banner-index01-20260725
banner-index02-20260725
banner-index03-20260725
IATF16949 Certified Factory Direct CNC Mass Production

Custom Precision CNC Machining & Metal Enclosure OEM Manufacturer

We support prototype verification to stable mass production for automotive hardware, 3C audio equipment, drone structural frames and AI liquid cooling shells.
Our in-house workshop completes 5-axis milling, turning processing and full surface treatment with strict full dimensional inspection.
Our integrated production system resolves multi-supplier management troubles, delivers consistent ±0.01mm tolerance, and effectively controls your overall procurement cost & project lead time.

✓Free DFM Drawing Review ✓ Prototype to Mass Production ✓ Global Delivery Support ✓ Full In-house QC Inspection
23+ Years Experience Mature bulk OEM processes
200+ CNC Machines Support urgent batch shipments
±0.01mm Tolerance Satisfy automotive & industrial precision needs
24H Quotation Response Cut time zone waiting costs
Trusted OEM Partner for Well-Known Global Brands:
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: Luxshare Precision Industry Co.,Ltd., Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: James B. Lansing Sound, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: LONGJOIN, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: klipsch, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: NIO, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: Dajiang Innovation, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: BYD, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: Audioengine, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: xiaomi, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand: Amphenol, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand:GWM, Incorporated, global automotive electronics partner logo
Rejin CNC trusted CNC machined OEM parts manufacturer, cooperative brand:GEELY, Incorporated, global automotive electronics partner logo

Rejin CNC Delivers End-to-End Manufacturing Solutions

Headquartered in Dongguan, Guangdong Province, Rejin CNC manages fully self-owned production workshops backed by qualified, vetted partner resources across China. We deliver integrated precision manufacturing services centered on CNC machining and sheet metal fabrication. We accommodate the full lifecycle of your projects, covering rapid prototyping, low-volume trial manufacturing and stable large-batch mass production. As your dependable long-term OEM manufacturing partner, we produce sophisticated custom structural components with guaranteed high precision, controlled lead times and consistent product reliability for global buyers.

Precision Custom Machining for Complex Structural Parts & Enclosures

Precision CNC Parts for Multi-Industry OEM Manufacturing

Rejin CNC manufactures tight-tolerance CNC machined housings and structural components for four high-growth industries. Our IATF16949-compliant machining processes meet strict quality standards for automotive electronics, professional audio hardware, drone frames and AI liquid cooling heat sinks to support stable large-volume commercial mass production.

3C Electronics Accessories

3C Electronics Accessories

Covers computers, communication devices, and consumer electronics, focusing on smart terminals, AI devices, and eco-friendly products. Precisely sized, easy to install, and cost-efficient, providing stable structural support for various digital devices.
Automotive Parts

Automotive Parts

Covers engine systems and chassis components, made from high-strength metals and rigorously quality-checked for durability and wear resistance. Precisely engineered to fit critical automotive applications, ensuring reliable performance.
CNC Precision Parts & Fasteners

CNC Precision Parts & Fasteners

High-quality metal substrates are precisely processed and rigorously quality-controlled to form a complete range of products including screws, nuts, bolts, washers, etc. They possess excellent properties such as high strength, wear resistance, and corrosion resistance.
Electroacoustic Components & Parts Manufacturing

Electroacoustic Components & Parts Manufacturing

We specialize in CNC precision machining for electroacoustic components and metal parts, including speaker structural parts, microphone housings, audio connectors, and custom functional components. Using CNC turning and milling combined with surface treatments such as anodizing, sandblasting, and polishing, we deliver reliable and production-ready metal parts for electroacoustic applications.
Audio & Visual Electronics Industry

Audio & Visual Electronics Industry

Specializing in core metal components in the electroacoustic field, including audio control panels, audio enclosures, fixed brackets and other customized products. The size tolerance is strictly controlled, and the installation fit is high. This ensures a stable operation.
Aerospace & UAV Components

Aerospace & UAV Components

We manufacture precision CNC machined metal parts for aerospace and UAV applications, including structural components, brackets, connectors, and custom functional parts. With proven experience in lightweight design, high-strength materials, and complex CNC machining, we ensure reliable performance in demanding operating environments.
Medical Devices & Equipment Manufacturing

