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Surface Finishing Service

Over 20 different kinds of surface finishes for you.

Make your part more corrosion resistant and aesthetical.


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Home / All Surface finishing service
FinishServiceApplicable toMachining marksComestic availabilityTolerance
Smooth MachiningCNC machining, sheet metal fabricationMetals, PlasticsClean and smooth without burrsCNC machiningTolerance are not affected
PolishingCNC machiningMild steel, aluminum, stainless steel

Remove the veins of the metal surfaceAlways comesticMet after polishing
BrushingCNC machining, sheet metal fabricationMetalsSurface defects are partially removedOn requestMet after brushing
Shot BlastingCNC machining, sheet metal fabricationMetalsRemoves surface streaks and defectsOn requestTolerance are not affected
Powder CoatingCNC machining, sheet metal fabricationMetals, carbon fiberMetal defects will be totally hidenNoMet after coating
Spray PaintingCNC machining, sheet metal fabricationMetalsPraying paint, pigment, or color to a solid surface as a colored protective layerNoMet after painting
Black OxideCNC machining, sheet metal fabricationSteel, copper, magnesiumReduce the light reflectionNoMet before powder coating
PassivationCNC machiningAluminum, copper, stainless steel, titaniumSmooth and uniform surfaceNoTolerance are not affected
ParkerisingCNC machiningMetalsPretreatment of painting to strengthen film adhesionNoTolerance are not affected
AnodizingCNC machining, sheet metal fabricationAluminum、Magnesium、TitaniumSuccessful wear resistance surface finish technology of aluminum alloyOn requestMet after anodizing
ElectroplatingCNC machiningMetalsImprove wear resistance, electrical conductivity, reflective property, corrosion resistance and aesthetics of the metal productNoMet after electroplating
Electrophoresis DepositionCNC machiningMetalsMore environmentally friendly than other coating techniqueNoMet after electrophresis deposition
Baking finishCNC machining, sheet metal fabricationMetalsResistant to water, dust,grease and easy to cleanOn requestMet after baking finish
Thermal sprayingCNC machining, sheet metal fabricationMetalsAs protective or functional surface layerNoTolerance are not affected
Physical vapor depositionCNC machining, sheet metal fabricationMetalsAs protective or functional surface layerNoTolerance are not affected
Antirust oil for electrostatic sprayingAntirust oil for electrostatic sprayingMetalsAntirustNoTolerance are not affected
Cleaning servicesCNC machining, sheet metal fabricationMetalsRemove the carbonizing film and oil of the surfaceNoTolerance are not affected

Cosmetic Finishes

Surface finishes can have either a functional or aesthetic intent. Finishes that cater to both aspects are classified as cosmetic finishes and are frequently employed for enhancing the appearance of different parts. The fabrication of these parts demands additional measures to minimize defects such as tool-induced marks and scratches.


There is no necessary to have aesthetic look. Machining veins will be seen primarily.

  • Smooth machining
  • Passivation
  • TYPE III andozied
  • Glossing
  • Brushing
  • Black oxide
  • Mechanical Polishing
  • Etching
  • Degreasing
  • Electroplating
  • Electrophoresis deposition

Comestic on Request

Finishes can be either cosmetic or non-cosmetic as per request

  • Blasting
  • Acid pickling
  • Passivation
  • Parkerising

Comestic by default

These finishes will always serve a cosmetic function

  • Chemical or electrochemical polishing
  • Blasting+Anodizing
  • Glossing+Brushing
  • Glossing+Polish
  • Powder coating

Wide Array of Materials We Offer

Every material we utilize comes from reputable suppliers and is thoroughly inspected to ensure they can be matched to various manufacturing styles, from plastic injection molding to sheet metal fabrication.

Competitive Prices

You are guaranteed to enjoy a 30% reduction in costs and competitive prices, which will assist you in procuring your materials and initiating your project.

Reliable supply chain

In addition to our own factory, we have a network of suppliers to ensure a consistent supply of materials. 

Superior Quality

Each of our material bears certified material certification to guarantee excellent quality for your parts.

Professional Support

Our team of innovative engineers and skilled technicians is eager to assist you and provide recommendations for the most suitable materials for your needs.

Introduction to the common process of cnc metal materials

We can generate instant machining quotes for 50+ metals and plastics.

Metal CNC services

LML provides the most advanced CNC metalworking services to ensure superior product quality and fast delivery. We have more than 60 metal milling machines and metal lathes that we can offer with the capacity and competitive prices. We accept small orders for CNC metal parts with a MOQ of 1 and can handle more complex CNC machining work, while we accept urgent orders. With LML, you can get the perfect products and thoughtful service you want, we are your friends in China.

Metal machining

Metal machining is the process of cutting down a raw piece of metal to create a desired shape or object. This process is done most accurately with a CNC (Computerized Numerical Control) machine, which can produce almost any three dimensional object designed via CAD (Computer Aided Design) software. Our network of machinists mainly uses 3- and 5- axis CNC machines for producing any metal parts that pass our online DFM checks. State-of-the-art metal CNC machines, like the ones we use, are able to cut complicated features on parts with great accuracy, while maintaining tight tolerances.

Metal CNC Milling

CNC milling removes materials from the workpiece to create custom-designed parts with flat surface using cutting tool or multi-point milling cutters.

WIth our 3-axis & 5-axis CNC milling services, you can get milled parts with tight tolerance up to 0.02mm (±0.0008 in.)

Metal CNC Turning

CNC turning shears materials from the ouside of a rod at incredible speeds using a spinning tool. At Rapid Direct, we apply 50+ CNC lathes and CNC turning centers to create round or cylindrical turned parts with extreme precision that consistantly meet customers’ higher.

Gallery of surface finishing part made by LML

The metal part can serve as functional or aesthetic purpose,and the way of usage will decide on the type of surface finish.

Defining an A and a B side

We can generate instant machining quotes for 50+ metals and plastics.

Surface finishing often leaves aesthetic defects on your parts, such as hang marks for anodizing. Defining an Aand a B-side in your design will ensure that the most important areas of your part remain free of defects

In this image you can see how you can define an A-side and a B-side in your technical drawing:

A side: Indicates the most aesthetically importantsurface, typically the visible side of your product.

B side: Indicates the side that is not aesthetically important, typically the side hidden from visibility after assembly

For the primary surface (A-side) of your part, we guaranteedefect-free production. In contrast, secondary surfaces (B-side)may be machined with hanging marks and other minor defects. Bside surfaces, like the rest of your part, will be free of scratches.stains and blemishes.

Manufacturing vetted network of our service

We look forward to delivering high-quality products and professional services to meet your expectations and requirements.

Consistency requirements

Each part must be visually consistent across the same batch.meaning:

  • Same grit must be used across parts for sanding orbrushing
  • Brush marks must be in the same direction*
  • Color must be consistent to the same pantone when parts are placed next to each other
  • Gloss units must be consistent across the batch

* Manual brushing marks will be as unidirectional aspossible. Please note that for rounded geometries, brushingmarks may not be entirely unidirectional.*

Visual inspection conditions

The surface quality of every part must meet the followingconditions:

  • Distance: 50cm +10cm (19,7 in + 3,9 in) with a 10/10 vision(or corrected)
  • Incidence angle: Approximately 45 in all directions
  • Lighting conditions: 500-1000 Lux, color 3300-5300 Kelvin(neutral white)

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The metal part can serve as functional or aesthetic purpose,and the way of usage will decide on the type of surface finish.


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