## **Kyowa Universal Joint (Kyowa Kogyo Co., Ltd.) – Company & Product Overview**
**Kyowa Kogyo Co., Ltd.**, based in Ōbu, Aichi Prefecture, Japan, is a top-tier manufacturer specialized in universal joints (“UJ”) and steering joints. Established decades ago, the company pioneered cold‑forged yoke manufacturing, enabling compact, high‑precision components widely adopted in automotive steering, agricultural machinery, industrial vehicles, and general machinery.
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### **Company Profile**
* **Name:** Kyowa Kogyo Co., Ltd.
* **Core Business:** Design and manufacture of universal joints and steering joints
* **Headquarters:** Ōbu, Aichi Prefecture, Japan
* **Strength:** High rotational accuracy, compactness, and robust cold-forged yoke design, giving superior rigidity and durability
* **Applications:** Automotive steering systems, tractors, rice planters, forklift transmissions, printing machines, conveyors, multi-axis drills, and more
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### **Product Portfolio**
Kyowa produces several series of universal joints tailored to different torque, speed, and application needs:
* **S Series** – High-precision “komagata” type (SC, SD, SP models)
* **N Series** – General-purpose, robust peripherals (NC, ND, NP models)
* **F Series** – Oil-free, maintenance-free small cross type (FJ, FP models)
* **C Series** – Mass-production oil-free small cross type (CF, CD models)
* **K Series** – Industrial propeller shaft types (KD, KP models)
* **H Series** – Cold-forged steering joints (HJ, HD, HP models)
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## **Detailed Series Descriptions & Model Highlights**
### **1. S Series (SC / SD / SP models)**
* **Purpose:** Standard high-precision “komagata” type joints with minimal backlash and excellent torque transmission
* **Bore Range:** 3–50 mm
* **Spindle forms:** SP models include intermediate spline shafts for telescoping in all directions
* **Models:** SC (single-side compact), SD (double for tight spaces), SP (\*\*-00A, \*\*-03A, \*\*-33A, \*\*-08A, \*\*-88A, \*\*-09A)
### **2. N Series (NC / ND / NP models)**
* **Variants:**
* NC: compact, single-side type
* ND: double-type for narrow installations
* NP: with intermediate spline for axial movement
* **Bore Range:** 6–30 mm
* **Features:** Increased clearance for rugged environments, same base dimensions and materials (SCM415 + manganese phosphate treatment) as S Series for increased durability
### **3. F Series (FJ / FP models)**
* **Purpose:** Oil-free, high-speed, maintenance-free general-purpose cross-type joints
* **Bore Range:** 16–40 mm
* **Typical Models:**
* FJ-32, FJ-42, FJ-52, FJ-59, FJ-70 – varying torque and speed parameters
* **Performance Example:** FJ-32 supports up to 5,000 rpm, 29 N·m torque; FJ-70 rated for 3,500 rpm, 340 N·m torque
### **4. C Series (CF / CD models)**
* **Purpose:** Mass-production version of F Series, oil-free and high-speed capable but optimized for volume production
* **CD Model Examples:**
* CD-32, CD-42, CD-52, CD-59 – with consistent 5,000 rpm rating and varying torque ratings from 29–240 N·m
### **5. K Series (KD / KP models)**
* **Purpose:** Heavy-duty propeller shaft couplings designed for industrial vehicles, forklifts, and high-torque mechanisms
* **Features:** Supports high torque, high rotational speed, and large bore sizes; optional matching flanges and custom machining available
### **6. H Series (HJ / HD / HP models)**
* **Purpose:** Cold-forged steering joints offering high rigidity, compact size, and excellent rotational stability
* **Applications:** Automotive steering, tractors, ride-on planters, heavy machinery control systems
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## **Core Technical Strengths**
* **Cold‑Forged Yokes:** Kyowa pioneered cold forging for yokes, enabling fiber flow–inspired rigidity superior to stamped/welded yokes, and toughness exceeding hot‑forged alternatives
* **Ultra‑High Rotational Accuracy:** S and H Series offer minimal backlash and precise motion, essential for steering and multi-axis mechanisms
* **Oil‑Free Operation:** F and C Series achieve high rotational speeds (up to 5,000 rpm) without maintenance lubrication, ideal for clean, high-cycle applications
* **Fully In‑House Production:** Design, forging, machining, assembly, surface treatment, and fatigue testing are conducted internally, ensuring quality control
* **Versatility in Applications:** Products are widely used in automobiles, agricultural machinery, industrial equipment, conveyors, printing systems, and precision drilling setups
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## **Summary Table**
| Series | Model Types | Bore Size Range | Key Strengths |
| -------- | ----------- | --------------- | ------------------------------------------- |
| S Series | SC, SD, SP | 3–50 mm | Ultra-precision, low backlash |
| N Series | NC, ND, NP | 6–30 mm | Durable, rugged, value-priced |
| F Series | FJ\*, FP | 16–40 mm | High-speed oil-free |
| C Series | CD\*, CF | Similar to F | Simplified mass-production variants |
| K Series | KD, KP | Large bores | Heavy-duty, propeller shaft–style torque |
| H Series | HJ, HD, HP | Varies | Cold-forged steering joints, compact, rigid |
(\* indicates specific models like FJ-32, CD-52, etc.)
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## **Conclusion**
Kyowa Kogyo Co., Ltd. is a leading universal joint specialist with decades of expertise in precision cold-forged components. Its S-series offers top-tier rotational accuracy for precision machinery, N-series delivers rugged general-purpose solutions, F and C series provide oil-free high-speed operation, K series supports industrial torque-heavy drives, and H series represents advanced steering joint technology. With fully in-house manufacturing and rigorous quality control, Kyowa products deliver reliable, high-performance coupling solutions for automotive, agricultural, industrial, and precision-engineering applications worldwide.