Aluminium Angle Profile Bracket 50 x 50 x 9 mm Medium Duty Corner

OEM / ODM Available Free Sample Available Mill certificate to EN 10204 3.1 on request, RoHS and REACH declarations

50 x 50 x 9 mm medium duty aluminium angle bracket with equal legs and round holes for M6 or M8. Standard corner gusset for 30 and 40 series frames.

Wholesale Price Quoted against drawing, quantity and finish per per piece or per metre

Material	Aluminium
Alloy Grade	6061-T6
Temper	T6
Section Size	50 x 50 mm legs, suits 30 and 40 series
Slot	Round holes to drawing, M6 or M8 typical
Length	Saw cut to length, ends square or 45 degree mitre, +/-0.5 mm
Tolerance	EN 755-9, wall +/-0.2 mm
Surface	Mill finish / clear anodised / black anodised
MOQ	Made to order; small quantities from stock offcuts
Lead Time	Typically 1 to 2 weeks for cutting and drilling, plus a week for anodising
Loading Port	Shanghai, Ningbo, Qingdao
Supply Ability	In-house saw cutting, drilling and CNC machining capacity
Payment Terms	T/T 30 per cent deposit, balance against copy of bill of lading
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 50 x 50 x 9 mm angle bracket?

Why is the 50 x 50 x 9 mm the standard medium duty gusset?

Because it sits at the sweet spot between the light 30 x 30 x 4 mm trim and the heavy 100 x 100 x 15 mm brace. A 50 mm leg gives room for two M8 bolts per leg at proper spacing, and the 9 mm wall gives a section modulus around 12 cm3, enough for the corner moment of a typical 30 or 40 series frame.

Which frames does it suit?

The 30 and 40 series. The 50 mm leg spans across the corner of a 40 x 40 post and picks up the slot fixings on both faces. For the 20 series it is over-sized; for the 45 series and above it is usually under-sized and the 100 x 100 x 15 mm is used instead.

Is it a cast bracket or cut angle?

It is cut lengths of 50 x 50 x 9 mm angle, drilled to your drawing. The advantage over a cast bracket is that the hole pattern is fully customisable and the section is available in any length for use as a short gusset or a longer brace.

02Section data

Item	Value	Note
Leg length	50 mm both legs	equal leg angle
Wall	9 mm	medium duty
Section modulus	approx. 12 cm3	per principal axis
Holes	M6 or M8 to drawing	two per leg typical
Alloy	6061-T6	EN AW-6061
Weight	approx. 2.3 kg/m	from published section
Standard	EN 755-9 / GB/T 6892	wall tolerance +/-0.2 mm
Cut	saw cut, ends square or mitred	to +/-0.5 mm

03Bolt layout and torque

The 50 mm leg takes two bolts per leg at a 30 mm spacing with a 10 mm edge distance. For a 9 mm aluminium wall, the bolt torque is limited by the bearing strength of the aluminium, not the bolt.

Bolt size	Hole diameter	Min edge distance	Max torque
M6	6.5 mm	12 mm	6 Nm
M8	9 mm	16 mm	12 Nm

The torque figures are for a dry, lubricated-free joint. Overtightening an M8 bolt in a 9 mm wall aluminium angle will deform the hole. If you need more clamp force, use a longer bracket or a second bolt rather than more torque.

04Gusset or brace: two ways to use the 50 x 50 x 9

The same section works two ways. As a gusset, it is a short length bolted across a corner. As a brace, it is a longer length cut at 45 degrees on both ends and spanning the corner.

Corner gusset: a 60 to 80 mm length bolted across the inside or outside of the corner, tying the two members together.
Diagonal brace: a length cut to span the corner, usually 300 to 700 mm, carrying axial load to stop racking.
Edge mount: a length bolted along a frame edge to carry a panel or a component.

For a brace, the 50 x 50 x 9 mm is limited to about 1.2 m in length before buckling under compression. For longer braces, step up to the 100 x 100 x 15 mm.

0550 x 50 x 9 vs 100 x 100 x 15: which one?

Choose the 50 x 50 x 9

The frame is 30 or 40 series and of standard size
The corner carries a medium moment, not a gantry load
M6 or M8 bolts are sufficient
Weight and cost per bracket matter
The bracket is a gusset or short brace

Choose the 100 x 100 x 15

The frame is large (over 2 m) or a gantry
The corner carries a heavy moment or a loaded head
M10 bolts are needed for the joint
The brace spans over 1.2 m
The bracket is a primary load path, not a reinforcement

06Failure modes to design out

What goes wrong	Why it happens	Design it out by
Bolt tears out at the hole edge	edge distance is under 2x the hole diameter	keep the edge distance to the table in section 03
Hole deforms from overtightening	torque exceeds the bearing strength of the 9 mm wall	keep M8 torque under 12 Nm, use more bolts instead
Bracket bends under corner moment	the bracket is under-sized for the load	check the section modulus, or use two brackets per corner
Brace buckles under compression	the brace is longer than 1.2 m	shorten the brace or step up to the 100 x 100 x 15 mm
Mismatched anodising	the bracket and frame are from different runs	specify a single anodising run for bracket and frame

07What to check before you order

Procurement checklist for the 50 x 50 x 9 angle

Confirm the leg length and wall: 50 x 50 x 9 mm.
Confirm the hole pattern: bolt size, spacing and edge distance. Send a drawing.
Confirm the end cuts: square for a gusset, 45 degree for a brace.
Confirm the finish: mill or anodised, matched to the frame.
Confirm the quantity and length for gussets or braces.
Confirm the alloy: 6061-T6 is standard; 6063-T5 for welding.

08Terms used on this page

Gusset: A bracket that reinforces a corner joint, spreading the load across a larger area than the corner itself.
Section modulus: A geometric property, in cm3, determining bending strength. The 50 x 50 x 9 mm has about 12 cm3.
Edge distance: The distance from a bolt hole centre to the nearest edge, at least 2x the hole diameter in aluminium.
Bearing strength: The load the aluminium around a bolt hole can carry before it deforms or tears.
Brace: A diagonal member that carries axial load to stop a frame racking.

09Questions buyers ask

Which frame series does the 50 x 50 x 9 mm suit?

The 30 and 40 series. The 50 mm leg spans the corner of a 40 x 40 post and picks up the slot fixings. For the 45 series, use the 100 x 100 x 15 mm.

Can the holes be drilled to my pattern?

Yes. The angle is supplied as cut lengths and drilled to your drawing, with the bolt size, spacing and edge distance you specify.

What bolt torque should I use?

Up to 6 Nm for M6 and 12 Nm for M8 in the 9 mm wall. Overtightening deforms the hole.

What is the weight per metre?

Approximately 2.3 kg/m for the 50 x 50 x 9 mm section.

Can it be anodised?

Yes. Mill or anodised. Specify a single run to match the frame colour.

What is the lead time?

One to two weeks for cutting and drilling, plus a week for anodising.

What we need to quote this bracket

The drawing showing the angle and hole pattern.
The bolt size and the number of holes per leg.
The cut length and quantity.
The end cuts: square or 45 degree mitre.
The finish: mill or anodised.
The alloy: 6061-T6 or 6063-T5.

Send those six items and the quotation comes back with the material, cutting, drilling and finish broken out separately. Browse the full aluminium profile catalogue and the angle profiles range.

Need this medium duty corner quoted against your drawing?

Send the drawing, the hole pattern and the finish. We quote material, cutting, drilling and anodising as separate lines.

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