CNC Machining: A Manufacturing Pillar

CNC machining marks a pivotal role in today's manufacturing world. It carves materials with unmatched precision. Among these, brass stands out as a top choice. Its popularity comes from a mix of traits. Brass blends workability, durability, and visual appeal seamlessly. This alloy serves a wide range of needs. It's perfect for detailed electrical parts and sturdy plumbing fixtures.

Brass: The Preferred Material

The choice of brass is no coincidence. Its resistance to corrosion and excellent electrical conductivity are key. These properties make it a go-to option. Industries across the board depend on brass CNC machining. They aim for the unparalleled precision and reliability it delivers. In the ever-evolving manufacturing scene, brass CNC machining by RALLY leads the way. It establishes the benchmarks for excellence.

RALLY's Excellence in Brass CNC Machining

RALLY's approach to brass CNC machining sets it apart. It not only meets but exceeds industry standards. The company's commitment to quality and precision is evident. Through RALLY, brass CNC machining achieves new heights. It provides solutions that industries trust. This commitment underscores the critical role of brass in CNC machining. It's a testament to RALLY's leadership in fostering innovation and quality.

CNC Machining Brass Turning

Section 1: Commonly Machined Brass Parts

Brass, with its excellent machinability, durability, and corrosion resistance, is a favored material in CNC machining for producing a wide variety of parts across numerous industries. Here are some commonly machined brass parts, highlighting the diversity of applications where brass is chosen for its unique properties:

1. Gears and Cogs

  • Industries: Automotive, machinery, consumer electronics.
  • Reasons for Use: Brass offers low friction, good wear resistance, and can handle moderate loads, making it ideal for gears and cogs in clocks, watches, and instrumentation.

2. Fittings and Connectors

  • Industries: Plumbing, hydraulic, pneumatic.
  • Reasons for Use: The corrosion resistance and ductility of brass make it suitable for fittings, connectors, and valves in water supply systems and pneumatic or hydraulic lines.

3. Instrumentation Components

  • Industries: Aerospace, marine, scientific instruments.
  • Reasons for Use: Precision, reliability, and resistance to corrosion are crucial for components in measuring and control instruments, where brass is often used for casings, dials, and internal parts.

4. Electrical Components

  • Industries: Electrical, electronics.
  • Reasons for Use: Brass's excellent electrical conductivity makes it a preferred material for connectors, terminals, and contact pins in electrical assemblies and electronic devices.

5. Valves and Valve Bodies

  • Industries: Oil and gas, water treatment, HVAC.
  • Reasons for Use: Durability and corrosion resistance are vital for valves controlling the flow of gases and liquids, with brass being used in ball valves, gate valves, and solenoid valves.

6. Fasteners

  • Industries: General manufacturing, construction.
  • Reasons for Use: Brass fasteners, including screws, nuts, and bolts, are chosen for their strength, corrosion resistance, and anti-galling properties, suitable for both aesthetic and functional applications.

7. Decorative Items

  • Industries: Architecture, interior design.
  • Reasons for Use: The aesthetic appeal of brass, along with its machining ease, allows for the creation of decorative items like door handles, light fixtures, and architectural accents.

8. Marine Hardware

  • Industries: Marine, boating.
  • Reasons for Use: The natural resistance of brass to saltwater corrosion makes it ideal for marine hardware, such as boat fittings, propellers, and navigational instruments.

9. Musical Instruments

  • Industries: Musical instrument manufacturing.
  • Reasons for Use: Brass is extensively used in the manufacture of musical instruments like trumpets, trombones, and horns for its acoustic properties and durability.

Advantages of Brass for CNC Machining:

  • Machinability: Brass is one of the easiest materials to machine, allowing for tight tolerances and excellent surface finishes.
  • Corrosion Resistance: It withstands corrosive environments, making it suitable for outdoor and marine applications.
  • Aesthetic Appeal: Brass has a distinctive, attractive finish that can be polished, brushed, or aged for decorative purposes.
  • Versatility: It can be used in a wide range of applications, from industrial components to consumer products.

The use of brass spans across sectors, showcasing its versatility and performance in conditions requiring durability, precision, and aesthetic value.

Brass Machining Material
CNC Machining Brass Parts
brass cnc machining service

Section 2: Types of Brass (Brass Grades) for CNC Machining

Brass, an alloy of copper and zinc, comes in various grades, each suited for different machining and manufacturing applications. The choice of brass type significantly affects the outcome of CNC machining processes due to variations in strength, corrosion resistance, and machinability. Here's an overview of the most commonly used brass grades for CNC machining:

1. C36000 (Free-Cutting Brass)

  • Characteristics: High machinability, excellent mechanical properties, and good corrosion resistance.
  • Applications: Precision components, fittings, fasteners, and gears.

2. C35300 (High Leaded Brass)

  • Characteristics: Superior machinability, moderate strength, and good corrosion resistance.
  • Applications: Complex parts where extensive machining is required, decorative hardware.

