Aluminium Angle Profile 40 x 40 x 5 mm Solid Equal Leg Corner Section

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

Equal leg 40 x 40 x 5 mm extruded aluminium angle at about 1.01 kg/m with an R3.5 heel. Supplied in 6063-T5 for visible trim or 6061-T6 where the angle carries load or is welded.

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

Material	Aluminium
Alloy Grade	6063-T5 for appearance, 6061-T6 for load
Temper	T5
Section Size	40 x 40 x 5 mm
Slot	Not applicable, this is a solid equal leg L section with no slot
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, champagne, bronze, black or brushed anodised
MOQ	800 m
Lead Time	Typically 20 to 32 days after deposit, longer for a colour matched anodised batch
Loading Port	Shanghai, Ningbo, Qingdao
Supply Ability	Extrusion, cutting, machining and anodising in house
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	ISO 9001:2015, EN 755-9, RoHS and REACH declarations

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The equal leg section. Both legs are 40 mm and 5 mm thick, with an R3.5 radius at the heel where the two legs meet.

01What is a 40 x 40 x 5 mm equal leg angle?

What makes it different from a T-slot profile?

It has no slot at all. Both legs are solid 5 mm aluminium, joined at a heel with an R3.5 internal radius. That means you cannot slide a nut into it, and in exchange you can drill, tap, weld, notch and bend it anywhere along its length. It is a piece of structural trim rather than a framing member.

When is the solid angle the right choice?

When the angle is doing one of three jobs: covering a corner, carrying a modest load across a short span, or giving you somewhere to drill that a hollow section cannot. If you need to bolt accessories onto it at arbitrary positions later, buy a slotted section instead.

Why is there a choice of alloy?

6063-T5 gives the better surface and is the standard choice for trim that will be seen and anodised. 6061-T6 has roughly double the yield strength and is weldable, so it is the choice when the angle carries load or is welded into an assembly. The two look the same in section and differ in what you are allowed to do with them afterwards.

02Section data

Item	Value	Note
Envelope	40 x 40 x 5 mm	equal leg L section
Leg thickness	5 mm	nominal, both legs equal
Cross-section area	approx. 375 mm2	two legs less the overlap at the heel
Heel radius	R3.5	internal; larger radii available on request
Second moment of area	approx. 5.6 cm4	about an axis parallel to a leg
Section modulus	approx. 2.0 cm3	to the outer face of the heel
Weight	approx. 1.01 kg/m	a 6 m bar is about 6.1 kg
Alloy	6063-T5 or 6061-T6	appearance or load
Finish	mill, anodised or brushed	10 to 20 micron anodising
Standard	EN 755-9 / GB/T 6892	wall tolerance +/-0.15 mm
Length	6 m stock	cut to drawing to +/-0.5 mm

The section modulus of about 2.0 cm3 is the number to compare against when you are deciding whether this angle can carry a load. A 40 x 40 mm slotted profile of a similar weight has roughly twice that figure, because a closed box puts its material further from the neutral axis. The angle wins on machinability, not on stiffness.

03Solid angle against slotted profile: the real trade

The comparison that matters is not strength per kilogram. It is what you are allowed to do to the section after you buy it.

A slotted profile gives you a fixing system. You slide nuts in, you bolt things on, you take them off again, and you do it without making a single hole. That is enormously valuable on a machine frame, and it is why every framing range is built around slots.

A solid angle gives you material. You can drill a 10 mm hole at 137 mm from one end because that is where the bracket has to go. You can countersink it, tap it, weld a gusset into the heel, or cut a notch so it passes over a rib. None of those are possible on a hollow section without plugging it first.

And the angle gives you a flat back. Both legs sit flush against the two faces of a corner, which is exactly what a capping or an edge trim has to do. A square hollow section cannot do that: it presents a corner to the corner.

Requirement	Solid 40 x 40 x 5 angle	Slotted 40 x 40 profile
Fix anywhere along the length	yes, drill and tap	only at the slot
Reposition a fixing later	no, the hole stays	yes, slide the nut
Weld into an assembly	yes in 6061-T6	not recommended
Sit flush into a corner	yes, both legs flat	no, presents a corner
Stiffness at equal weight	lower, about 5.6 cm4	higher, roughly double
Take a bolted accessory kit	no	yes, the whole series fits
Visible architectural edge	yes, the intended use	looks industrial
Cost per metre	lower	higher

Read down that table and the decision is usually obvious. If your requirement list is made of the left hand column, buy the angle. If it is made of the right hand column, buy the profile. The only genuinely difficult case is a member that has to be both stiff and fixable, and for that the answer is usually a slotted profile with an angle bolted to it.

