Type A. If they are on faces that face each other, you have Type B. The outside dimensions, the groove, the pitch and the weight are identical, which is why the two are so often confused on a drawing — but the sections behave differently and they cannot be substituted for one another without reworking the frame.

The consequence of the adjacent arrangement is that the two solid faces also touch, meeting at one corner. That corner is the only part of the outside of the section that presents two flat, uninterrupted surfaces at right angles to each other. On a Type B section the two solid faces are on opposite sides and never meet, so there is no such corner.

Property	Type A (this section)	Type B
Slot positions	Two adjacent faces	Two opposite faces
Closed faces	Two, meeting at one corner	Two, on opposite sides
Symmetry	Asymmetric about the face centrelines	Symmetric
Best as	Edge member, seal carrier, datum rail	Corner post, upright
Slot groove	8.2 mm, 6 mm mouth	8.2 mm, 6 mm mouth
Slot pitch	23 mm	23 mm
Centre bore	Ø10 mm, tapped M12	Ø10 mm, tapped M12
Weight	approx. 0.86 kg/m	approx. 0.86 kg/m

The closed face is a feature, not a shortage

On an all-slotted section every face is interrupted by a groove, and a groove is a place where a gasket cannot sit flat, a dowel cannot be pressed, and a dial indicator cannot be run. The closed faces on a Type A section solve all three problems at once, and that is the whole reason the section exists.

Seal carrierA gasket or a foam seal needs a continuous flat land to compress against. On a slotted face the seal bridges the groove and leaks at every fixing. Run the seal along the closed face and the compression is uniform.

Datum faceWhen two members have to be set square to each other, the reference has to be a machined flat, not a slot mouth. The closed corner gives two flat datums at exactly 90 degrees, which is what a square or a dial gauge needs to sit on.

Dowel and pin locationA locating pin, a roll pin or a shoulder bolt needs a solid wall to sit in. The 8 mm web behind the closed corner will take a reamed hole that the 2.2 mm flange never could.

The asymmetry nobody mentions

Because the two slots sit on adjacent faces, the Type A section is not symmetric about its face centrelines — it is symmetric about the diagonal that runs through the closed corner. In practice that means the closed corner is the stiff side of the member and the open corner is the soft one. A bending load applied across the closed corner is carried by the full depth of the section; the same load applied across the open corner finds less material resisting it.

This matters when a member is used as an edge rail on a frame that also acts as a guard rail or a handrail, because the load arrives from one direction only. Put the closed corner towards the load and the member is noticeably stiffer than the same section the other way round. It is a free improvement — the section costs the same either way — but it has to be decided at the drawing stage, because once the frame is assembled the orientation is locked in.

Drawing rule: on a Type A member, mark the closed corner on the drawing with a small triangle. It fixes both the seal land and the stiff axis in one mark, and it removes the most common assembly error on this section.

Where the closed corner belongs on a real frame

Put the closed corner on the outside of the frame On a guard, an enclosure or a door frame the closed faces should face outward, where the seal and the visible surface are, and the slots should face inward where the fixings are.
React the load on the closed corner Where the member carries a one-directional load — a handrail push, a door weight, a panel pull — orient the closed corner towards it. The section is stiffer that way and the fixings are in compression rather than prying.
Keep the datum corner clear of fixings If the closed corner is used as a datum for setting the frame square, do not put a fixing through it. A bolted joint pulls the surfaces together and destroys the reference you were relying on.
Never mix A and B in one continuous member The two sections join at the end faces, but the slot pattern does not line up and the closed faces do not meet. Where a frame changes from an edge member to an upright, make the change at a joint, not mid-member.

Related 30-series sections: the three-slot Type A and the fully slotted four-slot section, both on the same 23 mm pitch.

Frequently asked questions

What is the difference between Type A and Type B 30 x 30?

Only the arrangement of the two slots. Type A has them on adjacent faces and leaves a closed corner; Type B has them on opposite faces and leaves two closed faces on opposite sides. The outside dimensions, groove, pitch and weight are the same.

Can I use it as a corner post?

It is possible but not ideal. A corner post is better served by a symmetric section, because the load arrives from two directions and the symmetric section responds the same way to both. Type A is at its best as an edge member where the load has a known direction.

Does the closed face take a thread?

The 8 mm web behind the closed corner will take a shallow tapped hole for a light duty fixing, but the flange is only 2.2 mm and will not. For anything carrying load, use the Ø4.5 mm corner holes tapped M6 or a T-slot nut in one of the open slots.

Which M8 hardware fits the 8.2 mm groove?

Standard 30-series T-slot nuts, hammer-head bolts and slot covers, all sized for the 8.2 mm groove and the 6 mm mouth. The centre bore takes M12 hardware and the corner holes take M6.

Do you supply it anodised?

Yes, clear or black anodising in a class to suit the application, typically 10 to 20 microns. Where a nut has to slide freely, specify the anodising class at enquiry because the anodic layer does affect a tight sliding fit.

Send the frame drawing with the closed corner marked

Tell us where the seal runs and which way the load arrives. We will confirm whether Type A or Type B is the right section, then quote cut lengths, machining and FOB pricing.

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