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Spline Rolling Machine

Spline Rolling Machine

Spline Rolling Machine is inherently accurate, with surface finishes of 3 to 6 micro-inches obtainable by rolling.

Experience Custom Gears

Experience Custom Gears

Founded in 1975 by six brothers, Six Star owns 40 years of experience on manufacturing precision gear products.


Spur Gears Manufacturer - Yieh Chen

Based in Taiwan, Yieh Chen Machinery Co., Ltd. is a spur gear and helical gear | Spur Gears manufacturer with over 31 years of experience in gear industry.

With CNC gear machining, ISO certification and advanced software, Yieh Chen's high precision spur gears and helical gears are built with excellency.

Along with Spur Gears and Helical Gears, worm shafts, spiral bevel gears, bear boxes, gear pumps and gear racks are provided as well. All gears can be custom-made with innovative solutions to meet each customer's demands.

Spur Gears

A complete selection of cylindrical gear products.

Cylinder gears continue to play a key role in the gear world, and they account for more than 60-70% of the gear market (2004, Frost & Sullivan). With 35 years of development experience, Six Star can provide complete cylindrical gear solutions for our customers. Our main manufacturing capacity is shown in the table as follows:

Gear and shaft Capabilities
  • Quality Level
  • (1) DIN 2 Grade
    (2) JIS 0 Grade
    (3) AGMA 15 Grade
  • Manufacture Range
  • Gear: Max. Outside Diameter: 2000mm / Max. Module: 34mm
    Shaft: Max. Outside Diameter: 350mm / Max Length: 1500mm

In addition, the portfolio of cylindrical gears we can provide is quite broad, including external gear, internal gear, spur gear, helical gear, and shafts. We make sure our gears meet our customers' expectations and reach the highest transmission efficiency (99%) and high speed (10000 RPM).

The applications for our cylindrical gears are extensive: machine tools, textile machines, pumps, compressors, healthcare equipment, agriculture machines, printing machines, sawing machines, and so on. We provide custom design and manufacture services for customers and offer a warm and informative welcome to everyone who contacts us.


Sixstar can customize different kinds of gears according to customer's drawing or specific request.


Spur Gear Applications
  • Machine Tools
  • Do you want to offer excellent machine tools to your customers?
    Precise drive systems are vital parts on rotary tables, spindles, ATCs and gear reducers. Since 1975, Six Star has designed and manufactured gear components and gearboxes for drive systems or for the whole machine. We have produced items to be used in a wide range of products, such as milling machines, turning machines, CNC vertical machine centers, CNC horizontal machine centers, heavy-cutting machine centers, drilling machines, and other precision machine tools.
    In addition, Six Star produces spur gears, helical gears, double helical gears, bevel gears, worm and worm gears, and shaft and planetary gearboxes. Today, Six Star can provide precise, low-noise custom products within a range of specifications.

  • Aerospace
  • Six Star has manufactured gears for aerospace applications for more than 20 years. Since 2006, we have provided gears to well-known Aerospace Industry enterprises as a qualified vendor for their aircraft, and is certified by AS9100 quality system in year 2014. Aerospace gears manufactured by Six Star include spur gears, helical gears, worm and worm gears, and splined shafts. These gears can be used in control systems, pumps, planetary gears, landing mechanisms, and other aerospace applications.
    In order to increase cooperation with our aerospace partners, Six Star constructs a new manufacturing plant and headquarters in The Taichung City Precision Machinery Innovation Technology Park. This plant is with 19,140 square meters area and starts running production from 2013. With this expansion, Six Star will be able to offer even better service and shorter production time to our valued customers. The ability to produce diverse gear types in small batches to fit our aerospace partners' needs makes Six Star the ideal manufacturer for gears in the aerospace industry.

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