Toyooka City, Hyogo | TOHO SEIKO | Design and Production of Precision Springs, Press Tooling Molds, Precision Tools & Jigs and Equipment for Streamlined Machines. We handle springs every day and we are flexible and resilient like “springs”. Ask us anything about springs.



Quality Assurance

《Advanced Measurement Technology and Apparatus》

Spring Characteristic Inspection by Automatic Loading and Torque Testing Machines

External Appearance Microscopic Inspection

Fully automatic measurement and angle inspection by image measurement devices

Measurement and angle inspection by a high-speed digitized projector

《A Balance of Quality and Environment》

QA Process

Spring Design / Specification Examination

Our company has developed our own unique spring-design software that allows us to apply our secret techniques to all projects. This makes it possible to verify the appropriate design and proposals.

Quality Planning

Our group in charge of quality assurance is tasked with making the best plans for quality as well as executing those plans to achieve the goal.

Process Development / Trial Production

We organize a complete process to satisfy customers’ requests and reach the desired quality. The improvement leads to our best quality.

Products Inspection

Our new measurement devices make a highly accurate inspection and examination possible.

Statistical quality control

We check the quality of the products using statistical methods, and if necessary, make improvements.

Standardization/ documentation

We complete documentation of quality plan and clarify the control items.







Toho Seiko is supporting the Onpunosaiten Festival