Automotive CNC Machining Services Custom Automotive Parts

Yumei Hardware has deep expertise in high-precision automotive CNC machining, specializing in providing one-stop customized automotive parts and prototype product solutions for global OEM manufacturers, tier suppliers, and aftermarket manufacturers. Certified to ISO 9001:2015, ISO 14001:2015, and IATF 16949:2016, we adhere to international quality standards. With fast turnaround times and 24/7 support, we ensure on-time delivery to meet the high demands of the automotive industry.
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Why Choose Us to Manufacture Automotive Components?

YUMEI specializes in reliable prototyping and production of automotive components, from simple to complex designs. With decades of manufacturing expertise, advanced machining technologies, and strict quality standards, we turn your concepts into high-performance solutions. Whether for critical Powertrain System or Chassis System, YUMEI is your trusted partner for precision-engineered results.
ISO Certification
YUMEI has officially been certified with ISO 9001:2015 and ISO 14001:2015. This certification not only represents authoritative recognition of our precision manufacturing capabilities but also ensures that every step, from design and processing to delivery of automotive components, adheres to strict quality control and environmental standards. We guarantee that product accuracy and stability consistently meet international standards while promoting a green production philosophy.
Short Delivery Time
Equipped with over 150 sets of advanced manufacturing devices—including high-efficiency 5-axis and 8-axis CNC machining centers—We meet various delivery requirements, including urgent high-precision samples within 24 hours, new molds completed in 5 days with samples delivered within 7 days, standard prototype parts delivered within 5-7 days, and mass production orders completed within 2-4 weeks. Our delivery timelines are adaptable to meet the needs of automotive projects.
Production Capacity
Yumei has deep expertise in the precision manufacturing field and is equipped with over 150 advanced processing machines, covering a full range of equipment such as CNC turning, multi-task turn-mill centers, CNC milling machines(3-axis,4-axis and 5-axis), Swiss turning machines(3-axis,5-axis and 8-axis), automatic lathe machines, cold forging and thread rolling machines, CNC bending machines, laser cutting machines, and welding machines etc. With our comprehensive manufacturing capabilities, we respond flexibly to various product processing needs, providing efficient and precise one-stop production solutions for your projects.
Processing Technology
As a professional manufacturer integrating design, manufacturing, sales, and service, Yumei Hardware is committed to the production of high-quality precision parts. We integrate key processes such as CNC turning, CNC milling, Multi-task turn-mill, Swiss turning, automatic lathe processing, cold forging, and sheet metal processing. With our comprehensive technical capabilities, we provide customers with a complete solution from concept to finished product, ensuring that each item is precise, reliable, and meets the diverse needs of precision manufacturing.
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Custom Automotive 5-Axis Machining

Yumei's five-axis machining of automotive parts covers core and auxiliary components across various vehicle systems. Specifically, it includes powertrain components such as engine cylinder heads, pistons, connecting rods, and more; transmission system parts like gear shafts, gearbox housings, and differential components; chassis and suspension parts such as control arms, steering knuckles, shock absorber assemblies, etc. Additionally, it can process fuel system, brake system, turbocharger system components, and custom automotive fasteners.


Yumei is equipped with 3-axis, 4-axis, 5-axis, and Swiss CNC machining equipment, capable of performing a wide range of processes, including CNC turning, milling, sheet metal forming, drilling, and rapid prototyping. The company can achieve ultra-high precision up to ±0.01mm, enabling the machining of complex geometries, irregular structures, and parts with strict tolerance requirements. It also specializes in high-precision machining for small-diameter automotive fasteners.

Machining Precision of Automotive Parts

With 3-axis, 4-axis, 5-axis, and Swiss CNC machining equipment, we are capable of performing various processes such as CNC turning, milling, sheet metal fabrication, drilling, rapid prototyping, and more. We can achieve ultra-high precision with a tolerance of up to ±0.005mm.

Lightweight Component Manufacturing

Through integrated processing and the selection of lightweight materials such as aluminum, titanium, and magnesium alloys, we assist automotive companies in achieving overall vehicle weight reduction, improving fuel efficiency for combustion engine vehicles and extending the range of electric vehicles.