Medical Devices & Equipment Manufacturing

We offer CNC precision machining for medical device metal parts, including housings, structural components, connectors, and customized medical components. With strict process control and quality management, we ensure dimensional consistency and reliable performance for medical equipment manufacturing.
Robotics Components Manufacturing

Robotics Components Manufacturing

We provide custom CNC machining for robotics components, including joint parts, shafts, connectors, and structural functional components. With high-precision machining and stable production capability, we support robotic systems requiring accuracy, strength, and long-term reliability.
Custom CNC Product Showcase

High Precision CNC Machined Components & Enclosures

benefits-v1
what We Do

Rejin CNC One-Stop Precision Machining Services

We establish standardized full-process production workflows for mass OEM orders. With in-house anodizing, sandblasting and complete surface treatment production lines, paired with a full-lifecycle quality monitoring system, we effectively cut the risks arising from multi-supplier coordination. We deliver consistent long-term batch supply for audio housings, control panels, industrial enclosures and all types of precision metal components.

CNC Turning

CNC Turning

CNC turning is a machining process where the workpiece rotates while a fixed cutting tool removes material. Think of it as an “advanced pottery lathe”: the spindle spins the workpiece at high speed while the cutting tool follows a programmed path to shape it. Ideal for shaft and rotational parts.       CNC turning has become a mainstream process in precision hardware machining due to four core advantages: ① High precision and repeatability, as program control guarantees highly consistent specifications for batch – produced parts; ② High – efficiency integration, modern CNC lathes are equipped with automatic tool changers and live tool turrets, which can integrate operations like drilling, milling, and tapping to shorten delivery time; ③ Wide material adaptability, capable of processing various metals such as stainless steel, aluminum alloy, titanium alloy, copper, as well as engineering plastics; ④ Flexible adaptability, suitable for both small – batch prototyping and large – volume foreign trade orders, widely applied in manufacturing precision parts for industries including automotive, aerospace, medical, and electronics. CNC turning is a subtractive manufacturing process. Its core lies in using computer – programmed cutting tools to precisely machine a high – speed rotating workpiece for material removal. The workpiece is clamped in a chuck and rotated at high speed, while the cutting tool feeds along paths such as the X and Z axes. It can finish multiple operations like external turning, boring, facing, threading, and grooving in a single setup. Unlike conventional lathes, it achieves automated machining via digital programming, with tolerances reaching ±0.005–0.01mm, suitable for batch and custom production of various rotational hardware parts including shafts and disks.

CNC Milling

CNC Milling

Precision cutting of metal or plastic with rotating tools, ideal for flat and complex-shaped parts.     CNC milling has become one of the preferred processes for precision machining in various industries due to multiple advantages: First, high precision and repeatability. Computer program control greatly reduces human errors and ensures high uniformity of specifications for each batch of parts; second, high efficiency and automation. Equipment equipped with an automatic tool changer (ATC) can continuously complete multiple processes without frequent manual intervention, significantly improving production efficiency; third, strong processing flexibility, which can adapt to diverse processing needs from simple planes to complex 3D curved surfaces, especially good at manufacturing special-shaped structures; fourth, wide material compatibility, which can process various metals such as stainless steel, aluminum alloy, titanium alloy, and copper, as well as engineering plastics such as ABS and polycarbonate, and carbon fiber composite materials. It can efficiently adapt to needs whether it is small-batch custom prototyping or large-batch mass production. According to the machine tool structure and the number of axes, CNC milling is mainly divided into three-axis, four-axis and five-axis milling: three-axis milling is suitable for the processing of simple planes and three-dimensional structures, with convenient operation and controllable cost; four-axis milling adds a rotating axis, which can process parts with inclined surfaces; five-axis milling can realize multi-directional linkage processing, accurately complete the integrated manufacturing of complex curved surfaces and special-shaped parts, and is the core equipment in high-end fields such as aerospace. Its application scenarios widely cover aerospace, automobile manufacturing, mold processing, medical equipment, electronic industry, etc. Typical processed parts include UAV connectors, auto parts, mold cavities, precision components of medical devices, electronic product casings, etc., providing key support for the R&D and production of core products in various industries.

