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!
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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.
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.
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.
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.

Rapid prototyping, small batch production, mass production, delivery within the shortest 2 days. Meeting customers' demands for customized processing services, enabling customers to quickly obtain samples and providing high-quality customized parts to customers.
As long as customers provide drawings, samples, or ideas, we will hold engineering and design analysis meetings to provide customers with one-stop service of constructive and feasible technical support for their R&D design and cost optimization.

Over 100 various processing machines are available, capable of meeting the diverse customization processing needs of customers. Orders from different clients are being delivered every day. On average, over 10,000 various CNC parts are produced each month. This company possesses medium to high production capacity in the CNC processing industry.
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.
SJ-MFG adheres to a strict quality inspection process to ensure the precision and consistency of the manufactured parts.
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.
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.
For all completed orders, we can provide complete size inspection reports, material reports, hardness tests, RoHS certifications, etc. as per your requirements.
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.