QJ 208 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 208 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.45 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.011mm to 0
Width
18 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.1 mm
Distance from side face to load point
42 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
49.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
66 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
12600 lbf
Radial static load rating
11025 lbf
Limiting speed
15 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
Price available upon request.
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QJ 208 N2MA Bearing Product Overview & Core Advantages
The QJ 208 N2MA 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 managing radial loads and axial loads from both directions, making it an ideal solution for compact, high-rigidity installations. Manufactured to P6 (ABEC-3) tolerance class, it delivers reliable performance in demanding operational environments. Its open design, when lubricated, supports efficient operation within a specified temperature range, offering a robust combination of high load capacity and precision engineering.
QJ 208 N2MA Bearing Model Code Explained, Specifications & Naming Convention
The model designation QJ 208 N2MA provides specific technical information:
- QJ: Denotes a four-point contact ball bearing type.
- 208: Standard size designation (40mm bore, 80mm OD, 18mm width).
- N2: Indicates specific internal design features for optimized load distribution.
- MA: Signifies the use of a brass cage (machined), contributing to high-speed stability and durability.
QJ 208 N2MA Bearing Structural Features & Performance Benefits
The bearing's construction delivers distinct performance advantages:
- Four-Point Contact Design: The raceway geometry 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 Rigidity and Precision: Built to P6 tolerance class with precise dimensional control, it ensures minimal runout and stable operation under load, critical for high-precision applications.
- Optimized Load Capacity: With a dynamic load rating of 12,600 lbf and a static load rating of 11,025 lbf, it is engineered for demanding duty cycles.
- High-Speed Capability: The machined brass cage (MA) provides excellent guidance and strength, supporting a limiting speed of 15,000 rpm.
- Durable Material Construction: Components made from chrome steel for rings and balls ensure high wear resistance and long service life.
QJ 208 N2MA Bearing Typical Application Areas
The QJ 208 N2MA is suited for a variety of precision industrial applications, including:
- Machine Tool Spindles
- Robotic Arms and Precision Gearboxes
- Pumps and Compressors
- Aerospace Actuation Systems
- Medical and Laboratory Equipment
