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Total Solution for Thread Rolling & Spline Rolling

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.

About Yieh Chen Machinery

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.

Excellent Quality

Awarded ISO-9001 and AS9100 certifications for consistent quality and aerospace-grade manufacturing standards.

Trusted Vendor

Committed to building long-term relationships through superior service, reliability, and technical excellence.

Professional Customization

All gears and components can be customized with innovative solutions tailored to your specific needs.

Our Products

From high-performance thread rolling machines to precision gear components, we offer a comprehensive range of industrial solutions designed for efficiency, durability, and accuracy.

Automatic Thread Rolling Series Machine

Automatic Thread Rolling Series Machine

Equipped with automatic bar loading and unloading system for high-efficiency production lines.

  • • High-speed operation
  • • Integrated automation
  • • Ideal for mass production
Heavy Duty Thread Rolling Machine

Heavy Duty Thread Rolling Machine

Our most powerful model with over 120 tons of rolling pressure for demanding applications.

  • • Over 120-ton rolling force
  • • Robust hydraulic system
  • • Suitable for large-diameter threads
Hydraulic Thread Rolling Machine

Hydraulic Thread Rolling Machine

Precision-engineered hydraulic system ensures consistent thread forming with minimal wear.

  • • Stable pressure control
  • • Low maintenance design
  • • Long service life
3 Roll (For Tube) Thread Rolling Machine

3 Roll (For Tube) Thread Rolling Machine

Specialized for threading tubes and hollow shafts with high concentricity and finish.

  • • 3-roll synchronized system
  • • Ideal for pipe and tube industries
  • • High repeatability
Cam Driven Thread Rolling Machine

Cam Driven Thread Rolling Machine

Mechanical cam system for precise, repeatable thread rolling in high-volume environments.

  • • Mechanical precision
  • • Low energy consumption
  • • Durable cam mechanism
Spline Rolling Machine

Spline Rolling Machine

Designed for cold-forming external splines with high accuracy and surface integrity.

  • • Cold forming process
  • • High dimensional accuracy
  • • Suitable for automotive and aerospace
Customized Rolling Dies Image

Standard / Special / Customized Rolling Dies

Tailored dies for thread and spline rolling machines to meet unique application requirements.

  • • Custom profiles available
  • • High wear resistance
  • • Precision ground surfaces
Multi Forming Machine Image

Multi Forming Machine

Versatile machine capable of performing multiple cold forming operations in one setup.

  • • Multi-process integration
  • • Reduces secondary operations
  • • Increases productivity
Special Purpose Machine Image

Special Purpose Machine

Engineered for unique industrial applications requiring custom automation and forming solutions.

  • • Fully customizable
  • • Turnkey solutions
  • • Expert engineering support
Auto Feeding Machine Image

Auto Feeding Machine

Automated material handling system designed to integrate seamlessly with rolling machines.

  • • Increases uptime
  • • Reduces labor cost
  • • Compatible with various bar sizes
Precision Spur/Helical Gear Rack

Precision Spur / Helical Gear Rack

High-accuracy gear racks for linear motion systems and industrial automation.

  • • Ground tooth profiles
  • • High load capacity
  • • Custom lengths and modules
Bevel / Spiral Bevel Gear

Bevel / Spiral Bevel Gear

Precision-cut bevel gears for power transmission at intersecting axes.

  • • High torque transmission
  • • Low noise operation
  • • Aerospace and automotive grade

Why Choose Yieh Chen?

Certified Quality

ISO9001 and AS9100 certified manufacturing processes ensure the highest standards in every product we deliver.

Advanced Technology

Utilizing chipless forming and cold rolling processes for stronger, more durable components with minimal material waste.

Global Trust

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

Frequently Asked Questions

What is thread rolling?

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.

What are the advantages of spline rolling?

Spline rolling increases strength through grain flow orientation, offers high dimensional accuracy, excellent surface finish, and is more efficient than broaching or hobbing.

Can you customize gears?

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.

Do you provide automation integration?

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.

Are your machines suitable for aerospace applications?

Absolutely. Our AS9100 certification ensures that our machines and components meet the stringent quality and traceability requirements of the aerospace industry.

Get in Touch

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

Visit Official Website to Contact

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