5-Axis CNC Machining

5-Axis CNC Machining

5-axis CNC machining is an advanced form of milling that represents the highest level of precision and complexity. As the name suggests, it adds two rotational axes (typically A and C) to the standard three linear axes (X, Y, Z). Ideal for machining parts with complex geometries.     With its unique technical advantages, 5-axis CNC machining is widely used in core high-end manufacturing fields such as aerospace, medical equipment, automotive manufacturing, and high-end molds: In the aerospace field, it is used to process complex curved surface parts such as aircraft engine blades and spacecraft structural parts, meeting the high-precision processing needs of difficult-to-process materials such as titanium alloy; In the medical equipment field, it produces implants such as artificial joints and dental implants, ensuring biocompatibility and use safety with micron-level precision, complying with the ISO 13485 medical industry certification standard; In the automotive manufacturing field, it adapts to the mass production of new energy vehicle motor housings and transmission special-shaped components, improving product performance and production efficiency; In the high-end mold field, it processes complex cavities and cores of injection molds and die-casting molds, ensuring mold precision and improving the qualified rate of finished products. In addition, it also plays a key role in the processing of turbine components in fields such as wind power and energy equipment. 5-axis CNC machining has become a core supporting technology for high-end manufacturing with four core advantages: First, integrated full-process processing. One-time clamping can complete the processing of multi-faceted and complex structures, which can reduce the number of clamping times by more than 80% compared with traditional 3-axis machining, greatly reducing positioning errors; Second, ultra-high precision and stability. Through real-time optimization of tool posture and multi-axis linkage compensation, micron-level machining accuracy can be achieved, while ensuring the consistency of batch parts and improving the surface finish to below Ra0.8μm; Third, extremely strong processing flexibility. It can accurately process complex components such as impellers, mold cavities, and medical implants that cannot be completed by 3-axis/4-axis machines, adapting to the high-value-added production needs of multi-variety and small-batch; Fourth, significantly improving production efficiency. The processing cycle is shortened by optimizing the cutting path. For example, the processing cycle of new energy vehicle motor housings can be reduced from 120 minutes to 45 minutes, while reducing tool wear and lowering comprehensive production costs.

Sheet Metal Fabrication

Sheet Metal Fabrication

Sheet metal and die technology are the backbone of modern manufacturing. It involves using precisely designed and crafted dies to shape and process metal sheets. Dies, often called the “mother of industry,” directly determine the quality, efficiency, and consistency of the final products.       2.Metal Stamping Metal stamping is a high-efficiency cold-forming processing technology. With the help of punching machines and special molds, pressure is applied to metal sheets, strips or pipes to make them undergo plastic deformation or separation, so as to obtain stamping parts with specific shapes, sizes and properties. No additional heating of metal materials is required during the processing, which features fast forming speed and stable precision. According to the process types, it can be divided into separation processes (such as shearing, blanking, punching) and forming processes (such as bending, drawing, flanging). It is widely used in the production of large-batch standardized metal components and is a core basic process in industries such as automobile, electronics and home appliances. 1.Sheet metal processing Sheet metal processing has become a mainstream process in the hardware manufacturing field with four major advantages: First, high forming efficiency. Batch stamping forming can be realized through molds, which is suitable for large-scale production of standardized components and greatly reduces the unit cost; Second, strong design flexibility. It can customize complex special-shaped structures according to customer needs, and there is no need to adjust core production equipment when modifying design schemes, adapting to small-batch customized orders; Third, high material utilization rate. Computer-aided nesting technology is adopted to optimize cutting paths, reduce sheet waste, and the material utilization rate can reach more than 90%; Fourth, adapting to multi-industry needs. The processed components have both lightweight and structural strength, and their corrosion resistance can be improved through surface treatments such as spraying and electroplating, meeting the application requirements of automobiles, electronics, communications, medical equipment and other fields.

