Aluminum CNC housings and brackets often finish with anodizing for corrosion resistance, wear and brand color. OEM buyers should specify alloy, anodize type, cosmetic faces and masking in the RFQ so China factories quote the correct process chain.
Aluminum CNC housings and brackets often finish with anodizing for corrosion resistance, wear and brand color. OEM buyers should specify alloy, anodize type, cosmetic faces and masking in the RFQ so China factories quote the correct process chain.
Alloy selection basics
- 6061-T6: general structural, good anodize response, widely stocked.
- 7075-T6: higher strength; anodize color may differ from 6061.
- 5052: sheet-like applications; machining differs from plate billets.
Call temper and any welding (weld zones anodize differently). Avoid mixing alloys in one cosmetic assembly if color match is critical.
Anodizing callouts that belong on drawings
| Callout | Example | Impact |
|---|---|---|
| Type | Type II sulfuric | Process & thickness range |
| Color | Black / clear / custom dye | Batch match, dye lots |
| Masking | Threads, conductive pads | Labor & fixtures |
| Rack marks | Allowed faces listed | Fixture design |
| Sealing | Standard seal | Corrosion performance |
Machining notes that affect finish quality
Uniform wall thickness and consistent tool marks help cosmetic anodize. Deep pockets may show flow lines. Specify Ra on visible faces before anodize. Deburr edges that would otherwise show white lines after dye.
Inspection tips
- Measure critical dimensions after anodize if coating thickness matters to fits.
- Approve color with physical limit samples under agreed lighting.
- Check conductive ground points remain uncoated if required.
Sourcing from HC-Mold
CNC aluminum parts with finishing coordination are available from HC-Mold International Co., Limited in Dongguan under ISO 9001:2015. Free DFM; reply ≤12h; quote ≤24h on complete packages. Prototype MOQ often 1 piece.
Cosmetic standards and batch consistency
Anodize color varies with alloy, dye lot, racking and seal chemistry. For multi-shipment OEM programs, approve master samples and retain them at both buyer and factory. Specify whether slight shade differences between 6061 and 7075 components in one assembly are acceptable.
Threading after anodize versus masking threads changes both cost and fit class. Conductive grounding pads usually need mask or secondary mill. Laser mark before or after anodize depending on contrast requirements—state the sequence in the process router.
Salt spray or wear tests belong in the RFQ if the product environment is harsh. Not every decorative Type II finish is intended for marine or abrasion duty; hardcoat may be the correct engineering path even if cosmetics are secondary.
Buyer checklist before you issue the PO
Confirm drawings are revision-controlled, materials are purchasable in China within your schedule, and inspection methods are agreed in writing. Ambiguity at PO stage becomes cost later. List secondary operations, packaging and labeling so they are not treated as free extras. If multiple factories are bidding, freeze the same specification package for all—do not let informal calls create hidden scope differences.
Align internal stakeholders: industrial design owns cosmetics, engineering owns function, procurement owns total cost and risk. A single RFQ owner should consolidate feedback so the manufacturer receives one voice. For export programs, involve logistics early on Incoterms preference and whether tools or finished goods will cross borders.
CNC aluminum anodizing OEM decisions improve when data is complete. HC-Mold International Co., Limited in Chang'an, Dongguan, Guangdong, China operates under ISO 9001:2015 with free DFM on complete packages, reply within 12 hours, and quote within 24 hours when files, material, volume and finish are clear. Email contact@hc-mold.cn or call +86-769-85327002. Prototype CNC frequently supports MOQ of one piece when geometry is defined.
Documentation to keep in your program folder
- Final quote with assumptions listed line by line.
- NDA and tooling ownership clauses if molds are involved.
- Approved DFM screenshots and CAD revision that matches the PO.
- Sample reports (dimensional and visual) with clear accept/reject notes.
- Packaging photos and carton specs for repeat orders.
FAQ
Does anodizing change dimensions?
Yes, coating thickness consumes some dimensional budget. Design fits accordingly or machine post-mask strategies.
Can you match Pantone exactly?
Anodize dyes approximate brand colors; approve with samples rather than assuming perfect Pantone match.
Hard anodize vs decorative?
Hard anodize (Type III class) is thicker/wear-focused; decorative Type II is common for enclosures.
How do I RFQ?
Send STEP + 2D with alloy, anodize type/color, masking and qty to contact@hc-mold.cn.
Ready to source CNC aluminum with anodizing? Send your STEP/IGES drawings, material notes, volume band and finish requirements via our RFQ form. HC-Mold International Co., Limited is a direct OEM manufacturer in Chang'an, Dongguan, Guangdong, China (ISO 9001:2015). Contact: contact@hc-mold.cn · +86-769-85327002. Free DFM review; reply ≤12h and quote ≤24h on complete RFQ packages.
Talk to HC-Mold engineering
Free DFM · reply ≤12h · quote ≤24h on complete RFQ · ISO 9001:2015 · Dongguan, China