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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 Gear and Helical Gear Manufacturer - Yieh Chen

Based in Taiwan, Yieh Chen Machinery Co., Ltd. is a spur gear and helical gear 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.

Company Profile

Total solution for thread rolling, spline rolling, chipless process and precision gears manufacturer.

An ISO 9001 & AS9100 Certified Manufacturer of Gears.
An ISO 9001 & AS9100 Certified Manufacturer of Gears.
Gear Specialized

Yieh Chen Machinery Co., Ltd is the affiliate of Six Star Group. Six Star was founded in 1975 by Six brothers and devoted to the manufacturing of precision gear products. Throughout these years, Six Star has become one of the Top Five gear manufacturers in Taiwan. With a focus on precision gears and gearboxes, Six Star offers a broad range of industries, including machine tools, aerospace, agriculture machinery, robotic arms, transmission, hydraulic pumps and industrial machines.

Machine Manufacturer

Based on Six Star's professional and rich experience of manufacturing various precise gears, Yieh Chen Machinery was established in 1984 into the market of machinery industry and is dedicated to produce Thread rolling machine and Spline rolling machine with high quality and durable lifetime.

We offer customer rigid machine with function of precision, durable, simple operation, easy maintenance and competitive price. Moreover, we design fully automation production lines for thread rolling machine, wire forming machine, special purpose machine, entire automation production lines are all in our service areas in order to provide total solution for customers.

Yieh Chen is never slackening off on pursuing being the best in the global market. Hence, We wish to achieve higher customer satisfaction and build closer relationship with customers by advancing our quality level.

2018Yieh Chen Machinery Co., Ltd achieve AS9100 D upgrade certificate (Precision Gear Manufacturing).
2017Yieh Chen Machinery Co., Ltd achieve AS9100 certification (Precision Gear Manufacturing).
2014Six Star Machinery Industry Co., Ltd (Taichung Plant) achive AS 9100 Aerospace Quality System Certificate
2013New factory at Taiching Technical Machinery Park completed.
2010Developing gears for solar tracking system.
2006Start officially cooperation with Aerospace orders.
1996Chin-Fa Automatic Machinery Co., Ltd (China Branch).
1995ISO 9002 certification.
1992Rollform Tools Co., Ltd. (UK Branch).
1989Six Star Group Founded (Currently with more than 7 business units).
1989Summoon Co., Ltd. (Thailand Branch).
1988Allstar Precision Machinery Co., Ltd founded.
1984Yieh Chen Machinery Co., Ltd. (Machinery Department) founded in Taiwan.
1975Six Star Machinery Industry Co Ltd founded by Six Brothers in Taiwan.
1960Six Star Gears Co Ltd.

Management Philosophy

  • Give Organization Vitality
  • Give Systems Life
  • Give Company Development
  • Give Customers Satisfaction
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An ISO 9001 & AS9100 Certified Manufacturer of Gears.