Aluminium Angle Profile Bracket 100 x 100 x 15 mm Heavy Duty Corner

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

100 x 100 x 15 mm heavy duty aluminium angle bracket with round fixing holes for M8 and M10 fasteners. Structural corner gusset for large frames, gantries and heavy equipment bases.

Wholesale Price Quoted per piece against section, hole pattern, finish and quantity per per piece

Material	Aluminium
Alloy Grade	6063-T6
Temper	T6
Section Size	100 x 100 x 15 mm equal leg angle
Slot	Round holes to drawing, M8 and M10 clearance, tapped holes available
Length	Cut to drawing, supplied as finished brackets
Tolerance	EN 755-9 / GB/T 6892, +/-0.3 mm
Surface	Mill finish / clear anodised / black anodised
MOQ	Made to order; small trial batches available from stock offcuts
Lead Time	Typically 2 to 3 weeks for mill finish, about a week longer for anodising
Loading Port	Shanghai, Ningbo, Qingdao
Supply Ability	Extrusion and machining capacity for standard and custom brackets, with in-house anodising
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	Mill certificate to EN 10204 3.1 on request, RoHS and REACH declarations

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01What is the 100 x 100 x 15 mm angle bracket?

What makes this a heavy duty angle bracket?

The 15 mm wall thickness is the key figure. Most aluminium angle brackets in the catalogue range from 3 to 9 mm wall. At 15 mm, this bracket has a section modulus of about 45 cubic centimetres, which puts it in the structural gusset category rather than the trim or edge-protection category. It is designed to sit inside the corner of a large frame — a machine base, a gantry column or a heavy workbench — and transfer bending and shear loads through bolted joints that would otherwise need to be welded.

Why use an aluminium angle bracket instead of welding the corner?

Three reasons. First, disassembly: a bolted angle bracket lets you break the frame down for transport or maintenance. Second, heat distortion: welding a 100 mm aluminium corner pulls the material and changes the frame geometry by a millimetre or more. A bolted bracket keeps the frame square. Third, alloy control: the bracket is 6063-T6, and welding would put the heat-affected zone into a T4 or annealed state, dropping the yield strength. The bracket avoids that loss entirely.

What fasteners does it use?

The bracket has round holes sized to drawing for M8 and M10 bolts. M8 holes are typically 9 mm diameter for clearance; M10 holes are 11 mm. The hole pattern and positions are set by the customer’s drawing, so the bracket can be drilled to match whatever frame profile or plate the customer is using.

02Section data

Item	Value	Note
Leg length	100 mm x 100 mm	equal leg angle
Wall thickness	15 mm	heavy duty, structural grade
Section modulus	approx. 45 cm3	about the strong axis of the leg
Fixing holes	round, to drawing	M8 and M10 clearance
Corner type	internal gusset	sits inside the frame corner
Alloy	6063-T6	EN AW-6063, higher strength than T5
Surface	mill or anodised	anodising 10 to 25 micron
Standard	EN 755-9 / GB/T 6892	dimensional tolerance +/-0.3 mm
Length	cut to drawing	supplied as finished brackets, not stock bars

The section modulus of 45 cubic centimetres is a nominal figure for the 100 x 100 x 15 equal leg section about its strong axis. The actual value depends on the hole positions and whether the bracket is loaded in bending or in shear. For a structural design check, ask for the certified section data on the quotation.

03Where the 100 x 100 x 15 bracket earns its place

This bracket is not a general-purpose angle. It is a structural corner gusset for frames where the joint has to carry real load — bending moments, shear forces, and sometimes torsion. Three applications cover most of what it does:

Machine bases and heavy equipment frames: the bracket sits inside the corner of two 80 or 100 mm frame members, tying them together with M10 bolts. It replaces a welded corner joint and allows the frame to be disassembled for servicing.
Gantry columns and overhead beam supports: the bracket reinforces the joint between a vertical column and a horizontal cross-beam, carrying the bending moment that the beam transfers into the column. The 15 mm wall gives enough section modulus to keep the joint rigid.
Heavy workbench and table frames: on a workbench that carries several hundred kilograms of load, the corner brackets are what stop the frame from racking. Four brackets, one per corner, are standard.

In all three, the bracket is chosen because the joint load is too high for a die-cast corner fitting or a standard T-slot bracket, and welding is not an option or not wanted. The 100 x 100 x 15 is the bolted alternative to a welded structural corner.

04Bolted angle bracket vs welded corner: the cost comparison

The decision between a bolted angle bracket and a welded corner is rarely about raw material cost. It is about what happens after the joint is made. The table below compares the two on the criteria that actually drive the choice on a structural frame.

Criterion	Bolted 100x100x15 bracket	Welded corner	Winner
Joint strength	depends on bolt count and size	full section, as strong as parent material	welded
Disassembly	yes, unbolt and separate	no, cut to dismantle	bolted
Heat distortion	none, frame stays square	1 to 2 mm pull-in typical	bolted
Alloy strength	bracket stays T6	HAZ drops to T4/annealed	bolted
Field repair	swap the bracket	grind out and re-weld	bolted
Cost per corner	bracket + bolts + machining	welder + weld + cleanup	similar
Tolerance	+/-0.3 mm on bracket holes	depends on welder skill	bolted

The pattern is clear: the bolted bracket wins on everything except raw joint strength. On a frame that needs to be transported, serviced or assembled on site, the bolted bracket is the better choice. On a frame that is permanently fixed and never moved, welding may be simpler.

