CNC Machined Anodized Aluminum Mounting Bracket
6061-T6 aluminium mounting brackets machined from plate with a flat mounting face, milled slots, tapped holes positioned to ±0.05 mm and a square corner between the two legs. Anodized on all faces in black, clear, red or blue, with threads masked so nothing needs re-tapping at assembly.
- Mounting Face Flat 0.05 mm
- Slots Milled Without Burrs
- Colour Matched Batch
- Holes Deburred
*Send the two faces the bracket has to keep square, not just its outline. A bracket that is machined as a flat plate and then bent loses that squareness in the bend, which is why the corners here are cut from solid.
Aluminum Mounting Bracket Overview
A bracket is a spacing part: it holds one component at a distance and an angle from another. Its outline is usually drawn by the space available, but the features that matter are the two mounting faces and the holes that bolt to them.
The bracket is milled from plate with both legs in one set-up, so the inside corner is a machined radius rather than a bend. Slots and holes are cut after the faces, and the part is deburred before anodizing because a burr under a coating grows into a lump that stops the bracket sitting flat.
6061-T6 Aluminium Plate
6061-T6 is chosen because a bracket needs stiffness more than strength, and the alloy anodizes to an even colour on a part with several faces. It also machines without the gumming that softer alloys give on slotting.
5052 for Formed Brackets or 7075 for Load
5052 is used when the bracket is formed rather than machined, because it bends without cracking. 7075 is specified when the bracket carries a load and the section cannot be thickened.
If the design can be folded, 5052 is cheaper; if the squareness has to be held after coating, a machined 6061 corner is the reliable route.
Mounting Bracket Specifications
Milling data for machined brackets, with face, hole and slot values that decide whether the bracket sits flat and lines up.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Mounting Bracket / Angle Bracket | Machining Process | 3-Axis CNC Milling, Slotting, Tapping |
| Material | 6061-T6 Aluminium Plate | Plate Thickness | 4 – 20 mm |
| Bracket Size | Up to 400 × 250 × 150 mm | Mounting Face Flatness | 0.05 mm |
| Hole Position | ±0.05 mm | Slot Width | 6 – 20 mm, ±0.05 mm |
| Squareness | 0.05 mm per 100 mm | Threads | M4 – M10 |
| Anodizing | Type II 15 – 25 µm, All Faces | Colour | Black, Clear, Red, Blue, Custom |
| Customization | Bend Relief, Gusset, Cable Cut-out, Engraved Label | Lead Time | 5 – 7 Days Sample, 12 – 15 Days Batch |
| Inspection | CMM Hole Pattern, Granite Flatness, Colour Coupon | Packing | Foam Interleaved, Carton, Corner Protected |
Key Features of Our Machined Brackets
Machined corners, deburred before coating.
Square Corner Cut From Solid
The inside corner is machined rather than bent, so the two legs stay square to 0.05 mm per 100 mm and the bracket does not spring back after anodizing.
Slots Milled in One Pass
Slots are cut with a single climb-milling pass at full depth, which leaves clean walls and no burr that would hold the bracket off its mounting face.
Holes Positioned From the Face
Holes are drilled from the machined mounting face rather than the plate edge, so the pattern stays within 0.05 mm and bolts start by hand.
Colour Matched Across the Batch
Coupons from each anodizing load are kept against the batch, so a second delivery matches the first instead of arriving two shades lighter.
Bracket that has to stay square after coating?
Surface Finishes for Mounting Brackets
Colour and corrosion protection are the visible requirements; the threads and the mounting face are the functional ones.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Type II Anodizing | Uniform colour over the whole bracket | Hard Anodizing | Wear resistance at a sliding contact |
| Masked Threads | Keeps tapped holes at gauge after coating | Bead Blasting | Matte surface that hides machining marks |
| Laser Marking | Machine number and orientation on the bracket | Clear Chromate | Conductive finish for an earthed bracket |
*Anodizing adds 7 to 12 µm per surface and grows into a thread. Tapped holes are plugged and re-gauged, and the mounting face is checked for flatness after coating, not before.
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Machining Process for Brackets
The bracket is machined from solid rather than folded, so the mounting face stays flat and the holes stay where the drawing puts them after anodizing.
01. Interface Review
Check both mounting faces, the hole pattern on each leg and the clearance around the corner, and confirm which face is the datum.
02. Machine the Outline
Cut the outside profile and the inside corner from plate, leaving the part attached by tabs so it can be flipped without losing position.
03. Face and Mill Slots
Face the mounting faces, mill the slots at full depth in one pass and cut the bend relief where a cable or a weld has to pass.
04. Drill and Tap
Drill the hole patterns from the machined faces, tap the threads and deburr every edge, including the slot ends where a burr is easy to miss.
05. Anodize and Check
Plug the threads, anodize to colour, pull the plugs, gauge the threads and check the mounting face flatness before interleaving and packing.
Send the bracket drawing with the two faces that must stay square, and we will quote it machined from solid so the corner survives coating.
Mounting Bracket FAQs
Because a bend carries spring-back and a radius that varies with the material batch. A machined corner holds squareness to 0.05 mm per 100 mm and does not move when it is anodized.
0.05 mm on a bracket up to 300 mm, checked after anodizing. Coating stress can bow a thin bracket, so thin parts are machined with a slight crown to compensate.
Yes, the holes are plugged during anodizing and re-gauged afterwards. An unplugged M6 hole closes by about 20 µm and a screw will bind halfway in.
Yes, any RAL or Pantone reference that the anodizer can match, with a coupon approved before the batch runs.
400 × 250 × 150 mm from plate. Larger brackets are made in two pieces and dowelled, which keeps the faces flat but adds a joint.
Yes. A slot cut at full depth leaves a burr on the exit side, and a machine brush rounds the entry but not the exit, which is the edge that holds the bracket off its face.
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