04Choosing the alloy: 6063-T5 against 6061-T6

6063-T5, the appearance alloy

The angle is seen: architectural trim, shopfronts, reveals
It will be anodised to a decorative finish
It will be brushed or given a colour matched anodised finish
Loads are light: the trim carries itself and a panel
It will be cut and mitred, not welded
The best surface finish for the money is what matters

6061-T6, the load alloy

The angle carries a real load or spans a gap
It will be welded into a fabricated assembly
It will be drilled and tapped heavily along its length
It works at elevated temperature or outdoors under load
The finish is secondary: paint, or mill left as is
Yield strength is the governing number, not appearance

The practical consequence: if you order 6063-T5 and then weld it, you have annealed the heat affected zone and lost most of the temper. If you order 6061-T6 and then ask for a bright decorative anodise, the surface will show the alloy’s coarser grain and will not match a 6063 trim run. Decide which one matters before you order, not after.

05Failure modes to design out

What goes wrong	Why it happens	Design it out by
Angle springs open at the heel	an extruded angle has residual stress and is not a stiff shape in torsion	clamp both legs during welding, and use a gusset at any loaded corner
Hole elongates under load	a 5 mm leg gives a thin bearing surface for a bolt	add a washer or a backing plate, or move the fixing to a gusset
Anodised faces chip on the cut ends	cut ends are bare aluminium and are the first thing knocked	specify end caps, or order cut lengths with a deburred and anodised end
Galvanic corrosion at the fixing	steel screws into aluminium in a damp location	use stainless fasteners with a nylon washer, or isolate with a gasket
Colour mismatch against an existing run	a top-up order was anodised in a different batch	order the whole job in one anodising run, or accept a written colour tolerance

06What to check before you order

Procurement checklist for the 40 x 40 x 5 mm angle

Confirm the alloy: 6063-T5 for visible trim, 6061-T6 for load or welding. This is the single most common specification error on this section.
Confirm the heel radius. R3.5 is standard; larger radii are a different die and a longer lead time.
Confirm the cut list and the end treatment: square cut, mitred, deburred, or drilled to a hole pattern.
Confirm the finish: mill, clear anodised, champagne, bronze, black, or brushed.
Confirm whether the ends need sealing or capping if the angle is used outdoors.
Confirm the fixing method and that the fasteners are compatible with aluminium if the installation is damp.
Confirm the quantity in metres and allow for mitre waste: a 40 mm leg cut at 45 degrees loses 40 mm per end.

07Terms used on this page

Equal leg angle: An L section whose two legs are the same length. It loads symmetrically and its principal axes run at 45 degrees to the legs.
Heel: The inside corner where the two legs meet. Its radius is set by the die and is the detail the eye reads on visible trim.
Section modulus: Second moment of area divided by the distance to the extreme fibre. It converts directly into the bending moment a section can take.
Gusset: A flat plate welded or bolted across an angle corner to stop the legs springing apart under load.
6063-T5: The standard architectural extrusion alloy. Good surface, moderate strength, not normally welded.
6061-T6: A higher strength, weldable alloy used where the section carries load. Coarser surface, so less suited to bright trim.

08Questions buyers ask

Can the angle be welded?

Yes in 6061-T6, which is the alloy to specify if welding is part of the fabrication. 6063-T5 can be welded but loses temper in the heat affected zone, so it is not specified for welded work.

Can holes be drilled and tapped anywhere?

Yes. Both legs are solid 5 mm material, so a hole can go wherever the drawing puts it. Countersinking for a flush screw head is standard.

How does it compare with a 40 x 40 slotted profile on strength?

The slotted profile is stiffer at a similar weight, roughly double the second moment of area, because a closed box puts material further out. The angle wins on machinability, weldability and its ability to sit flush into a corner.

What is the weight per metre?

Approximately 1.01 kg/m, so a 6 m stock length is about 6.1 kg.

Is it available in colours?

Clear, champagne, bronze and black anodised are standard, and brushed is available on request. Colour matched batches need a longer lead time.

Can it be supplied mitred for corners?

Yes. Mitre cutting on CNC centres is a standard operation and the mitred ends are deburred before packing.

What we need to quote this section

The alloy and temper: 6063-T5 or 6061-T6.
The cut list with lengths, mitre angles and any hole pattern.
The hole details: diameter, countersink, tapping, and positions from a datum.
The finish: mill, clear, champagne, bronze, black anodised or brushed.
Whether the ends need deburring and protection for an outdoor installation.
The quantity in metres or pieces.

Quotations are broken out into extrusion, cutting and mitring, machining, finish and packing, so you can see which step is driving the cost on a trim order. Browse the full aluminium profile catalogue and the angle profiles range for related sections.

Specifying aluminium angle for trim or for load?

Send the alloy, the cut list and the finish. We quote extrusion, mitring, machining and anodising as separate lines.

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