Surface finishing transforms a machined, stamped, or fabricated metal part into a finished product — but it requires specialized equipment, chemical handling permits, and environmental compliance that few manufacturers maintain in-house.

At Conwhole, we take a different approach: instead of operating our own plating and anodizing lines, we manage a **qualified partner network** of finishing specialists. Each partner is audited, approved, and continuously monitored by our quality team. The result? You get the same one-stop convenience — one purchase order, one shipment, one point of contact — with the process expertise of dedicated finishing facilities.

Key Takeaways:
– Managed network of audited finishing partners
– Anodizing, plating, powder coating, polishing, brushing, and more
– Color matching and sample approval process before production
– Batch traceability and incoming quality inspection at Conwhole
– One purchase order covers manufacturing + finishing + inspection
– ISO 9001 quality management across the supply chain

Electronics & Thermal Management

– Anodized aluminum heat sinks and enclosure housings (insulation + thermal performance)

– Chemical film on chassis components for corrosion resistance & conductivity

– Silkscreen printing for control panel graphics and connector labeling

– Black anodize with laser engraving for branding and serialization

Food & Commercial Kitchen Equipment

– Electropolished stainless steel for sanitary surfaces (Ra ≤ 0.2 µm, no bacterial adhesion)

– Passivated 304/316 stainless steel components per ASTM A967

– Nickel-plated steel frames and brackets (food-safe, corrosion-resistant)

– Mirror-polished stainless steel for visible surfaces

Architectural & Interior Hardware

– Satin-brushed and mirror-polished stainless steel handrail fittings and connectors

– Anodized aluminum in custom architectural colors for facade brackets and trim

– Powder-coated steel in RAL-matched colors for structural support hardware

– PVD-coated brass and stainless steel for premium decorative finishes

Automotive & Industrial Equipment

– Zinc-plated steel fasteners and brackets (Cr3+ trivalent passivation, RoHS compliant)

– Hard chrome plating on hydraulic cylinder rods and shafts for wear resistance

– Black oxide on steel components for mild corrosion protection with no dimensional change

– Powder coating on machine frames, guards, and enclosures (impact and chemical resistant)

Medical & Laboratory Devices

– Electropolished 316L stainless steel for surgical instruments and implant trials

– Passivation (nitric acid) for corrosion-resistant stainless steel components

– Clear anodizing on aluminum instrument housings and mounting brackets

– Bead-blasted matte finish for non-reflective surfaces in operating room environments

Every finishing partner undergoes Conwhole’s qualification audit covering process capability, environmental permits, quality management system, and delivery reliability. You benefit from specialized finishing expertise without managing the supplier relationship yourself.

We produce finish approval samples (A-sample) for your sign-off before running the full batch. Color swatches, gloss levels, texture references — approved visually and documented. No surprises when your production order arrives.

We check color consistency, coating thickness, adhesion (cross-hatch test), salt spray resistance (when specified), and dimensional conformance. Non-conforming batches are rejected before they leave our facility.

You order machined + finished parts from Conwhole. We handle the manufacturing, finishing, quality inspection, and logistics coordination. One order, one shipment, one contact — whether your parts need anodizing, plating, powder coating, or a combination of finishes.

Q1: Do you do surface finishing in-house?
We manage surface finishing through an audited partner network rather than operating our own tank lines. This approach gives you access to specialized finishing expertise (each partner focuses on specific processes) while Conwhole handles quality control, coordination, and delivery. All parts pass through Conwhole’s incoming inspection before shipping to you.

Q2: How do you ensure color consistency between batches?
We produce finish approval samples (A-samples) for your sign-off before production. The approved sample becomes the reference standard for the entire batch and future repeat orders. Incoming inspection at Conwhole checks every batch against the A-sample under D65 standard lighting. For critical color-matching applications, we use a spectrophotometer to measure CIELAB color values.

Q3: What quality tests do you perform on finished parts?
Standard incoming inspection includes visual inspection (color, gloss, texture consistency), coating thickness measurement (eddy current for anodizing, magnetic for plating), and cross-hatch adhesion testing per ISO 2409. Additional tests available on request: salt spray corrosion testing (ISO 9227), pencil hardness (ISO 15184), impact resistance (ISO 6272), and chemical resistance testing.

Q4: Can you match a specific color — RAL, Pantone, or a custom sample?
Yes. For powder coating, we match RAL, Pantone, and custom colors. For anodizing, we match to standard color ranges (clear, black, blue, red, gold) or custom dye colors. If you provide a physical color sample, we produce A-samples for your approval before production. Note: anodizing color matching has wider tolerance than powder coating due to the electrochemical nature of the process.

Q5: What is the minimum order quantity for finishing?
There is no strict minimum — finishing cost is typically calculated per part or per batch. Small prototype quantities (1-10 pieces) are feasible, though unit cost decreases significantly at production volumes. We’ll quote based on your specific quantity and provide volume break pricing when applicable.

Q6: How long does surface finishing add to lead time?
Typical finishing lead time is 3-7 business days after manufacturing is complete, depending on the process and current partner capacity. For rush orders, we can expedite to 1-3 days. We factor finishing lead time into your overall delivery schedule at quotation stage.

Q7: Can you handle parts that need multiple finishing processes?
Yes. Parts requiring a combination of finishes — for example, bead blasting followed by anodizing, or zinc plating with a chromate conversion coating — are managed through sequential processing at the appropriate partners. Our project coordinator tracks the part through each finishing step and performs intermediate inspections as needed.

Q8: What finishing specifications and standards can you work to?
We work to common industry standards including MIL-DTL-5541 (chemical film), ASTM A967 (passivation), ISO 2409 (adhesion), ISO 9227 (salt spray), and RoHS/REACH compliance for restricted substances. If your drawing references a specific standard or corporate finishing specification, include it with your RFQ and we’ll confirm capability during review.

Send us your drawings with finishing specifications —

we’ll handle manufacturing, surface treatment, inspection, and delivery as one complete package.