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| Customization: | Available |
|---|---|
| Rolling Body: | Roller Bearings |
| The Number of Rows: | Single |
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The UJK K Series Needle Roller and Cage Assembly is a compact, high-performance bearing solution designed for applications where radial space is severely constrained. Unlike conventional bearings, this assembly lacks inner and outer rings-instead, it utilizes the shaft and housing bore as direct raceways. This design achieves exceptional radial load capacity and rigidity while minimizing cross-sectional height, making it ideal for high-precision machinery in automotive, industrial, and power transmission systems137.
Space-Saving Design
With no inner/outer rings, the radial cross-section is reduced by 15-30% compared to standard bearings, enabling ultra-compact installations (e.g., transmissions, gear pumps)37.
High Load Capacity & Rigidity
Engineered to handle extreme radial loads despite minimal dimensions. Precision-ground needle rollers (G2-grade tolerance, diameter accuracy: ±2μm) and robust cages ensure optimal force distribution710.
Precision Performance
Requires hardened (HRC 58-64) and finely ground shaft/housing surfaces (Ra ≤0.32μm, or Ra ≤0.20μm for high-rotation accuracy). This minimizes operational clearance and enhances rotational precision110.
Versatile Configurations
Single-Row (K): Standard for most applications.
Double-Row (K.ZW/KK): For higher load demands.
Split-Type (K.D/K.ZW.D): Facilitates installation in hard-to-access assemblies4710.
Material & Durability
Cage: Low-carbon steel (carburized/blackened) or nylon (optional), ensuring wear resistance79.
Needle Rollers: GCr15 bearing steel, hardened to HRC 60-64710.
Cost Efficiency
Eliminates ring manufacturing costs, offering a budget-friendly solution without compromising performance110.
Automotive: Transmissions, steering systems, piston pins
Industrial Machinery: Gear pumps, compressors, textile equipment17.
Power Tools & Agriculture: High-load, compact drivetrains9.
| Model | Inner Diameter (mm) | Outer Diameter (mm) | Width (mm) | Weight (g) | Configuration |
|---|---|---|---|---|---|
| K5×8×10 TN | 5 | 8 | 10 | 2 | Single-row3 |
| K21×25×13 | 21 | 25 | 13 | 9 | Single-row1 |
| K28×34×20 | 28 | 34 | 20 | 35 | Single-row9 |
| K47×52×27 | 47 | 52 | 27 | 150 (est.) | Single-row6 |
| K×ZW (e.g., K8×11×10ZW) | 8 | 11 | 10 | 12 (est.) | Double-row7 |
| K×D (e.g., K6×9×8D) | 6 | 9 | 8 | 5 (est.) | Split-type4 |
Notes:
Shaft/Housing Requirements: Hardened to HRC 58-64, surface roughness ≤0.32μm Ra110.
Customization: Non-standard sizes (e.g., KNL long-roller types) and materials (nylon cages) available79.
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