End-to-End Services

We provide a comprehensive solution starting from early-stage DFM analysis, CAD/CAM optimization, and material selection guidance, to mid-stage rapid prototyping, multi-axis CNC machining, heat treatment, and surface processing. In the later stages, we offer CMM precision inspection, component pre-assembly, customized packaging, and inventory management.

Flexible Delivery

We meet various delivery requirements, including urgent high-precision samples within 24 hours, new molds completed in 5 days with samples delivered within 7 days, standard prototype parts delivered within 5-7 days, and mass production orders completed within 2-4 weeks. Our delivery timelines are adaptable to meet the needs of automotive projects.

Our Automotive Manufacturing Capabilities

Our automotive manufacturing capabilities combine precision machining with specialized processes, leveraging multi-axis CNC technology and advanced material techniques. We focus on delivering high-precision, high-reliability components to support the efficient and safe operation of vehicle.
CNC Machining Aluminum Parts

5 Axis CNC Machining

Utilizing advanced 5-axis CNC machining centers, we process complex curved surfaces and precision automotive components, with a particular focus on parts like engine components, suspension arms, and other irregularly shaped structural parts.

Sheet metal cutting process in industrial workshop

Sheet Metal Fabrication

We provide high-precision sheet metal cutting, bending, and welding services, ensuring automotive parts such as body panels, chassis parts, and brackets are lightweight, strong, and capable of withstanding high temperatures. Our sheet metal processing capabilities are tailored to meet the demanding requirements of automotive manufacturers for durability and performance.

3 Axis CNC Milling

CNC Milling

Using advanced CNC milling machines, we perform intricate machining of complex shapes and high-precision automotive components. Our milling capabilities allow us to meet the high tolerance requirements o, ensuring reliability and performance in every part.

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CNC Turning

Using high-precision CNC turning machines, we manufacture rotating parts such as shafts, pistons, and other cylindrical components. Our turning processes guarantee high accuracy, rigidity, and surface integrity, while being capable of processing specialized materials like steel, aluminum alloys, and titanium, which are commonly used in automotive applications for their strength and light weight.

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Mill-Turn Machining

Combining milling and turning processes, completing multi-surface machining in a single setup, making it ideal for parts like engine components, valve housings, and turbochargers that require both turning and milling operations to achieve critical tolerances and assembly compatibility.

Practical operation scenario of positioning equipment in a Swiss CNC machining workshop

Swiss CNC Machining

Using Swiss CNC machines for high-precision machining of small components, in parts like sensor shafts, micro connectors, and other miniature precision parts. These are ideal for producing intricate and complex components for advanced automotive systems.

Automotive CNC Machining Customer Cases

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Manifold-Trans Air Filter
17 4PH Harness Mount
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Materials for Automotive CNC Machining

Selecting the appropriate materials for core automotive components requires achieving a precise balance among lightweight design, structural strength, and corrosion resistance. We possess extensive experience in processing various high-performance automotive materials.
Metals Machining
Plastics Machining

Aluminum

Color:
Silver-white
Subtypes:
Aluminum 6061,6061-T6 Aluminum 2024, Aluminum 5052Aluminum 5083, Aluminum 6063, Aluminum 6082, Aluminum 7075,7075-T6, Aluminum ADC12 (A380)
Available Finish:
  • Anodizing Types II: 5-25 μm coating thickness, 16 color options
  • Type III (Hardcoat): 25-50+ μm thickness, Hardness 60-70 Rockwell C
  • Powder coating: 75-125 μm thickness, 2,000+ color options
  • Bead Blasting: 150-600 grit media for controlled surface texture
  • Plating: 5-25 μm thickness, Hardness 48-52 Rockwell C    

Brass

Color:
Yellow
Subtypes:
Brass C27400, Brass C28000, Brass C36000
Available Finish:
  • Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
  • E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
  • Anodization: Enhances corrosion resistance and adds color.
  • Passivation: Effectively inhibits oxidation of brass parts, extending their service life in harsh operating conditions.

