## **Daido Precision Industries Ltd. – Company & Product Overview**
**Daido Precision Industries Ltd.** (DPI), formerly known as Tokushu Seiko, is a member of the Daido Steel Group. Founded in 1933 as a special steel toolmaker and incorporated in 1948, the company is a specialized manufacturer of high-function precision components, including turbocharger parts, compressor elements, disc spring products, and power transmission couplings. DPI plays a critical role in the automotive and industrial machinery industries, offering vertically integrated production from material selection to final assembly.
### **Company Profile**
* **Company Name:** Daido Precision Industries Ltd. (DPI)
* **Founded:** 1933 (incorporated in 1948)
* **Headquarters:** Tokyo/Saitama region, Japan
* **Parent Company:** Daido Steel Co., Ltd.
* **Capital:** ¥90 million
* **Employees:** Approximately 211 (as of April 2025)
* **Certifications:** IATF 16949, ISO 9001, ISO 14001
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## **Business Scope**
DPI operates in two core divisions:
1. **Parts Division:** High-precision parts for automotive systems such as turbochargers and for industrial machinery including high-speed compressors and vibration-resistant mechanisms.
2. **Coupling Division:** Design and manufacture of power transmission couplings including the proprietary flexible-disc FORMFLEX® series and micro-coupling solutions. DPI was the first company in Japan to implement metal disc spring coupling technology.
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## **Product Portfolio & Notable Models**
### **A. Precision Components for Automotive and Industry**
* **Turbocharger Components:** Machined vanes, oil seals, housings, and other parts optimized for thermal and rotational stress.
* **Compressor & Disc Spring Components:** Designed for high-temperature, high-load, and vibration-intensive operations.
* **Vibration Control & Magnet Assemblies:** Used in both automotive and construction industries for damping, actuation, and stability enhancement.
### **B. Couplings and Transmission Solutions**
#### **FORMFLEX® Couplings (Disc-Spring Type)**
* Proprietary flexible-disc couplings offering high torque capacity, precision alignment, and resistance to misalignment or vibration. Ideal for use in pumps, blowers, and compressors.
#### **Micro Couplings**
* Compact couplings designed for micromachinery, including applications requiring electrical insulation and precise motion control.
#### **TORSIFLEX® Couplings**
* Heavy-duty disc couplings engineered for high torque and torsional rigidity. Suitable for large-scale industrial equipment.
#### **Stieber-Type Clutches**
* Specialized torque-limiting and backstop clutches, often integrated into coupling assemblies for power management and mechanical safety.
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## **Technical Capabilities & Key Advantages**
### **1. Vertically Integrated Manufacturing**
From steel processing and cutting to grinding, heat treatment, surface finishing, and final assembly, all production stages are handled in-house under strict quality control.
### **2. Pioneering Coupling Technology**
DPI was the first in Japan to introduce disc-spring couplings, and has since led in developing precision coupling products tailored for dynamic, high-load applications.
### **3. Certified Quality and Environmental Management**
The company holds IATF 16949 certification for automotive manufacturing, ISO 9001 for quality management, and ISO 14001 for environmental stewardship.
### **4. Reliable Across Industries**
DPI's products are trusted in key applications such as automotive turbochargers, heavy-duty compressors, industrial machinery, seismic vibration controls, and power transmission systems.
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## **Product Range Overview**
| Business Area | Product Type | Applications |
| ------------------ | -------------------------------------------------------- | ---------------------------------------------- |
| Precision Parts | Turbocharger parts, compressor components, disc springs | Thermal stress and high-speed rotating systems |
| Coupling Solutions | FORMFLEX®, Micro Couplings, TORSIFLEX®, Stieber clutches | Power transmission, vibration reduction |
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## **Conclusion**
**Daido Precision Industries Ltd.** is a world-class manufacturer of specialized mechanical components for demanding industries such as automotive, energy, and heavy machinery. Their broad product offering—ranging from turbocharger assemblies to industry-leading coupling technologies—is supported by vertically integrated manufacturing and rigorous quality assurance systems. With nearly a century of innovation, DPI combines engineering excellence with sustainability, making it a preferred partner for clients requiring high-performance and reliable mechanical solutions.