三井机械厂有限公司是由香港三井机械工业全资拥有，公司始创于1985年，专于高速小型螺丝机械的设计及制造（5mm以下的打头机、搓丝机及锯脚机）。自1985创立以来，三井不断成长，三十多年来深受广大客户的认同及信赖，至今已成为其中一家领导螺丝机械工业公司之一。三井机械厂有限公司位于南安市官桥金桥开发区内，是一座花园式的厂房，厂园面积达20,000平方米以上。

Sam Chang Machinery Co.,Ltd. is wholly owned by Hong Kong Sam Chang Machinery Industrial. The company was founded in 1985 , specializing in high-speed screw machine design and manufacturing (5mm below the heading machine , thread rolling machine and screw end cutting machine). Since its inception in 1985, Sam Chang keeps on growing and gains by the recognition and trust of customers more than two decades, it has become one of the leading screw machine industry companies.Its located in Guan Qiao,Nan An,Fujian and is a garden plant factory with around 20,000 square meters in area.