Copper

Color:
Reddish-brown
Subtypes:
Copper C101(T2), Copper C103(T1), Copper C103(TU2), Copper C110(TU0), Beryllium Copper
Available Finish:
  • Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
  • E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
  • Anodizing: Enhances corrosion resistance and adds color.
  • Passivation: Effectively inhibits oxidation of brass parts, extending their service life in harsh operating conditions.
Magnesium

Magnesium

Color:
Light Silver-white
Subtypes:
Magnesium Alloy AZ31B, Magnesium Alloy AZ91D
Available Finish:
  • Anodizing: Forms a dense and hard oxide layer (magnesium oxide) on the surface to improve corrosion resistance and wear resistance. It can also be dyed in various colors such as black or gray.
  • E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
  • Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
  • Passivation: Effectively inhibits oxidation of brass parts, extending their service life in harsh operating conditions.

Steel

Color:
Silver-gray
Subtypes:
Steel1018,1020,1025,1045,1215,4130,4140,4340,5140,A36, Die steel, Alloy steel, Chisel tool steel, Spring steel, High speed steel, Bearing steel, Cold rolled steel, SPCC
Available Finish:
  • Anodizing: Forms a dense and hard oxide layer (magnesium oxide) on the surface to improve corrosion resistance and wear resistance. It can also be dyed in various colors such as black or gray.
  • E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
  • Powder Coating: It offers strong durability and allows for a wide range of color and texture selections.
  • Heat Treatment:Uses controlled heating and cooling cycles to enhance the metal’s mechanical properties. This process increases hardness, improves strength

Stainless Steel

Color:
Silver-gray
Subtypes:
Stainless SteelSUS201, Stainless SteelSUS303, Stainless SteelSUS 304, Stainless SteelSuS316, Stainless SteelSUS420, Stainless SteelSUS430, Stainless SteelSuS431, StainlessSteelSUS440C, Stainless SteelSUS630/17-4PH, Stainless SteelAlS1304, Stainless SteelSUS316L
Available Finish:
  • Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
  • Powder Coating: It offers strong durability and allows for a wide range of color and texture selections.

Titanium

Color:
Silver
Subtypes:
Titanium Alloy TA1, Alloy TA2, Alloy TC4/Ti-6Al 4V
Available Finish:
As machined, Polishing, Sand Blasting, Tumbling, Electropolish, Alodine, Anodizing, Electroless nickel, Painting, Powder coating, Brushed finish

ABS

Color:
Black,White
Subtypes:
ABS Beige(Natural)ABS Black, ABS Black Antistatic, ABS Milky White, ABS+PC Black, ABS+PC White
Available Finish:
  • Sanding:Remove obvious machining marks for a smooth surface
  • Painting:Color matching or applying a coating to enhance product appearance.
  • Vapor Polishing: Solvents can smooth transparent ABS and make it glossy.
  • Texturing: Add patterns or textures to increase friction and enhance a refined feel.

Acetal

Color:
Dark brown(coffee),Black,Blue,White
Subtypes:
Dark brown (coffee)POM 100AF, POM Black, POM Blue, POM White
Available Finish:
  • Machined Finish:CNC machining provides a standard surface finish.
  • Bead Blasted Finish:Creates a textured surface to improve grip and feel.
  • Polished Finish:Produces a smooth and glossy finish.

HDPE

Color:
Black, White
Subtypes:
HDPE Black, HDPE White
Available Finish:
Because HDPE parts are generally difficult to coat, they are often left in their machined state. Various CNC machining methods—such as milling, turning—along with suitable post-processing options, can produce different surface finishes.

Nylon PA

Color:
Blue,Black,White,Beige
Subtypes:
PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black

PEEK

Color:
Beige,Black
Subtypes:
PEEK Beige(Natural), PEEK Black
Available Finish:
  • Machined Finish: CNC machining provides a standard surface finish.
  • Bead Blasted: Creates a textured surface to improve grip and feel.
  • Polished: Makes the surface smoother, improving appearance and reducing friction.
  • Coated: Enhance wear resistance and lower friction.

