Surface Finishing Support for CNC Machined and Sheet Metal Parts
OUJI helps overseas buyers coordinate machining, anodizing, plating,
passivation, bead blasting, polishing, powder coating, masking review,
coating thickness checks, and post-finish inspection in one practical
project workflow.
Masking and critical dimension check
Inspection and packaging support
We review material, coating thickness, masking areas, threads, cosmetic surfaces, and critical post-finish dimensions.
Initial quote response for clear drawings
Fast delivery option for simple CNC parts
Typical planning target for multi-process projects
Visual, dimensional, coating and packaging review
Surface Finishing Is Not Only About Appearance
A surface finish can affect corrosion resistance, conductivity, wear
resistance, color appearance, thread fit, assembly clearance, and final
product quality. For overseas buyers, the risk is often not the finishing
process itself — the risk is poor review before the parts are sent out
for finishing.
OUJI reviews the drawing notes, base material, critical dimensions,
cosmetic surfaces, masking areas, and inspection requirements before
arranging finishing, so the machining and finishing route can be planned
together.
Common Surface Finishing Options We Coordinate
We support practical finishing options for prototype, small-batch, and
custom production parts. Final availability depends on material, part
geometry, cosmetic requirements, tolerance needs, and drawing notes.
Anodizing
Common for aluminum housings, brackets, panels, covers, and CNC parts
requiring corrosion resistance, color, or improved surface hardness.
- Clear, black, selected custom colors
- Type II / selected hard anodizing review
- Color, masking and thread-fit review
Electroplating
Used for steel, brass, copper, aluminum, RF, electronics, connector,
and functional components requiring protection or conductivity.
- Nickel, zinc, copper, tin, silver, gold
- Conductive and anti-corrosion applications
- Thickness and contact surface review
Passivation
Suitable for stainless steel parts requiring improved corrosion
resistance while maintaining a clean metal surface.
- Stainless steel machined parts
- Medical, industrial and clean hardware
- Surface cleanliness and stain review
Bead Blasting
Creates a matte, uniform texture and can be combined with anodizing
or other finishes for cosmetic aluminum parts.
- Matte cosmetic appearance
- Aluminum housings and covers
- Texture direction and surface uniformity
Polishing
Used for parts requiring smoother surfaces, decorative appearance,
reduced machining marks, or functional contact surfaces.
- Stainless steel, aluminum, brass
- Cosmetic and functional surfaces
- Flatness and edge condition review
Powder Coating
Common for sheet metal enclosures, brackets, panels, and structural
parts requiring durable color coating.
- Sheet metal and fabricated parts
- Durable color finish
- Coating build-up and masking review
Black Oxide
Suitable for selected steel components requiring black appearance,
light corrosion resistance, or reduced reflection.
- Steel components
- Black appearance
- Oil protection and storage review
Conversion Coating
Used for aluminum parts requiring corrosion resistance, electrical
conductivity, or a suitable base for later coating.
- Aluminum parts
- Conductive surface applications
- Drawing specification review
We Review the Details That Often Cause Finishing Problems
Many finishing issues happen because the part was machined correctly,
but the coating thickness, masking zones, cosmetic faces, or post-finish
dimensions were not reviewed early enough.
Aluminum, stainless steel, steel, brass, copper, and selected plastics.
Anodizing, plating, passivation, coating, polishing, blasting, or black oxide.
Holes, threads, slots, bearing areas, sealing faces, and assembly features.
Grounding surfaces, datum faces, non-coated zones, threads, and contact areas.
Visible faces, color, texture, scratches, stains, gloss, and direction marks.
Coating thickness, visual check, dimensional check, and report support.
Post-Finish Inspection and Documentation Support
For finished parts, OUJI can support visual inspection, coating coverage
review, selected coating thickness checks, critical dimension checks,
packaging protection, and documentation based on customer requirements.
Coating Thickness Check
Selected plated, anodized, or coated parts can be checked for coating
thickness when required by the drawing or customer specification.
Critical Dimension Review
Threads, holes, slots, sealing faces, bearing areas, and fit surfaces
can be reviewed after finishing to reduce assembly risk.
Cosmetic Surface Review
Visible surfaces, color consistency, scratches, stains, dents, and
texture direction can be checked before shipment.
Protective Packaging
Finished parts can be packed with surface protection to reduce
scratches, rubbing marks, and coating damage during transport.
Surface Finishing for Functional and Cosmetic Custom Parts
We focus on finishing support for drawing-based custom parts where
appearance, corrosion resistance, conductivity, fit, and packaging all
matter to the final project result.
Aluminum Housings and Covers
Anodized, bead blasted, polished, or conversion-coated aluminum parts
for electronics, devices, automation equipment, and enclosures.
RF and Conductive Components
Plating review for copper, brass, aluminum, and selected conductive
components requiring controlled contact areas and coating thickness.
Stainless Steel Parts
Passivation, polishing, brushing, or cleaning support for corrosion
resistance, appearance, and functional surfaces.
Sheet Metal Enclosures
Powder coating, plating, brushing, and finishing support for brackets,
panels, covers, frames, and enclosure components.
How We Coordinate Machining and Surface Finishing
We review the finishing requirement together with machining, not as an
afterthought. This helps reduce rework, cosmetic rejection, fit issues,
and shipment delays.
Drawing Review
We check material, finish notes, coating thickness, tolerances,
cosmetic requirements, masking areas, and inspection needs.
Machining Route
We review whether the part should be machined before or after certain
finishing steps and whether allowance is needed.
Finishing Coordination
We coordinate anodizing, plating, passivation, blasting, polishing,
coating, or other required secondary processes.
Final Check and Packing
We review visible surfaces, coating coverage, selected dimensions,
documentation needs, and protective packaging before shipment.
Surface Finishing Questions from Overseas Buyers
Can OUJI provide machining and surface finishing together?
Yes. We can coordinate CNC machining, sheet metal fabrication, and
secondary processes such as anodizing, plating, passivation, bead
blasting, polishing, powder coating, and selected inspection support.
Can you check coating thickness?
For selected plated, anodized, or coated parts, coating thickness
checks can be arranged based on drawing notes, customer requirements,
and project feasibility.
Do finishing processes affect tolerances?
Yes. Anodizing, plating, coating, and other finishes may add material
thickness or affect surface conditions. We review threads, holes,
fits, datum surfaces, and critical dimensions before quoting.
Can you mask threads or contact surfaces?
Yes. Threads, contact surfaces, grounding areas, sealing faces, datum
surfaces, and other non-coated zones can be reviewed for masking when
the drawing or application requires it.
Can you support cosmetic parts?
Yes. For cosmetic parts, please provide color, texture, visible surface,
scratch tolerance, packaging, and acceptance requirements. We will
review these details before production.
What should I send for a surface finishing quote?
Please send 2D drawings, 3D files, material, quantity, finish type,
color or coating requirement, masking notes, critical dimensions, and
target lead time.
Send Your Drawings for Machining and Finishing Review
Send your drawings, material, quantity, finish type, color or coating
requirement, masking areas, and critical post-finish dimensions. OUJI
will review the machining and finishing route together before quoting.
- STEP / IGES / PDF drawings
- Material and finish requirement
- Color, texture, or coating thickness notes
- Masking areas and critical dimensions
- Quantity and target lead time