CNC Machined Black Anodized Aluminum Bracket Set
Bracket sets machined from 6061-T6 plate, supplied as a matched three-piece kit with hole positions within 0.05 mm, machined bend radii instead of formed corners, 0.4 mm edge breaks and a matt black anodized finish. Each piece is marked 1/2/3 and packed as a set.
- Three Pieces, One Datum
- Hole Positions Within 0.05 mm
- Radiused Outer Profile
- Matt Black Anodized
*Send the assembly drawing rather than the individual parts. The holes only matter relative to each other, and quoting from three separate drawings usually produces a kit that bolts together but does not line up with the frame.
Anodized Bracket Set Overview
A bracket kit is a small assembly pretending to be three parts. Its quality is decided by how the pieces fit each other, not by how each one looks on its own, which is why the set is machined and checked as a group.
The plate is faced, all three profiles are nested and milled from one programme, the holes and threads are cut in the same set-up, then the pieces are anodized in one dye lot so the black matches across the kit.
6061-T6 Aluminium Plate
6061-T6 is used because the brackets are 6 mm plate with milled radii, and it takes a thread in a 6 mm section without pulling out under a normal M5 fixing load.
5052-H32 or 6082-T6
5052 is chosen when the bracket has to be formed after machining, since it will not crack at a tight bend. 6082-T6 is used where the kit is welded into a frame and then re-anodized.
Formed brackets and machined brackets are not interchangeable: a formed corner springs back and the hole moves 0.2 mm, which is why this kit has milled radii.
Anodized Bracket Set Specifications
Milling data for a three-piece kit, with the hole, thread and match values that decide whether it assembles first time.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Bracket Set / Mounting Kit, 3 Pieces | Machining Process | 3-Axis CNC Milling, Profiling, Tapping |
| Material | 6061-T6 Aluminium Plate | Envelope | Up to 180 × 90 × 25 mm per Piece |
| Plate Thickness | 5 – 12 mm | Hole Position | ±0.05 mm From the Datum Face |
| Bend Radius | R8 – R20 Machined, Not Formed | Edge Break | 0.4 mm, All Round |
| Threads | M3 – M8, Class 6H, 1.5 × D Deep | Counterbores | Depth ±0.05 mm |
| Flatness | 0.05 mm on the Mating Faces | Squareness | 0.05 mm per 50 mm |
| Set Match | Pieces Marked 1/2/3, Interchangeable | Weight | 80 – 420 g per Piece |
| Customization | Slot Length, Cable Tie Holes, Logo Engraving, Kit Bag | Lead Time | 4 – 6 Days Sample, 10 – 14 Days Batch |
| Inspection | CMM Hole Pattern, Thread Gauges, Anodizing Thickness | Packing | Kit Bag, Foam Divider, Labelled Box |
Key Features of Our Bracket Sets
Nested from one plate, matched as a set, anodized in a single dye lot.
Machined as a Matched Set
All three pieces come off one programme with a common datum, so the holes line up when the kit is assembled instead of needing a file at the bench.
Milled Radii, Not Formed Corners
The outside radii are cut, not bent, which keeps the profile within 0.05 mm and avoids the spring-back that moves a formed hole off position.
Threads Cut Before Coating
Threads are tapped to a pre-plate size, then masked during anodizing, so an M5 screw runs in by hand without chasing the thread afterwards.
One Dye Lot for the Kit
All three pieces are anodized together, because black anodizing varies visibly between loads and a kit with two shades looks like it came from two suppliers.
Bracket kit that has to assemble first time?
Surface Finishes for Bracket Sets
The finish is mostly cosmetic, but threads and earth points are functional and cannot take the full coating.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Black Anodizing | Matt black that hides handling marks | Clear Anodizing | Keeps the machined aluminium look |
| Bead Blasting | Even matte before dye | Hard Anodizing | Wear surface on a sliding bracket |
| Masked Threads | Threads stay at 6H after coating | Laser Marking | Piece number 1/2/3 and kit code |
| Anodizing Build | 10 – 15 µm, Sealed | Chromate Conversion | Conductive contact for earthing |
| Edge Sealing | Stops dye pooling at the radius | Assembly Grease | None, Dry Fit Only |
| Colour Batch | One Dye Lot per Kit | Scratch Test | Pencil Hardness 4H Minimum |
*Anodizing adds 10 to 15 µm and closes an M5 thread enough to bind a screw. Threads are plugged, and any earth point is masked so the resistance stays under 0.1 ohm.
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Machining Process for Bracket Sets
All three pieces are cut from one plate and one programme, so the set goes together on the machine table before it ever reaches the customer.
01. Assembly Review
Check how the three pieces fit together, confirm the fixing centres and decide the plate thickness from the load the kit carries.
02. Face and Nest the Plate
Face the plate to thickness, then nest all three profiles on one blank so they share a datum and the grain direction.
03. Mill Profiles and Radii
Mill the outside profiles with a 6 mm cutter, leaving the radii as drawn rather than forming them, and check the set against the drawing.
04. Drill, Tap, Counterbore
Drill the fixing holes and counterbores from the same datum, tap the threads and break every edge before the parts leave the machine.
05. Anodize and Kit
Bead blast, anodize black in one load, mask the threads, then mark 1/2/3 and pack the set with a foam divider.
Send the assembly drawing and the fixing centres, and we will quote a matched kit anodized in one lot.
Anodized Bracket Set FAQs
Yes, but the price per piece is higher and the match is not guaranteed, since a single piece may come from a different anodizing load and the black will not be identical.
A formed 6 mm corner springs back by 1 to 2° and moves the hole 0.2 mm, which is enough to stop a kit going together. Milled radii hold 0.05 mm and look sharper.
M3 to M5 through, and M6 with a 1.5 × D depth. Anything deeper needs a thicker plate or a welded boss, because a thread in 6 mm plate has only four full turns.
Standard anodizing is not UV stable and greys within two summers. For outdoor kits we use a sealed anodize plus a clear top coat, or powder coating at 60 to 80 µm.
Yes, laser marking 1/2/3 and the kit code on a face that is hidden in assembly, applied after anodizing so the mark stays legible.
Each set in a labelled bag with a foam divider so the anodized faces do not rub, then boxed. Kits for production lines can be packed in sequence by assembly station.
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