Phenolic

Color:
Black,Red
Subtypes:
Phenolic black,Phenolic red
Available Finish:
As machined, Painting, Powder coating, Brushed finish

Polycarbonate

Color:
White
Available Finish:
  • as-machined: retain the obvious lines left by the tools and machine tools during the machining process.
  • Vapor Polishing:Vaporize solvents to act on the surface, smoothing it for enhanced material transparency.
  • Bead Blasting:Creates a matte texture while eradicating minor blemishes.
  • Painting: Adds many colors to the product and forms a protective coating, enhancing appearance and extending service life.
  •  Laser Engraving:Engraves logos or customized patterns on the workpiece surface.
  • Anodizing:Effectively enhances the workpiece's corrosion resistance.

PVC

Color:
Black,White
Available Finish:
  • Painting/Coating: Enhance aesthetics (color customization) and add a protective layer against scratches.
  • Polished: Makes the surface smoother, improving appearance and reducing friction.
  • Texturing: Add patterns or textures to increase friction and enhance a refined feel.

Surface Finishing for Automotive CNC Machining

Automotive components need to maintain stable and reliable performance in variable environments such as long-term vibration, alternating high and low temperatures, and chemical corrosion. Therefore, the selection of surface treatment processes is crucial. We provide a series of customized surface treatment solutions for automotive application scenarios to meet the requirements of various harsh working conditions..

As Machined

As Machined
Ra 3.2μm / Ra 126μin
Removes sharp edges and burrs

Anodizing

Anodizing
Forms an oxide layer on the surface of metals (e.g., aluminum, magnesium) to provide durability and corrosion resistance.

Polishing

Polishing
Ra 0.2μm / Ra 8μin
Makes the surface smoother, improving appearance and reducing friction.

Sand Blasting

Sand Blasting
Ra 3.2μm / Ra 126μin
Removes sharp edges and burrs
Uses high-speed abrasive particles to strike the surface and remove rust, old coatings, oxides, and impurities.

Brushed Finish

Brushed Finish
Forms uniform, fine linear textures on metal or other materials through mechanical processing, creating a satin finish that is resistant to fingerprints.

Powder Coating

Powder Coating
Uses powder coatings for a dry finishing process, offering strong durability and allows for a wide range of color and texture selections.

Conventional Spray

Conventional Spray
Delivers uniform, fine-grained coverage for diverse surfaces. Easy to apply, fast-drying, and reliable—ideal for professional finishing, household touch-ups, and industrial coating needs. A trusted choice for consistent, smooth results.

Electroplating

Electroplating
Forms a dense, corrosion-resistant metal coating—such as through galvanizing, nickel plating, or chrome plating—by reducing dissolved metal cations using electric current.

Black Oxidize

Black Oxidize
Ra 3.2μm / Ra 126μin
Removes sharp edges and burrs
Uses high-speed abrasive particles to strike the surface and remove rust, old coatings, oxides, and impurities.

Electropolish

Electropolish
Removes micro-burrs and impurities from metal surfaces using electrochemical principles.

Alodine

Alodine
Immerses aluminum in a chromate solution to form a thin, dense conversion coating that improves corrosion resistance and enhances paint or coating adhesion.

Heat Treatment

Heat Treatment
Uses controlled heating and cooling cycles to enhance the metal's mechanical properties. This process increases hardness, improves strength

