Consumer Electronics Housings at 0.3 mm Wall, With a Finish That Survives Retail
In consumer electronics the housing is the product. A 0.05 mm gap at the lid reads as poor build quality, a colour shift across a lot reads as a defect, and a 0.3 mm wall that deflects under a thumb reads as cheap. All three are decided by the process route.
- Minimum wall
- 0.3 mm
- Machined fits
- ±0.01 mm
- Finish
- 180# bead blast
- Tooling
- 4–5 days
Three ways a 3C housing fails
Every rejection we see in this industry traces back to one of these three, and none of them is fixed by tighter inspection at the end.
Wall deflection at 0.3 mm
A thin wall clamps down under fixture pressure and springs back after machining. If the fixture copies the part instead of supporting it, the wall moves and the fit opens.
0.3 mm minimum wallAppearance consistency across lots
Bead blast texture and anodized colour both drift with alloy, section and bath. A lot that passes dimensionally can still be rejected on a colour card.
Chip approved before productionLid and port fits in one assembly
The lid step, the connector cut-out and the hinge pocket are machined in different setups. Without a shared datum, the gaps add up.
±0.01 mm from one datumHow we hold those three
The route is the same for every housing we quote. What changes is which stage gets the attention.
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Die design that carries the wall
The section is designed so the die forms the wall, the internal rails and any fins in one pass. The 0.3 mm wall exists before machining starts, so machining only has to preserve it.
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Staged machining with stress relief
Roughing, stress relief, then finishing, in a fixture cut from the production profile. Light, even clamping means the wall is measured in the state the customer receives it.
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Physical colour approval, every time
180# bead blast without polishing gives a uniform matte with no buffing marks. You approve a chip in the production alloy and that chip is retained for every lot.
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One supplier for body and caps
The extruded body and the machined end caps are made, finished and inspected in the same facility, so a colour or fit question has one owner.
Parts we make for 3C programmes
Part families we quote for this industry. Client names are withheld; the process facts are ours.
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Ultra-thin housing 0.3 mm wallUltra-thin housing
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Charging case Hinge and lid fitCharging case
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Mid-frame Machined pocketsMid-frame
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Camera housing Anodized matteCamera housing
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Power bank shell Extruded bodyPower bank shell
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Stylus barrel Round profileStylus barrel
Programs in this industry
Three cases that show how appearance and thin walls were held in production.
0.3 mm Thin-Wall Housing
One-piece extrusion plus CNC, bead-blasted anodized, for a 3C accessory program.
Wall 0.3 mm
Read the case studyTWS Charging Case
A two-part housing where hinge fit and lid gap had to close the same way every time.
Hinge fit
Read the case studyExtruded Speaker Enclosure
Wall thickness consistency that steadied acoustic resonance across the run.
Wall uniformity
Read the case studySpec highlights — Consumer Electronics
- 0.3 mm minimum wall, ±0.02 mm wall thickness capability
- Machined fits to ±0.01 mm from one datum
- 180# bead blast anodizing without polishing
- Colour approved on a physical chip before production
- Profile section ±0.05 mm, alloy 6063-T5 / T6
- Die in 4–5 days, first sample about 7 days
Where the route runs out
- Walls below 0.3 mm — the extrusion will not fill consistently
- Deep 3D cosmetic geometry that cannot be released from a die
- Multi-material assemblies needing plastic overmoulding
- Screens, optics and electronics integration — we make the housing, not the device
For deep 3D shells we usually propose a machined-from-billet prototype first, then a hybrid route where the extruded section carries the wall and machining cuts the geometry. That decision is made at DFM, before tooling.
3C housing questions
The questions product and sourcing teams ask before a housing programme starts.
Can you match the anodized colour of our previous supplier?
Send a physical sample from the old part and the alloy it was made in. We anodize a chip in the same alloy and blast and send it back for approval; that chip becomes the reference for every lot.
How do you avoid the lid gap opening up in a thin-wall housing?
The lid step and the body face are machined from the same datum in one setup where possible. Where the geometry needs two setups, we hold the part in a fixture cut from the production profile so the second setup repeats the first.
What volume justifies the die?
Typically 2,000 pcs/year for small housings and 500 pcs/year for large ones. Below that we quote a machined route and revisit the die once the programme firms up.
Send the Housing Drawing. We Will Mark Up the Wall and the Fits.
Include the wall thickness, the lid or hinge fit that matters and the annual quantity. You get a DFM note on what a die can carry before tooling is cut.
What to send
- 2D drawing or 3D model (STEP, IGES, DWG, DXF, PDF)
- Alloy and temper
- Surface finish and color
- Estimated annual quantity