3. C48500 (Naval Brass)

  • Characteristics: Good strength, excellent corrosion resistance, especially in saltwater environments.
  • Applications: Marine hardware, propeller shafts, and decorative applications where corrosion resistance is critical.

4. C46400 (Naval Brass "Lead-Free")

  • Characteristics: Good strength and corrosion resistance, similar to C48500 but without lead.
  • Applications: Applications requiring lead-free materials, such as fittings and components in potable water systems.

5. C26000 (Cartridge Brass)

  • Characteristics: Good ductility, cold workability, and corrosion resistance.
  • Applications: Ammunition casings, radiator components, and decorative metalwork.

6. C28000 (Muntz Metal)

  • Characteristics: Medium strength, excellent hot-working properties, and good corrosion resistance.
  • Applications: Architectural metalwork, fasteners, and industrial applications.

7. C37700 (Forging Brass)

  • Characteristics: High strength, excellent forgeability, and good corrosion resistance.
  • Applications: Forged components such as valves, fittings, and complex parts requiring hot forging.

Factors Affecting the Choice of Brass for CNC Machining:

  • Machinability: Grades like C36000 are chosen for their ease of machining.
  • Corrosion Resistance: Grades such as C46400 and C48500 are preferred in marine environments.
  • Mechanical Properties: Depending on the application's strength requirements, different grades are selected.
  • Regulatory Requirements: For applications involving potable water, lead-free grades are essential.

Choosing the right brass grade for CNC machining involves balancing these factors to meet the specific requirements of the application. Each grade offers a unique combination of properties, making it suitable for various industries, including aerospace, automotive, electrical, and marine.

CNC Brass Machining Waveguide Flanges

Section 3: Surface Finishes for CNC Machined Brass Parts

Surface finishes for CNC machined brass parts can significantly affect the appearance, performance, and durability of the finished components. The choice of finish depends on the application, desired aesthetics, and any functional requirements like corrosion resistance or electrical conductivity. Here's an overview of common surface finishes for CNC machined brass parts:

1. As-Machined Finish

  • Description: The natural finish left after machining without any additional processing. It may include tool marks and minor imperfections.
  • Applications: Suitable for parts where surface finish is not critical to the part's functionality or aesthetics.

2. Polished Finish

  • Description: Achieved by mechanically polishing the brass surface to a high shine, this finish can range from a satin to a mirror-like appearance.
  • Applications: Used for decorative parts or where a high aesthetic quality is required.

3. Brushed Finish

  • Description: Produced by brushing the surface with a fine abrasive material to create a uniform, parallel grain texture.
  • Applications: Ideal for decorative components that need a matte, textured appearance which can also hide fingerprints and minor imperfections.

4. Sandblasted Finish

  • Description: Created by blasting the surface with abrasive materials. This process results in a uniform, matte surface that diffuses light.
  • Applications: Suitable for parts requiring a non-reflective surface. Often used to prepare the surface for painting or coating.

5. Plated Finishes

  • Types: Chrome, nickel, gold, and zinc are common plating materials for brass.
  • Description: Electroplating or electroless plating methods are used to deposit a thin layer of metal on the brass surface.
  • Applications: Used to enhance corrosion resistance, electrical conductivity, or aesthetic appeal.

6. Anodized Finish

  • Description: Although more common for aluminum, brass can also be anodized through specific processes to increase corrosion resistance and to add color.
  • Applications: Suitable for decorative applications and where additional surface protection is needed.

7. Powder Coated Finish

  • Description: A dry powder paint is electrostatically applied and then cured under heat to form a skin-like layer.
  • Applications: Offers excellent durability and corrosion resistance. Suitable for parts exposed to harsh environments.

8. Passivation

  • Description: A chemical treatment process that removes impurities from the surface, enhancing the natural corrosion resistance of the brass.
  • Applications: Ideal for components used in marine environments or where long-term resistance to oxidation is necessary.

9. Chemical Film Coating

  • Description: Application of a chemical film that provides a barrier against corrosion without changing the part's dimensions.
  • Applications: Used for electrical and electronic components where conductivity and resistance to corrosion are required.

Each of these finishes has its advantages and suitability for different applications. The choice will depend on the specific requirements of the part, including environmental exposure, mechanical stresses, and aesthetic expectations.

polishing brass parts
Powder Coating Brass parts
Passivation Brass Parts
Brushing Brass Parts
Anodizing Brass Parts
Electroplating brass parts


In the realm of CNC machining, the selection of brass as a material highlights its versatility, durability, and aesthetic appeal across a wide range of applications. From the precision required in electrical components to the resilience needed in marine environments, the choice of brass grade is crucial to meeting the demands of each unique project.

At RALLY, we pride ourselves on our expertise in brass CNC machining services. Our team is dedicated to providing tailored solutions that meet the highest standards of quality and precision. Whether your project requires the machinability of Free Cutting Brass, the corrosion resistance of Naval Brass, or the aesthetic qualities of Red Brass, RALLY is here to turn your vision into reality.

Feel free to send us an inquiry! We're ready to partner with you, leveraging our expertise to achieve outstanding results that exceed your expectations.

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