QJ 205 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 205 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.16 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
52 mm
Outside diameter tolerance
-0.011mm to 0
Width
15 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1 mm
Distance from side face to load point
27 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
31.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
43 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
6075 lbf
Radial static load rating
4770 lbf
Limiting speed
22 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 205 MA Bearing Product Overview & Core Advantages
The QJ 205 MA is a metric single row four-point contact ball bearing engineered for applications requiring exceptional precision and load handling capabilities. This bearing is specifically designed to simultaneously accommodate combined radial and axial loads from both directions, making it an ideal solution for compact spaces where high performance is critical. Manufactured to a P6 (ABEC-3) tolerance class, it delivers superior running accuracy and rotational stability. Its pre-lubricated, open design ensures immediate operational readiness and reliable performance in demanding industrial environments.
QJ 205 MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ | Denotes a four-point contact ball bearing design. |
| 205 | Standard bore diameter code (25 mm) and dimension series. |
| M | Indicates the use of a brass cage for enhanced strength and guidance at moderate speeds. |
| A | Specifies an optimized contact angle of 30 degrees for superior axial load capacity. |
QJ 205 MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and bidirectional axial loads efficiently in a single, compact unit, simplifying assembly and reducing the need for multiple bearing arrangements.
- High Precision & Rigidity: Manufactured to P6 tolerance with precisely controlled bearing dimensions (25mm bore, 52mm OD), it provides excellent running accuracy and system rigidity for high-performance applications.
- Robust Material Construction: Components made from chrome steel and a brass cage (M) ensure high durability, wear resistance, and reliable operation under dynamic and static loads (6,075 lbf dynamic, 4,770 lbf static).
- Optimized for Speed & Temperature: The open, lubricated design supports a limiting speed of 22,000 rpm and operates effectively within a temperature range of -30°C to 110°C.
QJ 205 MA Bearing Typical Application Areas
This bearing is ideally suited for precision machinery and equipment where space is constrained and high load capacity is required. Key applications include:
- Robotics and Automation: Used in robotic arm joints and precision gearboxes.
- Machine Tool Spindles: Provides high rigidity and accuracy in milling and grinding spindles.
- Aerospace Actuators: Employed in control surface mechanisms and other critical flight systems.
- Industrial Turntables and Indexing Tables: Supports high moment loads and precise rotational positioning.