Smooth Machining

Smooth Machining
Ra 1.6μm / Ra 63μin

Fine Machining

Fine Machining
Ra 0.8μm / Ra 32μin

Automotive Parts Tolerance Standards

We strictly control tolerances in accordance with industry standards to ensure the high precision and reliability of the parts when processing automotive parts. According to the functional requirements of different parts, we adopt tolerance standards of ±0.01mm or more stringent ones. In addition, we also ensure that the surface roughness meets high-quality standards to guarantee the stable performance of the parts in automotive systems.
Permissible deviations in mm for ranges in nominal lengthsTolerance class:designation (description)
f (fine)m (medium)c (coarse)
Linear Dimensions
0.5 up to 3±0.05±0.1±0.2
over 3 up to 6±0.05±0.1±0.3
over 6 up to 30±0.1±0.2±0.5
over 30 up to 120±0.15±0.3±0.8
over 120 up to 400±0.2±0.5±1.2
over 400 up to 1000±0.3±0.8±2.0
over 1000 up to 2000±0.5±1.2±3.0
over 2000 up to 4000-±2.0±4.0
External Radius and Chamfer Heights
0.5 up to 3±0.2±0.2±0.4
over 3 up to 6±0.5±0.5±1.0
over 6±1.0±1.0±2.0
Angular Dimensions
up to 10±1º±1º±1º30'
over 10 up to 50±0º30'±0º30'±1º
over 50 up to 120±0º20'±0º20'±0º30'
over 120 up to 400±0º10'±0º10'±0º15'
over 400±0º5'±0º5'±0º10'

Customer Reviews

Anya Forger
James Sullivan
“Service is excellent.”
After comparing several auto parts manufacturers, we are most satisfied with the comprehensive services provided by Yijin Hardware. Not only do their parts meet the standards for surface treatment and precision, but they are also able to adjust delivery times flexibly according to our project schedule. Their after-sales service is also very prompt. Yijin is a trusted long-term partner.
John Doe
Antoine Lefèvre
“Truly professional”
We have been working together for over two years, and the defect rate of the parts your company processes is extremely low, no issues encountered so far. During our last project, when we had an urgent schedule change, you responded quickly, adjusted production overnight, and delivered on time. This truly demonstrated the value of a reliable supply chain.
Lya Keller
Luca Moretti
“The products are very reliable.”
The quality is very stable, especially with strict tolerance control. The parts almost never require secondary screening upon arrival. What’s even more remarkable is the high level of cooperation. During the frequent adjustments in our R&D and testing phases, you’ve always been able to respond flexibly, acting more like a partner than just a supplier.

We can also engage in the processing of parts for more industries.

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Automotive

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Medical

Energy

Energy

Motorcycle

Motorcycle

Yumei Hardware FAQs

A: We hold the ISO 9001:2015 certification and adhere to IATF 16949 standards for our automotive manufacturing processes. Additionally, we provide material certifications and ensure full traceability for all components, guaranteeing transparency and quality throughout production.

A: We strictly adhere to the ISO 9001:2015, ISO 14001:2015, and IATF 16949:2016 standards, and provide complete material certifications to ensure the quality of every batch of components.
Our Quality Management System:
QC:Quality control mainly focuses on controlling product quality, especially for process control,it can typically be divided into IQC, IPQC, FQC, and OQC.
QA:Quality assurance primarily provides assurance about quality to customers and management, focusing on system management, internal and external audits.
QE:Quality engineering mainly focuses on providing technical support for quality management activities, such as DAS data analysis, reliability testing, setting up inspection procedures, developing inspection/operation instructions (SIP), and analyzing defective or failed products.
Our quality inspections include CMM testing, coating thickness testing, film thickness testing, surface roughness testing, hardness testing, projector testing, and salt spray testing.

A: Our samples can be done within 1 day as soon as we have raw material in stock and there is no surface treatment for the part,3-5 days is our normal time for the samples,regarding the mass production time,it depends on the order quantity,normally 7-15 days.

A: Include aluminum alloys, titanium alloys, stainless steel, engineering plastics, etc. All materials come with traceable certification documents, such as material reports and RoHS/REACH compliance certificates.

CNC Machining Resources

We provide comprehensive precision machining services including Mill-Turn Machining, CNC Turning, CNC Milling, and Swiss screw machining for complex and high-accuracy components. By combining flexible CNC Turning for cylindrical parts, efficient CNC Milling for prismatic and multi-surface features, and high-volume Swiss screw machining for small, tight-tolerance parts, we can support both prototypes and mass production for automotive, aerospace, electronics, medical and other industries.
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