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About Us
Home> About Us

What We Do

SJ-MFG is located in Shenzhen. We specialize in customized precision CNC machining, sheet metal fabrication, gear processing, and rapid prototyping manufacturing. We provide services to industries such as aerospace, automotive, medical, and home appliances, and have accumulated a large amount of production and manufacturing experience. From rapid prototyping (MOQ1) to low volume and mass production, we can offer flexible, cost-effective manufacturing solutions to meet the diverse customization OEM/ODM requirements of our customers. Our experienced engineering team can offer quick quotations and competitive prices. The seasoned sales team can communicate directly and promptly with customers in English, providing detailed project information and requirements to the clients within 12 hours. The professional and reliable production team will produce your project quickly and efficiently, ensuring that each project is completed with high quality and on time. Strict quality control is of vital importance. SJ-MFG ensures that each order will undergo professional QC for strict detection of size tolerances, and can provide material, quality inspection and surface treatment reports according to the client's requirements. Our goal is to establish a long-term, stable and mutually beneficial partnership with our customers, offering competitive prices, high-quality parts and timely deliveries. We help our customers turn designs into products and enjoy a smooth and satisfactory manufacturing process. Let's get started!

Shenzhen SJ Precision Products CO.,LTD

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Our Factory

Our Team

Jim Zeng

Jim Zeng

Project Manager

As the project manager of the company, with over 9 years of experience in CNC custom machining industry, I am capable of independently handling various customized processing project requirements from clients. I have numerous clients from different countries and can respond to their various needs in a professional and timely manner, and provide appropriate solutions.

Janice Lee

Janice Lee

Operation Manager

As the operations manager of the company, I have been working at SJ-MFG for over 8 years, responsible for arranging, coordinating and following up on customer orders for production. This includes tasks such as material procurement, CNC processing, and after-sales services. I am able to respond promptly and provide feedback.

Daniel Hu

Daniel Hu

Engineer Manager

As the engineering manager of the company and a mechanical engineer with 21 years of experience in CNC machining, I am well-versed in all the materials and surface treatment technologies used in CNC processing. I can offer competitive and advantageous prices for the various customized processing projects of our clients at an extremely high professional level.

Jessie Feng

Jessie Feng

QC Manager

As the QC manager of the company, I strictly adhere to the quality inspection management procedures and requirements. Before the products are delivered to the customers, I ensure that the quality and dimensions are correct, thus guaranteeing that we provide customers with satisfactory and qualified high-quality products.

Combination of rigorousness, reliability and professionalism in quality inspection

The inspection team of SJ-MFG consists of over 9 quality engineers, we skillfully use a variety of inspection instruments, such as CMM (Coordinate Measuring Machine), 2.5D measuring instruments, roughness tester, hardness tester, height gauges, anodizing layer thickness tester, thread gauge sets, micrometers, and digital calipers, to check the dimensions of CNC parts, thread dimensions, material performance and surface finish data. We can provide detailed 2D size inspection reports, first article inspection (FAI), RoHS certificates, and assembly functional test results according to customer requirements, to support your quality management. We strictly follow the ISO quality certification management process to ensure the professional and rigorous quality inspection of machining, providing strong support for quality assurance.

2.5D Measuring Instrument
2.5D Measuring Instrument
2.5D Measuring Instrument

Height Gauge
Height Gauge
Height Gauge

CMM
CMM
CMM

Anodizing Layer Thickness Tester
Anodizing Layer Thickness Tester
Anodizing Layer Thickness Tester

Roughness Tester
Roughness Tester
Roughness Tester

Thread Gauge
Thread Gauge
Thread Gauge

Hardness Tester
Hardness Tester
Hardness Tester

Quality Control Procedures.

SJ-MFG adheres to a strict quality inspection process to ensure the precision and consistency of the manufactured parts.

  • Step01

    Pre-production

    Before the production begins, our engineering team will evaluate your part design. This includes aspects such as surface finish, structure, process, and other details of the drawings.

  • Step02

    In-production

    In precision processing, a on-site inspection system is maintained. The quality control team conducts size tolerance checks on all the parts being produced every hour.

  • Step03

    Final-production

    For all completed orders, we can provide complete size inspection reports, material reports, hardness tests, RoHS certifications, etc. as per your requirements.

  • Step04

    Packaging

    Ensuring that the parts we manufacture are of the highest quality is important. Four layers of protection: 1. wrapping paper 2. EPE 3. foam 4. paper/wooden box are applied during the packaging process, ensuring that we deliver the most high-quality and beautiful parts to you.

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