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About UJK Brand
UJK is a renowned manufacturer of high-precision mechanical components, specializing in overrunning clutches and one-way bearings. Synonymous with durability, exceptional performance, and rigorous quality standards, UJK bearings are engineered to provide reliable rotation in a vast array of automotive, industrial, and mechanical applications. Our products ensure seamless operation, prevent reverse backlash, and enhance the efficiency and longevity of machinery.
Featured Product Series: CSK & CKA
UJK's CSK and CKA series are among our most popular lines of one-way bearings, designed to meet different load capacities and spatial requirements.
The CSK series represents a compact and lightweight design, ideal for applications with limited space and moderate torque requirements. These bearings are characterized by their thin cross-section and high precision, making them a perfect choice for high-speed environments.
Key Applications:
Office Automation Equipment: Printers, copiers, scanners.
Textile Machinery: Spinning frames, winders.
Medical Devices: Analytical instruments, power tools.
Small Automotive Components: Starter motors, actuators.
Household Appliances: Food processors, mixers.
Common Models & Dimensions (Overview):
| Model Number | Bore Diameter (mm) | Outer Diameter (mm) | Width (mm) |
|---|---|---|---|
| CSK 10 | 10 | 18 | 12 |
| CSK 12 | 12 | 21 | 13 |
| CSK 15 | 15 | 24 | 14 |
| CSK 20 | 20 | 30 | 16 |
| CSK 25 | 25 | 35 | 17 |
Note: Dimensions are nominal and may vary slightly by specific model. Please consult the official datasheet for precise tolerances and specifications.
The CKA series is built for more demanding applications that require higher torque transmission and greater radial load capacity. Featuring a robust design with needle roller technology, these bearings offer superior performance and extended service life in harsh operating conditions.
Key Applications:
Automotive Transmissions: Motorcycle starter clutches, powertrain systems.
Industrial Machinery: Conveyors, packaging equipment, printing presses.
Agricultural Equipment: Harvesters, tractors.
Power Tools: Drills, impact wrenches, lawn mowers.
Fitness Equipment: Treadmills, exercise bikes.
Common Models & Dimensions (Overview):
| Model Number | Bore Diameter (mm) | Outer Diameter (mm) | Width (mm) |
|---|---|---|---|
| CKA 20 | 20 | 32 | 22 |
| CKA 25 | 25 | 38 | 25 |
| CKA 30 | 30 | 42 | 26 |
| CKA 40 | 40 | 55 | 30 |
| CKA 50 | 50 | 65 | 35 |
Note: Dimensions are nominal and may vary slightly by specific model. Please consult the official datasheet for precise tolerances and specifications.
Why Choose UJK One-Way Bearings?
High Quality Materials: Manufactured from premium bearing steel and surface-treated for superior wear and corrosion resistance.
Precision Engineering: Guaranteed consistent performance and minimal backlash for smooth engagement and disengagement.
Extensive Range: A comprehensive portfolio of models and series to meet diverse application needs.
Reliability: Rigorous testing ensures every bearing meets our high standards for durability and torque capacity.
Get in Touch
For detailed technical specifications, CAD drawings, or to discuss your specific application requirements, please contact our engineering support team or visit our website.



