Anodizing, plating, powder coating, blasting and polishing on machined metal and plastic parts. We pick the process by alloy, tolerance and environment, not by what is easiest to run.
Most finishing failures trace back to a choice made before the part was anodized or plated.
Anodizing bath chemistry drifts, dye lots change, and the second batch comes back two shades off. On visible housings that is scrap, not a rework. We lock the dye lot and record bath parameters so a repeat order matches the first one.
Coating thickness lands on the whole surface, including the threads and bores you already held to ±0.005 mm. A M6 thread can lose its fit after 25 μm of nickel. We mask critical features or adjust pre-plate dimensions so assembly still works.
Bead blasting removes tool marks, but it also breaks edges. On a sealing face or a bearing seat, a rounded edge leaks or loses preload. We control pressure, media size and dwell time, and we mask surfaces that must stay crisp.
Powder coating and paint cover what is underneath. A scratch from deburring or a porosity defect in cast aluminum only shows after the part is in the field. We inspect and document before coating, not after.
The finish is chosen from the drawing, the alloy and the working environment.
Aluminum 6061 and 7075 anodize well. 2024 does not, and it shows blotchy color no matter how the bath runs. If your part sees salt spray, hardcoat anodizing gives a thicker oxide than Type II and holds up longer. For a part that must conduct, we use conductive anodizing or mask the contact pads.
Stainless 303 and 316 usually need passivation or bead blasting, not plating. Carbon steel and 4140 get black oxide or zinc. Magnesium AZ31B and AZ91D need a different pretreatment than aluminum, and we run that separately to avoid cross-contamination.
Electroless nickel adds 10 to 25 μm per side. Type III anodizing can add 25 to 50 μm. On a bore held to ±0.005 mm, that build-up is the whole tolerance. We either machine undersize before coating or mask the feature and leave it bare.
Threads are the common failure point. A plated M8 thread may not accept its mating screw. We call out masked threads on the traveler, and we check them with go/no-go gauges after finishing.
For tight parts, we run a first article through the full finishing route before the batch. It costs one part. It saves the batch.
Use this to narrow the choice before you send the file.
| Finish | Typical thickness | Best for | Watch out for |
|---|---|---|---|
| Type II anodize | 5–25 μm | Aluminum housings, visible covers | Color shift on 2024 alloy |
| Type III hardcoat | 25–50 μm | Wear surfaces, sliding parts | Larger dimensional build-up |
| Electroless nickel | 10–25 μm | Steel and aluminum, tight tolerance | Threads and bores need masking |
| Zinc plating | 5–15 μm | Carbon steel hardware | Hydrogen embrittlement on high-strength steel |
| Powder coating | 50–150 μm | Sheet metal enclosures | Thick build-up, sharp edges round off |
| Bead blasting | Removes 2–10 μm | Matte finish, tool-mark removal | Edge rounding on sealing faces |
| Black oxide | 1–3 μm | Tooling, mild corrosion protection | Thin, needs oil to hold up |
| Polishing | Material removal | Optics, sealing surfaces | Slow on hard alloys |
Six finishing routes, matched to the parts we machine and cast.
Type II with clear, black or dyed color, plus Type III hardcoat for wear. We also run conductive anodizing for parts that need a ground path. Aluminum, magnesium and titanium.
Electroless nickel, zinc, silver and gold. Electroless nickel suits tight parts because it deposits evenly on complex geometry. Silver and gold go on RF and contact surfaces.
A polymer layer from about 50 μm to 150 μm. Strong and wear resistant. Best on sheet metal enclosures and frames where thickness has room in the design.
Uniform matte surface that removes tool marks and sanding lines. Pressure and glass bead size are the two settings that control how much edge break you get.
Progressive grits down to a mirror finish where the drawing needs it. We use it on sealing faces, optical parts and visible consumer surfaces.
Black oxide for tooling and mild corrosion protection. Laser marking and engraving down to 1.5 mm character height for part numbers and traceability codes.
| Item | Detail |
|---|---|
| Part size | Up to 4,000 mm maximum processing size |
| Materials | Aluminum, stainless, steel, copper, brass, titanium, magnesium, plastics |
| Surface finish | Ra 0.2–0.8 μm fine, Ra 0.8–1.6 μm high, Ra 1.6–3.2 μm as machined |
| Tolerance held | ±0.005 mm (±0.0002 in) on critical features |
| Inspection | 100% before shipment, reports on request |
| Order size | One prototype to 10,000+ part runs, no minimum |
| Certifications | ISO 9001:2015, IATF 16949:2016, ISO 13485:2016, ISO 27001:2022 |
| Confidentiality | Secure uploads, NDA available on request |
Founded in 2011. Machining and finishing under one roof since then, so the handoff between the two is a traveler, not a truck.
16 simultaneous 5-axis centers, 12 four-axis mills, 27 three-axis machines and 16 mill-turn centers. Finishing capacity scales with them.
We subtract coating thickness before machining, so the finished part still lands inside ±0.005 mm on critical features.
Raw material check, in-process monitoring and final inspection. Every part is inspected before it ships.
Quotation and free DFM analysis within 12 hours. Production can start within 24 hours of approval.
From one prototype to 10,000+ part runs. Same finishing route on the prototype and the production batch.
Corrosion resistance for under-hood parts, consistent color on visible trim.
Bus bars and housings that need conductive or insulating surfaces, plus thermal paths.
Wear surfaces on slides and guides, hardcoat where parts rub all day.
Cleanable surfaces, passivated stainless, no coating where it can flake.
It depends on the alloy and what the part does. 6061 and 7075 anodize cleanly. 2024 tends to come out blotchy, so we steer that alloy to a different route or accept a looser color spec.
If the part sees wear, use Type III hardcoat. If it must conduct, use conductive anodizing or mask the contact areas and leave them bare.
Yes. Electroless nickel adds roughly 10 to 25 μm per side, and Type III anodizing can add 25 to 50 μm. That is enough to consume a ±0.005 mm tolerance on a bore.
We handle it by machining undersize before coating, or by masking the feature so it stays bare. Tell us which dimensions are critical and we plan the route around them.
Yes. Threads, bores and sealing faces can be masked so they stay at the machined dimension. We mark masked features on the traveler and check them with go/no-go gauges after the coating cures.
If masking is not practical for the geometry, we subtract the coating thickness from the pre-plate dimension instead.
Anodizing color depends on bath chemistry, dye lot and dwell time. We lock the dye lot for a repeat order and record the bath parameters.
For visible parts, we keep a reference coupon from the first approved run and compare against it before the batch is released.
Our standard bands are Ra 1.6–3.2 μm as machined, Ra 0.8–1.6 μm for a high finish, and Ra 0.2–0.8 μm for a fine finish.
Polishing and bead blasting change the reading, so tell us whether the roughness callout applies before or after finishing.
No. We run from a single prototype to 10,000+ part runs. A one-off prototype goes through the same finishing route as the production batch.
That matters because a prototype finish that cannot be repeated in production is not much use.
Quotation and free DFM analysis come back within 12 hours. Production can start within 24 hours of approval.
Typical ship time is 3 to 5 days. Our historical late-delivery probability is below 2%.
Uploads are secure and confidential. We can sign an NDA on request before you send drawings.
Our quality system is certified to ISO 27001:2022 for information security.
Tell us the alloy, the environment and the dimensions that must not move. We will come back with the route, the thickness and the tolerance plan.
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CNC Metals 13 grades
CNC Plastics 10 grades
Machines & processes 12 options
Surface & post-processing 10 options
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