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Yieh Chen Machinery Co., Ltd., an affiliate of Six Star Group, is an ISO9001 & AS9100 certified manufacturer specializing in precision gear transmission components and advanced chipless forming machinery since 1984.
Founded in 1984, Yieh Chen Machinery has been a trusted name in the machinery industry, dedicated to manufacturing high-quality Thread Rolling Machines and Spline Rolling Machines with exceptional durability and performance.
As part of the Six Star Group—established in 1975 by six brothers—the company has deep roots in precision gear manufacturing. This heritage drives our commitment to innovation, quality, and customer satisfaction.
We are proud to be certified under ISO 9001 and AS9100 (Aerospace Industry), reflecting our rigorous quality assurance standards and global reliability.
Awarded ISO-9001 and AS9100 certifications for consistent quality and aerospace-grade manufacturing standards.
Committed to building long-term relationships through superior service, reliability, and technical excellence.
All gears and components can be customized with innovative solutions tailored to your specific needs.
From high-performance thread rolling machines to precision gear components, we offer a comprehensive range of industrial solutions designed for efficiency, durability, and accuracy.
Equipped with automatic bar loading and unloading system for high-efficiency production lines.
Our most powerful model with over 120 tons of rolling pressure for demanding applications.
Precision-engineered hydraulic system ensures consistent thread forming with minimal wear.
Specialized for threading tubes and hollow shafts with high concentricity and finish.
Mechanical cam system for precise, repeatable thread rolling in high-volume environments.
Designed for cold-forming external splines with high accuracy and surface integrity.
Tailored dies for thread and spline rolling machines to meet unique application requirements.
Versatile machine capable of performing multiple cold forming operations in one setup.
Engineered for unique industrial applications requiring custom automation and forming solutions.
Automated material handling system designed to integrate seamlessly with rolling machines.
High-accuracy gear racks for linear motion systems and industrial automation.
Precision-cut bevel gears for power transmission at intersecting axes.
ISO9001 and AS9100 certified manufacturing processes ensure the highest standards in every product we deliver.
Utilizing chipless forming and cold rolling processes for stronger, more durable components with minimal material waste.
Trusted by clients worldwide across aerospace, automotive, industrial machinery, and fastener manufacturing sectors.
1984
Founded
40+
Years of Experience
120+
Tons Max Pressure
ISO9001 & AS9100
Certified Since 2014
Thread rolling is a cold-forming process that creates threads on cylindrical workpieces by pressing hardened dies into the material, resulting in stronger threads with improved surface finish compared to cutting.
Spline rolling increases strength through grain flow orientation, offers high dimensional accuracy, excellent surface finish, and is more efficient than broaching or hobbing.
Yes, all gears including spur, helical, worm, bevel, and gear racks can be customized in terms of module, pressure angle, material, heat treatment, and precision grade to meet your exact specifications.
Yes, we offer auto feeding machines and can design custom automation systems to integrate with our thread and spline rolling machines for fully automated production lines.
Absolutely. Our AS9100 certification ensures that our machines and components meet the stringent quality and traceability requirements of the aerospace industry.
Have any questions or need a business consultation? We're here to help you find the right solution.
Yieh Chen Machinery Co., Ltd.
No.112, Baosheng Rd., Changhua City, Changhua County 50089, Taiwan
Phone: 886-4-7221234
Fax: 886-4-7265265
Email: sales@yiehchen.com
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