Custom Car Parts

High precision Machining
Precision Injection Molding

Custom Car Parts and Accessories Solutions

Sungplastic serves clients from all walks of life, including the automotive industry. We understand the unique challenges that this industry presents to suppliers’ machining capabilities. The production and assembly of critical automotive-related components must meet a high and reliable standard in order to meet customer expectations.

Custom car parts, are always custom plastic car parts or metal custom car parts, which are used for improving auto performance, appearance, drive system etc. From the mold design stage, we work closely with customers in the automotive industry to help prevent and solve potential problems and create competitive, forward-looking processes and solutions.

The technologies we provide to the automotive industry include professional precision mold making and injection molding processes, high-precision CNC machining, and innovative surface treatment technologies such as mirror polishing, material hardening, metal surface oxidation treatment, and soft hand feel for plastic parts. As an experienced Tier 2 and 3 supplier, we can also provide valuable support and insight into material selection and tool management. If you need to launch projects of custom parts for cars or custom model car parts, we will be your best partner.

Precision Automotive Mold Tool Making Capabilities

Mchining Capabilities:
CNC 3D Machining
Electrical Discharge Machining(EDM)

Tolerance limit Control (+/-):
±0.005 mm Within Cavity Shape

Precision Machining
Custom Tolerance

Manufacturing Techniques for Custom Car Parts

Manufacturing custom car parts requires various techniques depending on the type of part, material, and desired specifications. For custom car parts, it’s crucial to select the most appropriate method to achieve the desired functionality, aesthetics, and performance while adhering to safety and regulatory standards. Professional expertise and access to specialized equipment may be necessary for certain custom car parts manufacturing processes. Here are the manufacturing techniques we supply.
CNC production

CNC Machining

Precisely shape materials such as metals (aluminum, steel, etc.) and plastics. This technique is ideal for creating precise and intricate parts.

automotive parts 3d printing model

3D Printing

3D printers build custom car parts. It’s commonly used for prototyping and creating custom plastic components.

large part injection molding

Car Molding

We provide plastic injection molding, overmolding, insert molding and blow molding services to meet our customers’ demand for plastic products.

low pressure die casting

Die Casting

It’s suitable for creating injected metal (typically aluminum or zinc) parts with high precision.

precision injection molding mold

Mold Manufacturing

A properly designed and constructed injection mould tool is the key to efficiently processing plastic parts during the entire life of the project.

diecast metal process

Sheet Metal Processing

Cutting off the flat contour of the desired part with a laser or plasma and bending it to the desired shape.

plastic molding trim


Thermoplastic sheets are heated and formed over a mold to create custom plastic parts. It’s often used for interior components like dashboards and trim.

Water transfer and Printing on plastic surface

Surface Treatments

Electroplating or surface treatments (e.g., powder coating) to enhance aesthetics and protect against corrosion.

Materials Used for Custom Car Parts

There are some common materials used for custom car parts according to different properties for car part applications.

    • Aluminum: Lightweight and corrosion-resistant. Ideal for performance parts, engine components, and lightweight body panels.
    • Steel: Strong and durable. Used for structural components, chassis, and heavy-duty parts.
    • Carbon Fiber: Lightweight and high strength. Enhances aerodynamics and reduces weight in body panels and spoilers.
    • Fiberglass: Lightweight and flexible. Used for custom body kits and lightweight components.
    • Plastic (Thermoplastic): Versatile and cost-effective. Common for interior trim, dashboard components, and exterior accents.
    • Titanium: Exceptionally strong and lightweight. Used in high-performance exhaust systems and engine components.
    • Nylon: Durable and impact-resistant. Suitable for various interior components and bushings.
    • Brass: Corrosion-resistant and malleable. Used for bushings and decorative components.
    • Rubber: Flexible and vibration-absorbing. Common for gaskets, seals, and suspension bushings.
    • Cast Iron: Strong and heat-resistant. Used for engine blocks and brake rotors.
    • Stainless Steel: Corrosion-resistant and durable. Ideal for exhaust systems and custom grilles.
    • Copper: Excellent heat conductivity. Used in radiators and electrical components.
    • Plastic Composites: Lightweight and strong. Suitable for custom body panels and interior trim.
    • Chrome Plating: Provides a reflective and corrosion-resistant surface finish. Common for exterior trim and accents.
    • ABS (Acrylonitrile Butadiene Styrene): Tough and impact-resistant, good dimensional stability and easy machinability. Suitable for creating durable custom brackets and mounts and ABS car parts required a balance of strength and affordability. ABS car parts are commonly used for create interior components, such as dashboards, trim, and interior panels.