05Section modulus and allowable span for angle bracing

When the 100 x 100 x 15 bracket is used as a diagonal brace rather than a corner gusset, its section modulus determines how much compressive load it can take before buckling. The section modulus of the 15 mm wall equal leg is about 45 cubic centimetres, and the radius of gyration is about 30 mm.

Brace length (mm)	Slenderness ratio	Allowable compressive load (kN)
300	10	approx. 85
500	17	approx. 80
750	25	approx. 70
1000	33	approx. 55
1500	50	approx. 35

The allowable compressive loads are estimates based on 6063-T6 yield strength of 215 MPa and an Euler buckling check with a safety factor of 2.5. They assume the brace is pin-ended at both ends. For a fixed-end condition, the loads are higher. Ask for a structural calculation on the quotation if the brace is load-bearing.

06Choosing between the 100x100x15 and smaller brackets

Choose the 100 x 100 x 15

The frame uses 80 or 100 mm structural members
The joint carries bending moment, not just shear
You need M10 bolts for the joint tension
The frame is large and a smaller bracket looks out of scale
Disassembly or field assembly is a requirement
The frame carries heavy equipment or static load

Choose a smaller bracket (50x50x9 or 30x30x4)

The frame uses 20 to 50 mm T-slot profiles
The joint carries shear only, no significant bending
M5 to M8 bolts are sufficient for the load
The frame is small and a 100 mm bracket would dominate the corner
Weight is a driver (the 100x100x15 is heavy per piece)
The frame is temporary and a die-cast fitting is cheaper

07Failure modes to design out

What goes wrong	Why it happens	Design it out by
Bolt pulls through the hole	the 15 mm wall is thick but the hole is close to the edge	keep the edge distance at least 1.5 times the bolt diameter
Corner racks under lateral load	the bracket resists bending but not racking alone	add a diagonal brace or a second bracket on the opposite corner
Bolt loosens under vibration	aluminium threads are soft and M10 bolts can back out	use spring washers or thread-lock adhesive on all structural bolts
Galvanic corrosion at the bolt interface	steel bolts in aluminium brackets in wet environments	use stainless steel bolts, or isolate with a coating
Bracket does not sit flat on the frame	the extruded surface has a slight bow or die line	specify a machined-flat back face on the drawing for critical joints

08What to check before you order

Procurement checklist for the 100x100x15 bracket

Confirm the hole pattern: hole diameters, positions and edge distances. Supply a drawing if the pattern is non-standard.
Confirm the bolt size: M8 or M10. The hole diameter changes with the bolt — 9 mm for M8, 11 mm for M10 clearance.
Confirm the bracket length: the 100 mm leg is standard, but legs can be cut to 120, 150 or 200 mm if the frame needs a longer gusset.
Confirm the finish: mill for hidden joints, anodised for exposed or corrosive environments.
Confirm the quantity: brackets are sold per piece, not per metre. Count the corners in the frame and add spares.
Confirm the alloy and temper: 6063-T6 is standard. 6061-T6 is available for higher-strength applications.

09Terms used on this page

Section modulus: A geometric property of the cross-section, in cubic centimetres, that determines bending strength. The 100 x 100 x 15 has about 45 cm3.
Gusset: A bracket or plate that sits inside a corner to reinforce the joint against bending and shear.
Slenderness ratio: The ratio of a brace’s length to its radius of gyration. It determines whether the brace fails by yielding or by buckling.
Heat-affected zone: The area around a weld where the heat has changed the material properties. In 6063-T6, the HAZ drops to near-annealed strength.
Edge distance: The distance from the centre of a bolt hole to the edge of the bracket. Minimum 1.5 times the bolt diameter for aluminium.

10Questions buyers ask

Can I get the bracket with tapped holes instead of clearance holes?

Yes. The 15 mm wall is thick enough to tap M8 and M10 threads directly. Specify tapped holes on the drawing if you need the bracket to accept bolts from one side only.

What is the maximum bolt size?

M10 is the standard maximum. M12 is possible but the edge distance gets tight on a 100 mm leg. For M12, specify a 120 mm leg length.

Is it available in 6061-T6?

Yes. 6063-T6 is standard for its extrudability and surface finish. 6061-T6 has a higher yield strength (about 240 MPa vs 215 MPa) and is available for higher-strength structural applications.

How many brackets do I need per frame?

One per corner for a basic box frame. For a frame with racking load, add a diagonal brace or a second bracket on the opposite corner. Four brackets is standard for a workbench; eight for a tall gantry.

Can it be supplied anodised?

Yes. Clear, black and bronze anodising at 15 to 25 micron. Anodising is recommended for brackets in corrosive or outdoor environments.

What is the lead time?

Typically two to three weeks for mill finish brackets cut to drawing. Anodising adds about a week. Custom hole patterns or non-standard leg lengths add one to two weeks for tooling.

What we need to quote this bracket

The bracket drawing or the leg length, wall thickness and hole pattern.
The hole specifications: diameters, positions, tapped or clearance.
The bolt size: M8 or M10.
The finish: mill, clear anodised, or a specified colour.
The quantity in pieces and whether spares are needed.
Any certification requirement: mill certificate to EN 10204 3.1, dimensional report, or structural calculation.

Send those six items and the quotation comes back with the material price, the machining charge, the finish surcharge and the lead time broken out separately. Browse the full aluminium profile catalogue and the angle profiles range for related brackets.

Need this heavy duty bracket quoted for your frame corners?

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

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