Surface Treatments

Surface Treatments

To enhance the appearance, durability, and functionality of metal parts, we offer a variety of advanced surface treatment technologies.     1.First Article Inspection (FAI) Following a strict inspection process, FAI verifies whether production processes, tooling, and equipment can consistently produce conforming parts. It aims to detect and correct deviations early, preventing batch defects and ensuring product consistency. 2.Polishing Services Polishing uses physical or chemical methods to remove minor surface imperfections, creating a smooth, mirror-like finish. It enhances visual quality and gloss while reducing surface defects, providing an ideal base for subsequent treatments such as plating or anodizing. 3.Sandblasting Services Sandblasting uses high-speed abrasive jets to clean and roughen metal surfaces. It removes all contaminants and creates a uniform texture, greatly improving adhesion for subsequent coatings such as painting or plating, while also relieving stress and strengthening the surface. 4.Spray Painting Service High-precision metal painting with even coating, corrosion-resistant and durable, available in multiple colors for CNC parts, hardware, and metal housings. 5.Electroplating service High-precision electroplating creates an even metal layer on surfaces, enhancing corrosion resistance and appearance. Suitable for hardware, CNC parts, metal housings, and industrial components, with various metal finishes available. 6.Powder coating Service High-precision powder coating uses electrostatic spraying to apply dry powder on parts, then cures it at high temperature to form a durable, dense coating. Corrosion-resistant, scratch-resistant, colorful, and eco-friendly. 7.Silk Screening Silk screening is a reliable method for applying logos, text, and decorative patterns. From plastic housings to metal panels, it creates durable, clear, and wear-resistant markings that remain intact during everyday use. 8.Laser Engraving Laser engraving uses a high-energy laser beam to precisely mark surfaces in a digital process. It provides high-precision, permanent markings on most materials, featuring a non-contact, consumable-free, and highly efficient operation.

How To Order Custom CNC Parts

About Us

Rejin CNC

We are a professional Dongguan factory focusing on precision CNC machining & metal enclosure mass OEM production for global industrial buyers.
Supported by standardized production lines, IATF16949 quality management system and full in-house surface treatment processes, we steadily control product tolerance within ±0.01mm for long-term bulk orders.
Our mature technical team provides one-stop services from drawing DFM optimization, sample trial production to mass delivery, effectively cutting your supply chain costs and avoiding quality instability caused by outsourced processing.

Client Testimonials

Authentic Reviews & Feedback From Global OEM Clients

handheld-fidget-toy-close-up
"I shared only an early concept, and they quickly turned it into a practical machining solution. The surface finishing is clean and consistent, and the final parts look even better than what we had in mind."
Elena M. – Product Designer, UK

Elena M.

Product Designer, UK
CNC Precision Machined Shaft
"The medical industry requires absolute consistency, and their QC process gave us confidence from day one. Every batch came with complete inspection reports, and the stability of their output has been excellent."
Kevin S. – Technical Supervisor,CA.

Kevin S.

Technical Supervisor,CA.
CNC-Machined Earphone shell
"They supported us through prototyping and small-batch production, offering valuable suggestions on machining and finishing. The parts arrived with great precision, and we have since moved to volume production with them."
Marco L. – Founder, Italy

Marco L.

Founder, Italy
Order Packaging in Progress
"Fast response, competitive pricing, and detailed technical feedback. They're very capable when it comes to multi-SKU orders and flexible production schedules. Working with them has been smooth and efficient."
Sarah P. – Purchasing Manager, Canada

Sarah P.

Purchasing Manager, Canada

Where Quality & Reliability Converge in Custom Manufacturing

At Rejin CNC, strict quality control runs through the whole manufacturing workflow. Our professional QA team carries out full-process rigorous inspections from pre-production verification to finished goods delivery, boosting your first-pass yield and stable batch consistency.
Backed by IATF16949 and ISO standard management systems, we keep stable ±0.01mm precision for CNC machined housings and structural parts during prototyping and mass production, delivering reliable custom manufacturing services for your long-term orders.

  • Advanced Inspection & Measurement

    We deploy a full set of precision testing equipment including CMMs, optical measuring instruments and material analyzers to strictly inspect dimensional accuracy, material property stability and surface treatment quality of finished CNC parts.
  • Detailed Inspection Documentation

    We provide complete inspection archives covering FAIR reports, material certificates, dimensional test data and compliance files, supporting full product traceability and stable quality assurance for your batch orders.
  • Certified Manufacturing Excellence

    Equipped with ISO 9001, ISO 13485 and IATF 16949 authoritative certifications, we have long-term quality recognition from mainstream automotive, electronics and audio hardware brands to satisfy strict industrial quality standards.
  • Dedicated Quality Engineering