Automotive Components

  • Central control panel
  • Air conditioner air outlet plastic parts
  • Air conditioning control panel
  • Car door cover
  • Center console chrome trim
  • Car key case
  • Plug housing
  • Sealing cap
  • Connector
  • Plastic cover
  • Interior Customization
  • LED headlights, taillights, and interior lighting kits
  • Roof racks, running boards, grille guards, bull bars, and other exterior accessories

Custom Auto Parts Surface Finishing Techniques

Surface finishing techniques for custom auto parts are essential to enhance aesthetics, protect against corrosion, and improve the overall quality of the custom car parts.The choice of surface finishing technique depends on factors such as the material of the part, its intended use, durability requirements, and desired appearance. Professional expertise is often necessary to achieve high-quality surface finishes on custom auto parts.
Here are some common surface finishing techniques used for custom auto parts.

  • Painting:
    Spray Painting: Applying paint using a spray gun to achieve a smooth and even finish.
    Powder Coating: Electrostatically applying dry powder to the part, which is then cured under heat for a durable finish.
    Automotive Clear Coat: A clear, protective layer applied over paint to provide gloss and protection.
  • Polishing and Buffing:
    Buffing: Using abrasive compounds and rotary buffers to remove imperfections and achieve a high-gloss shine on metal or painted surfaces. 
    Chrome Plating: Applying a layer of chromium to metal custom car parts for a shiny, corrosion-resistant finish.
  • Anodizing:
    The electrochemical process enhances the corrosion resistance and appearance of aluminum car parts by creating a protective oxide layer.
  • Ceramic Coating:
    Applying a ceramic layer that provides long-lasting protection against UV rays, chemicals, and contaminants while enhancing gloss.
  • Hydrographics (Water Transfer Printing):
    Immersing custom car parts in a water tank with a printed film, transferring the design to the part’s surface for a customized appearance.
  • Vinyl Wrapping:
    Applying vinyl sheets with various colors, patterns, or textures to completely cover a part’s surface.
  • Brushing and Sanding:
    Creating brushed or textured finishes on metals by sanding or using abrasive pads for a distinctive appearance.
  • Bead Blasting:
    Using fine abrasive particles propelled by compressed air to clean, texture, or matte-finish surfaces.
  • Clear Film Protection (Paint Protection Film – PPF):
    Applying transparent, self-healing film to protect painted surfaces from scratches, stone chips, and UV damage.
  • Electroplating:
    Depositing a layer of metal (e.g., chrome, nickel) onto the part’s surface to enhance aesthetics and provide corrosion resistance.
  • E-coating (Electrophoretic Deposition):
    Submerging custom car parts in an electrically charged bath to apply a protective coating, especially for corrosion resistance.
  • Sandblasting:
    Using abrasive materials like sand to clean, roughen, or prepare surfaces for painting or coating.
  • Metal Brushing:
    Creating a brushed or satin finish on metals by brushing the surface with abrasive materials.
  • Tumbling and Vibratory Finishing:
    Placing custom car parts in a rotating drum or vibrating container with abrasives and chemicals to smooth or deburr surfaces.
  • Enamel and Ceramic Paints:
    Applying specialized enamel or ceramic paints for high-temperature parts like exhaust components.

Look at Some Examples of Our Work

Custom Auto Part Manufacturing Services

Creating custom car parts involves a detailed process that varies depending on the type of part you want to make and the materials you plan to use.

Concept and Design

Start by defining the purpose of the custom car part. Determine whether it’s for performance improvement, aesthetic enhancement, or functionality.
Create a detailed design or sketch of the part, including measurements and specifications. You can use software like CAD (Computer-Aided Design) for precise designs.

Material Selection

Choose the appropriate materials for your custom car part. Common materials include metals (aluminum, steel, titanium), plastics, fiberglass, carbon fiber, and composites. The choice of material depends on factors like strength, weight, and cost.


Before manufacturing the final part, it’s often advisable to create a prototype or mock-up. This helps verify the fit, form, and functionality of the part before investing in production.

Manufacturing Process

Depending on the complexity and material of the part, you may employ various techniques for auto part manufacturing: CNC Machining, Casting, 3D Printing, Fiberglass and Composite layup, Welding and Fabrication, Car Molding, etc.

Quality Control

Inspect the custom part for quality and accuracy. Ensure that it meets the specifications outlined in your design.

Finishing and Surface Treatment

Depending on the material and part, you may need to apply finishes like painting, powder coating, anodizing, or polishing to improve aesthetics and protect against corrosion.

As a metal or plastic car parts manufacturer, Sungplastic has the equipment and expertise to manufacture your custom auto parts design to spec. Create custom car parts for performance, enhance appearance, or replace broken components. Optimize the functionality and look of your parts by choosing from a wide range of materials and sleek surface finishes. We utilize various manufacturing techniques to create custom parts for cars or personalized car accessories, including custom CNC machining, custom plastic injection molding, sheet metal fabrication, custom prototyping and 3D printing and other machining capacities. Besides, we have strong post-processing capabilities, available in anodizing, passivization, electroplating, powder coating, insert installation, heat treatment etc.

Rapid custom auto parts or prototype manufacturing experts will serve your vital projects anytime. Send us a message directly if needed!

Related Auto Components Production Resources

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