CNC Surface Finish Guide
CNC Surface Finish Guide for Custom Machined Parts
Compare common CNC surface finishing options by material fit, visual result, dimensional impact, roughness target, Inspektionsmethode, and RFQ information needed before production planning.
Finish selection before quotation
What This Guide Helps You Decide
Surface finish affects how a CNC machined part looks, fits, resists corrosion, handles wear, conducts electricity, insulates, seals, and passes inspection. JADE-CNC reviews finish requirements together with material, Geometrie, Bearbeitungsspuren, Maskierungsbereiche, Toleranzeinfluss, and cosmetic surfaces.
This guide is a practical reference for RFQ preparation. Actual finish capability is confirmed according to drawing requirements, Materialqualität, Teilegeometrie, coating process, Inspektionsumfang, and project quantity.
RFQ review note
For faster review, include finish name, Farbe, visible faces, Maskierungsbereiche, roughness target, Schichtdicke ggf. anpassen, Inspektionsmethode, and any functional surfaces that must remain controlled after finishing.
Surface function
Start With the Function of the Surface
Define matte, glossy, brushed, polished, black, natural, or color-matched surfaces and identify visible cosmetic faces.
Confirm whether the part faces humidity, salt, outdoor exposure, chemicals, or cleaning fluids.
Mark sliding surfaces, Paarungsgesichter, threaded areas, and features where coating buildup may affect fit.
Clarify conductive, insulating, grounding, or masking requirements before anodizing, Beschichtung, or plating.
Review coating thickness, Maskierung, edge condition, hole fit, and tolerance zones before final finish approval.
Specify whether roughness check, coating thickness record, visual approval, or dimensional report is required.
Common finishing options
Surface Finishing Options JADE-CNC Commonly Reviews
| Finish Option | Typische Verwendung | Materials Often Reviewed | Key RFQ Details |
|---|---|---|---|
| Eloxieren | Color, Korrosionsbeständigkeit, and improved surface durability for aluminum parts. | Aluminium 6061, 7075, 2024, 6082 | Color, Type II or hardcoat, Maskierungsbereiche, visible faces, thickness if controlled. |
| Perlenstrahlen | Uniform matte appearance and reduced machining marks before anodizing or cosmetic review. | Aluminium, Edelstahl, Messing | Cosmetic faces, protected dimensions, acceptable surface texture, before/after finish condition. |
| Black Oxide | Dark surface appearance and mild corrosion protection for steel components. | Carbon steel, legierter Stahl, Werkzeugstahl | Required appearance, post-treatment oiling, threaded areas, Passflächen. |
| Passivierung | Cleaning and corrosion-resistance support for stainless steel machined parts. | Edelstahl 304, 316, 17-4PH | Materialqualität, standard if specified, cleanliness needs, documentation requirement. |
| Polieren / Brushing | Directional or reflective appearance for visible metal surfaces. | Edelstahl, Aluminium, Messing | Grain direction, visible side, roughness target, edge protection, sample approval if needed. |
| Malerei / Pulverbeschichtung | Color, Aussehen, Isolierung, and protective coating for housings or panels. | Aluminium, Stahl, selected assemblies | Color code, coating thickness, Maskierung, Gewindelöcher, adhesion or cosmetic requirement. |
Dimensional and inspection planning
How JADE-CNC Reviews Finish Impact
Drawing Review
Check finish symbols, notes, kritische Dimensionen, GD&T, visible faces, Threads, Löcher, und Passflächen.
Material Match
Confirm whether the requested finish is suitable for aluminum, Edelstahl, Kupfer, Messing, Stahl, or engineering plastic.
Masking Plan
Identify areas that must stay conductive, uncoated, threaded, dimensionally controlled, or cosmetically protected.
Inspection Scope
Plan visual checks, roughness review, coating thickness record, CMM report, or finish approval reference when required.
RFQ checklist
Information to Share With Your Drawings
Eloxieren, Hardcoat-Anodisierung, schwarzes Oxid, Passivierung, Polieren, Perlenstrahlen, Malerei, Überzug, or powder coating.
Natural, black, clear, matte, gloss, brushed direction, cosmetic faces, and sample approval expectation.
Threads, Löcher, bores, sealing faces, electrical contact zones, Paarungsgesichter, and surfaces that need masking.
Beschichtungsdicke, Ra target, pre-finish dimensions, after-finish dimensions, and acceptance tolerance.
Visual inspection, dimensional report, CMM report, coating check, roughness check, CoC, or customer format.
Outdoor exposure, salt, Hitze, tragen, chemical contact, cleaning fluid, Isolierung, Leitfähigkeit, or assembly condition.
Need a Finish Review Before Quotation?
Send drawings, Materialqualität, Finish-Anforderungen, cosmetic expectations, und Inspektionsbedarf. JADE-CNC will review manufacturability before machining and finishing planning.
CNC Surface Finishing FAQ
Common CNC surface finishes include anodizing, Hardcoat-Anodisierung, Perlenstrahlen, Polieren, Bürsten, Passivierung, schwarzes Oxid, Überzug, Malerei, Pulverbeschichtung, Lasermarkierung, and tumbling.
Start with the part function. Appearance, Korrosionsbeständigkeit, Verschleißfestigkeit, electrical conductivity, Isolierung, sealing, Reinigung, and assembly fit can all affect the finish choice.
Ja. Anodizing and hardcoat anodizing can add coating thickness and may affect holes, Threads, Paarungsgesichter, and tight tolerance areas. Controlled dimensions should be marked clearly on the drawing.
Masking should be considered for threads, Löcher, sealing faces, electrical contact areas, bearing surfaces, Paarungsgesichter, and any feature that must remain uncoated or dimensionally controlled.
Ja. Passivation is commonly used for stainless steel parts to support corrosion resistance and cleanliness. Material grade and documentation requirements should be confirmed when needed.
Some plastic parts can be polished, bead blasted, vapor polished, painted, or laser marked depending on the material. The finish method should match the plastic type and appearance requirement.
Bead blasting creates a more uniform matte surface, while polishing produces a smoother or more reflective appearance. The choice depends on cosmetic expectation, Material, and visible surface requirements.
Coating thickness can affect hole fit, thread function, sealing surfaces, mating dimensions, and assembly clearance. Drawings should identify areas where thickness must be controlled or avoided.
Important checks may include visual appearance, color consistency, surface roughness, coating thickness, masking result, critical dimensions after finishing, and customer-required documentation.
Send the CAD file, 2D-Zeichnung, Materialqualität, finish name, color or appearance target, Maskierungsbereiche, roughness target, coating thickness requirement, cosmetic faces, and inspection record needs.