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Secondary Operation Service

Over 20 different kinds of surface finishes for you.Make your part more corrosion resistant and aesthetical.
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LML's Portfolio of Secondary Operation

Secondary operation will improve aestheic or prevent injuries from sharp corner of the products.


After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts

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It enhances the appearance and durability of edges by creating a beveled or chamfered edge on a surface. It is commonly used in various industries, such as manufacturing, architecture, and interior design, to create a clean and finish

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Grinding is a process that smooths and polishes surfaces by removing small amounts of material through the use of abrasive stones or sandpaper. Grinding can be done by hand or with machines, and it is an essential tool for many trades and crafts.

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Heat treatment alters the physical and mechanical properties by heating them to a specific temperature and then cooling them at a controlled rate, improving the strength, hardness, and corrosion resistance of metal parts.

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Welding is a process that joins two or more metal components by melting and fusing them together using heat and pressure. It requires skill and precision to ensure a strong and reliable joint.

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Riveting is a process that joins two metal components securely by inserting a rivet through aligned holes and crimping its ends. It creates a strong and reliable joint. Riveting requires precision and skill to ensure a secure and reliable connection.

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Related Products

Second Operations can have either a functional or aesthetic intent.


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

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


slogan:Removes surface streaks and defects, make surface matt and rough

  • Blasting
  • Acid pickling
  • Passivation
  • Parkerising


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

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

Wide Array of Services We Offer

Call on RapidDirect’s staff to recommend the right materials from our rich selection of metal and plastic materials with different colors, infill, and hardness. 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 30% lower costs and competitive prices to help you settle your material and start your project.

Reliable supply chain

Apart from self-owned factory, we have thousands of suppliers to maintain a stable supply of materials.

Superior Quality

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

Professional Support

Creative engineers and technicians are happy to help and recommend the suitable material for you.

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 RapidDirect, 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 second pperations 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.

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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.


LML takes the stress out of manufacturing by guaranteeing the quality and consistency of every part. Each order is dimensionally and visually inspected by our in-house quality control team to make sure it meets the LML Standard. If you’re not satisfied with your order, we’ll remake your parts as fast as possible, free of charge, or refund you - whichever you prefer.
  • Why 5-Axis CNC Machining Has Superior Advatages?
    "5-Axis" generally refers to the ability of a CNC machine to move the tool in five directions, which belongs to a high precision production technology.
  • Could I have a look at your production facility for sliver contacts?
    Cold Heading & Stamping Workshop

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