| Customization: | Available |
|---|---|
| Package: | Plastic Tube or Single Box |
| Precision: | P0 P6 P5 |
|
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| 6305X2-Z/P53Z2 | |||
| Deep groove ball bearing motorcycle bearings | |||
| Boundary Dimensions (mm) | Bore Dia | d |
25 |
| Outer Dia | D |
62 | |
| Width | B |
16 | |
1. Function & Key Features
UJK bearings are precision components designed to support rotating shafts in motorcycles, reducing friction, ensuring alignment, and enhancing durability under high-speed, high-load, and variable-temperature conditions. Key features include:
Material: High-carbon chromium steel (e.g., SUJ2) or stainless steel for corrosion resistance1.
Sealing: Options like 2RS (double rubber seals) or ZZ (metal shields) prevent contamination from dust/moisture1.
Precision: Tolerance classes up to P4 (ISO standard) for reduced vibration and noise1.
Special Designs: Angular contact bearings (e.g., AC) handle combined radial/axial loads; tapered rollers (e.g., 30200 series) suit wheel hubs1.
2. Model Identification System
UJK follows ISO/ABMA bearing codes. A typical model (e.g., 6205-2RS/C3) is decoded as:
Basic Code:
6: Type (e.g., 6 = Deep Groove Ball Bearing).
2: Dimension series (width/diameter profile, e.g., 2 = light series).
05: Bore size = 05×5 = 25 mm (for codes ≥04, multiply by 5)12.
Suffixes:
-2RS: Double rubber seals.
/C3: Radial clearance > standard (suits thermal expansion)1.
3. Size-to-Model Conversion
To identify a UJK model from dimensions:
Bore Diameter (d):
If 20-480 mm, calculate: d = Last two digits of model × 5 (e.g., 05 → 25 mm)2.
For d < 20 mm: 00=10 mm, 01=12 mm, 02=15 mm, 03=17 mm1.
Outer Diameter (D) & Width (B): Cross-reference with dimension tables (no direct formula)23.
Example: A bearing with d=25 mm, D=52 mm, B=15 mm corresponds to 62052.
4. Motorcycle-Specific Design
High RPM: Cage designs (e.g., brass M or polymer T) minimize centrifugal force1.
Load Capacity: Cylindrical roller bearings (e.g., NU, NJ series) for drive sprockets; thrust bearings for clutch assemblies1.
Temperature: Suffixes like X28 (200°C limit) for exhaust/crankcase areas1.
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