    Our professional quality control team tracks the whole process from drawing evaluation to mass production. We execute standardized process management and iterative optimization to effectively curb defective products and keep all products fully compliant with customer specifications.
Rejin CNC Technology - Dongguan Precision CNC OEM Factory
Rejin CNC Technology - Dongguan Precision CNC OEM Factory
Rejin CNC Technology - Dongguan Precision CNC OEM Factory
Rejin CNC Technology - Dongguan Precision CNC OEM Factory
FREQUENTLY ASKED QUESTIONS

Rejin CNC FAQs

For any questions on custom CNC fabrication, quote evaluation and manufacturing cooperation, please contact us anytime. Our dedicated team delivers timely responses for all your demands.

How do we ensure my design is ready for reliable manufacturing?

Every successful product starts with a manufacturability check. Upload your CAD file to instantly receive automated DFM analysis on key factors like geometry, tolerances, and wall thickness. For critical projects, our engineers perform a detailed manual review within one business day, providing clear, actionable recommendations on design adjustments, materials, and processes to ensure quality and avoid delays.

What sets Rejin CNC apart from other suppliers or platforms?

We combine in-house manufacturing with a vetted partner network under strict quality standards. Unlike intermediaries, we provide integrated engineering support, from prototyping to full-scale production and packaging. With dedicated project management and a focus on industries like automotive, medical, and electronics, we ensure reliability, consistency, and seamless scale-up for every order.

How fast can you deliver my parts?

Lead time is determined by part complexity, production volume and required manufacturing processes.
Rapid CNC & 3D printed prototypes can be delivered within 2–5 working days.
Small-batch serial production generally takes 2–4 weeks.
Send us your design drawings and specifications, and we will provide you with an accurate quotation together with a definitive delivery schedule.

How does the quotation process work at Rejin CNC?

We provide instant online quotes for standard manufacturing services. Simply upload your 2D or 3D files and select your preferred process, material, finish, and quantity. If your project is more complex, a dedicated engineer will reach out within one business day to review your requirements and prepare a customized proposal.

Can you support design changes or modifications after production starts?

Yes, we accommodate engineering change requests wherever possible. Minor adjustments during the prototyping stage are generally straightforward, while changes during mass production may affect cost and lead time. Our team will provide a clear impact assessment and assist you in implementing changes with minimal disruption.

What are your accepted file formats for quoting and production?

We support common 2D and 3D formats, including STEP, STL, IGES, X_T, DWG, and PDF. For best results, please upload complete, dimensioned drawings and specify critical tolerances, surface finishes, and material preferences in your notes.

Is there a minimum order quantity (MOQ)?

For prototyping and low-volume orders, we offer no MOQ so you can order as few as one part. For injection molding and large-scale production, MOQ depends on the tooling and process—our team will provide a detailed breakdown during quoting.

What quality certifications do you hold?

We are ISO 9001:2015 certified and comply with industry-specific standards such as IATF 16949 (automotive) etc. We can also provide material certifications, FAIRs, and third-party inspection reports upon request.

CNC Machining Latest Updates

Explore Our CNC Machining Technical Blog

View More
How to Achieve ±0.01mm Tolerances in Precision CNC Machining
24 , July

How to Achieve ±0.01mm Tolerances in Precision CNC Machining

Master ±0.01mm tolerances with our expert CNC machining guide. Learn how thermal control, rigidity, and CMM verification ensure micron-level accuracy.
Designing CNC Parts for High-Performance Industrial Robotics
23 , July

Designing CNC Parts for High-Performance Industrial Robotics

Rejin CNC delivers high-precision, production-grade robotics components. Optimize joint mass & durability with our 5-axis CNC machining services.
Why CNC Aluminum Parts is the Perfect Match for Heavy E-MTBs
17 , July

Why CNC Aluminum Parts is the Perfect Match for Heavy E-MTBs

Discover why high-torque E-MTBs require heavy-duty CNC aluminum parts. Learn how multi-axis machining beats die casting in durability and weight targets.

Get in touch

    Your Name

    Email *

    Tel Number

    WhatsApp

    Describe your message

    File upload

    File preview

    There is no file for now. Please select a file for preview


     
    Products
    Contacts
    WhatsApp
    Email