GE MACHINING

SURFACE FINISHING

Functional and Cosmetic Finishes for Machined Parts

From polishing and bead blasting to anodizing, plating and coating, we support surface finishes based on appearance, protection, wear resistance and dimensional requirements.

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Mechanical FinishesPolishing · Brushing · Blasting
Coatings & TreatmentsAnodizing · Plating · Coating
Dimensional ConsiderationCritical Features Controlled After Finishing

MECHANICAL FINISHES

01

Polishing

Options
Standard / Fine / Mirror Polishing
Achievable Roughness
Down to around Ra 0.2 μm on suitable materials and accessible surfaces
Typical Materials
Stainless Steel / Aluminum / Steel / Brass

Final roughness depends on material, geometry, initial surface condition and accessibility.

02

Brushing

Grain
Fine / Medium Directional Grain
Key Control
Controlled Brushing Direction
Typical Materials
Aluminum / Stainless Steel
Typical Result
Directional decorative texture

Brushing may also be combined with anodizing or passivation depending on the required final appearance.

03

Bead Blasting

Texture
Fine / Medium Matte Texture
Typical Result
Uniform Cosmetic Surface
Process Use
Standalone Finish or Pre-Anodizing Treatment

Final texture depends on blasting media, bead size, base material and process parameters.

04

Tumbling / Vibratory Finishing

Purpose
Deburring / Edge Smoothing
Typical Result
General Surface Blending
Part Type
Suitable for Batch Processing of Smaller Parts

Media selection and cycle time are reviewed around part size, edge condition and cosmetic requirements.

ANODIZING & CONVERSION FINISHES

01 / COSMETIC + PROTECTION

Type II Anodizing

  • Clear / Black / Selected Custom Colors
  • Matte / Satin / Bright Appearance Depending on Pre-Treatment
  • Cosmetic and Corrosion Protection Applications
  • Coating Thickness According to Requirement
02 / FUNCTIONAL + WEAR

Type III Hard Anodizing

  • Wear-Resistant Functional Finish
  • Higher Coating Thickness Than Type II
  • Typically Darker Appearance
  • Critical Dimensions May Require Allowance or Masking
03 / SUPPORT TO CONFIRM

Chemical / Chromate Conversion

  • Corrosion Protection
  • Electrical Conductivity Where Required
  • Paint Adhesion Support
  • Clear / Yellowish Appearance Depending on Process
Process availability to be confirmed for the exact material and specification.
COLOR & APPEARANCE CONTROL

Anodized color and texture can vary with alloy, surface preparation, coating thickness and batch conditions. For appearance-critical parts, approved samples or visual standards can be used for comparison.

DIMENSIONAL EFFECT

Anodizing adds coating thickness to the surface. Critical bores, threads, mating surfaces and tight-fit features may require masking, machining allowance or post-finishing verification.

PLATING, COATING & PAINTING

01

Electroplating / Nickel Plating

Decorative or functional plating · Corrosion resistance · Wear resistance where applicable · Electrical or conductive requirements where applicable

  • Coating thickness according to requirement
  • Critical fits may require masking or dimensional allowance
02

Powder Coating

Wide color selection · Matte / semi-gloss / gloss · Smooth / textured surface options

  • Common for sheet metal and structural components
  • Critical holes, threads and mating surfaces can be masked
03

Painting / Wet Paint

Custom colors · Matte / satin / gloss appearance · Suitable for cosmetic surfaces and assemblies

  • RAL / Pantone / approved sample matching where applicable
04

Black Oxide

Dark functional finish for steel · Minimal dimensional impact

  • Corrosion protection with oil or seal where required
05

Passivation

Common for stainless steel · Improves corrosion resistance · Maintains metallic appearance

  • Does not add a thick coating layer like plating or painting

COATING THICKNESS Coating thickness should be considered for threads, bores, bearing fits, sealing surfaces and other mating features. Masking, dimensional allowance or post-finishing verification may be required.

FINISH CONTROL & INSPECTION

01

Appearance & Color

Review of color, gloss, texture, directional grain and cosmetic consistency against the specified reference.

02

Surface Texture & Roughness

Verification of specified roughness or representative texture where the finish and accessible geometry allow.

03

Coating Coverage & Thickness

Review of coverage and required coating thickness according to the selected process and drawing specification.

04

Masking Boundaries

Verification that threads, bores, sealing faces, contacts and defined no-finish areas are protected where required.

05

Post-Finishing Dimensions

Rechecking critical fits, bores, threads and mating features after finishing where dimensional change is relevant.

06

Handling & Protection

Inspection for scratches, contact marks and cosmetic damage, followed by suitable separation and packing.

Finish acceptance is based on the process-specific requirement—not one universal surface metric.

SPECIFYING YOUR FINISH

DRAWING REQUIREMENTS

Define the functional and cosmetic surfaces.

Include material, finish type, color or appearance reference, roughness or coating thickness where applicable, and all surfaces requiring masking or dimensional control.

  • Finish standard or approved sample
  • Cosmetic faces and viewing direction
  • Threads, fits, bores and mating surfaces
  • Masking and no-finish areas
MATERIALFINISH TYPECOLOR / GLOSSTHICKNESS / RaMASKINGQUANTITY

RFQ / FINISH REVIEW

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