QJ 304 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 304 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.18 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
52 mm
Outside diameter tolerance
-0.011mm to 0
Width
15 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.1 mm
Distance from side face to load point
25 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
27.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
40.8 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
7200 lbf
Radial static load rating
4860 lbf
Limiting speed
24 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
No drawings available at the moment, will be launched soon
In Stock
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QJ 304 MA Bearing Product Overview & Core Advantages
The QJ 304 MA is a four-point contact ball bearing designed for applications requiring exceptional precision and load handling capabilities. This metric single-row bearing excels in simultaneously supporting combined radial and axial loads from both directions, making it an ideal solution for compact, high-rigidity arrangements. Manufactured to P6 (ABEC-3) tolerance, it delivers reliable performance in demanding operational environments with a broad temperature range from -30°C to 110°C.
QJ 304 MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| MA | Indicates the bearing is lubricated with a specific grease suitable for the operating temperature range. |
| Open | No contact seals, allowing for higher limiting speeds and optimal for applications where external sealing is provided. |
QJ 304 MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: Enables the bearing to handle combined radial and bidirectional axial loads efficiently in a single, compact unit, reducing the need for complex bearing arrangements.
- High Precision & Rigidity: Built to P6 tolerance class with precisely defined shoulder diameters, ensuring stable rotational accuracy and minimal deflection under load.
- Optimized for High Speeds: The open design and brass cage contribute to a high limiting speed of 24,000 rpm, making it suitable for high-speed spindles and rotors.
- Robust Material Construction: Components made from chrome steel for rings and balls, and a brass cage offer excellent durability and wear resistance.
- Pre-lubricated: The MA suffix indicates factory-applied lubrication, providing immediate readiness for operation and reducing initial maintenance requirements.
QJ 304 MA Bearing Typical Application Areas
The QJ 304 MA is widely used in precision machinery and high-performance systems, including:
- Machine Tool Spindles
- Industrial Robots & Automation Equipment
- Precision Gearboxes
- Pumps and Compressors
- Aerospace Actuation Systems
