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, inspection method, 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, si adatta, resists corrosion, handles wear, conducts electricity, insulates, seals, and passes inspection. JADE-CNC reviews finish requirements together with material, geometria, segni di lavorazione, aree di mascheramento, tolerance impact, and cosmetic surfaces.
This guide is a practical reference for RFQ preparation. Actual finish capability is confirmed according to drawing requirements, grado del materiale, part geometry, coating process, ambito di ispezione, and project quantity.
RFQ review note
For faster review, include finish name, colore, visible faces, aree di mascheramento, roughness target, coating thickness if required, inspection method, and any functional surfaces that must remain controlled after finishing.
Surface function
Start With the Function of the Surface
Define matte, glossy, brushed, polished, nero, natural, or color-matched surfaces and identify visible cosmetic faces.
Confirm whether the part faces humidity, salt, outdoor exposure, prodotti chimici, or cleaning fluids.
Mark sliding surfaces, volti di accoppiamento, threaded areas, and features where coating buildup may affect fit.
Clarify conductive, insulating, grounding, or masking requirements before anodizing, rivestimento, or plating.
Review coating thickness, mascheramento, 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 | Typical Use | Materials Often Reviewed | Key RFQ Details |
|---|---|---|---|
| Anodizzazione | Color, resistenza alla corrosione, and improved surface durability for aluminum parts. | Alluminio 6061, 7075, 2024, 6082 | Color, Type II or hardcoat, aree di mascheramento, visible faces, thickness if controlled. |
| Sabbiatura delle perle | Uniform matte appearance and reduced machining marks before anodizing or cosmetic review. | Alluminio, acciaio inossidabile, ottone | Volti cosmetici, protected dimensions, acceptable surface texture, before/after finish condition. |
| Black Oxide | Dark surface appearance and mild corrosion protection for steel components. | Carbon steel, alloy steel, acciaio per utensili | Required appearance, post-treatment oiling, threaded areas, mating surfaces. |
| Passivazione | Cleaning and corrosion-resistance support for stainless steel machined parts. | Acciaio inossidabile 304, 316, 17-4PH | Grado del materiale, standard if specified, cleanliness needs, documentation requirement. |
| Lucidatura / Brushing | Directional or reflective appearance for visible metal surfaces. | Acciaio inossidabile, alluminio, ottone | Grain direction, visible side, roughness target, edge protection, sample approval if needed. |
| Pittura / Verniciatura a polvere | Color, aspetto, isolamento, and protective coating for housings or panels. | Alluminio, acciaio, selected assemblies | Color code, spessore del rivestimento, mascheramento, fori filettati, adhesion or cosmetic requirement. |
Dimensional and inspection planning
How JADE-CNC Reviews Finish Impact
Drawing Review
Check finish symbols, notes, dimensioni critiche, GD&T, visible faces, discussioni, buchi, and mating surfaces.
Material Match
Confirm whether the requested finish is suitable for aluminum, acciaio inossidabile, rame, ottone, acciaio, or engineering plastic.
Masking Plan
Identify areas that must stay conductive, uncoated, threaded, dimensionally controlled, or cosmetically protected.
Ambito di ispezione
Plan visual checks, roughness review, coating thickness record, CMM report, or finish approval reference when required.
RFQ checklist
Information to Share With Your Drawings
Anodizzazione, hardcoat anodizing, ossido nero, passivazione, lucidatura, sabbiatura, pittura, placcatura, or powder coating.
Natural, nero, clear, matte, lucentezza, brushed direction, volti cosmetici, and sample approval expectation.
Discussioni, buchi, noioso, sealing faces, electrical contact zones, volti di accoppiamento, and surfaces that need masking.
Coating thickness, Ra target, pre-finish dimensions, after-finish dimensions, and acceptance tolerance.
Visual inspection, dimensional report, CMM report, coating check, controllo della rugosità, CoC, or customer format.
Outdoor exposure, salt, Calore, Indossare, chemical contact, cleaning fluid, isolamento, conduttività, or assembly condition.
Need a Finish Review Before Quotation?
Send drawings, grado del materiale, requisiti di finitura, cosmetic expectations, e le esigenze di ispezione. JADE-CNC will review manufacturability before machining and finishing planning.
CNC Surface Finishing FAQ
Common CNC surface finishes include anodizing, hardcoat anodizing, sabbiatura, lucidatura, brushing, passivazione, ossido nero, placcatura, pittura, verniciatura a polvere, laser marking, and tumbling.
Start with the part function. Appearance, resistenza alla corrosione, resistenza all'usura, conduttività elettrica, isolamento, sigillatura, pulizia, and assembly fit can all affect the finish choice.
SÌ. Anodizing and hardcoat anodizing can add coating thickness and may affect holes, discussioni, volti di accoppiamento, and tight tolerance areas. Controlled dimensions should be marked clearly on the drawing.
Masking should be considered for threads, buchi, sealing faces, electrical contact areas, bearing surfaces, volti di accoppiamento, and any feature that must remain uncoated or dimensionally controlled.
SÌ. 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, materiale, 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, rugosità superficiale, spessore del rivestimento, masking result, critical dimensions after finishing, and customer-required documentation.
Send the CAD file, 2D drawing, grado del materiale, finish name, color or appearance target, aree di mascheramento, roughness target, coating thickness requirement, volti cosmetici, and inspection record needs.