QJ 305 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 305 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.29 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.011mm to 0
Width
17 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.1 mm
Distance from side face to load point
30 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
34 mm
Outer Ring Dimensions
Shoulder diameter outer ring
49 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
9562 lbf
Radial static load rating
6750 lbf
Limiting speed
20 X 1000 rpm
Lubrication
Lubricated
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Brass
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
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QJ 305 MA Bearing Product Overview & Core Advantages
The QJ 305 MA is a metric single row four-point contact ball bearing engineered for applications requiring high precision and the ability to handle combined loads. Its unique design allows it to simultaneously support significant radial loads and axial loads from both directions, making it an exceptionally versatile and space-saving solution. Manufactured to a P6 (ABEC-3) tolerance class, this bearing delivers reliable performance in high-precision machinery, offering excellent rotational accuracy and operational stability.
QJ 305 MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 305 | Denotes the bearing series and size (25mm bore, 62mm OD). |
| M | Indicates the bearing is lubricated with a specific grease. |
| A | Specifies a contact angle of 30°, optimized for axial load capacity. |
QJ 305 MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The optimized raceway geometry enables a single bearing to withstand combined radial and bidirectional axial loads, simplifying assembly and reducing the need for complex bearing arrangements.
- High Precision & Rigidity: Built to P6 tolerance with a brass cage, this bearing ensures smooth operation, minimal vibration, and high running accuracy, which is critical for precision applications.
- Robust Load Capacity: With a dynamic load rating of 9562 lbf and a static load rating of 6750 lbf, it is designed for demanding operational conditions.
- Pre-Lubricated for Immediate Use: The bearing comes pre-lubricated, facilitating easy installation and providing immediate protection, suitable for a temperature range of -30°C to 110°C.
QJ 305 MA Bearing Typical Application Areas
This bearing is ideally suited for a wide range of industrial equipment, including:
- Industrial Robots and automation equipment (e.g., robotic arms, rotary joints)
- Precision Machine Tools, especially indexing tables and rotary supports
- Material Handling Systems such as turntables and slewing rings
- Aerospace Actuation Systems and radar platforms
