QJ 228 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 228 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
9.85 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.018mm to 0
Outside diameter
250 mm
Outside diameter tolerance
-0.02mm to 0
Width
42 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
3 mm
Distance from side face to load point
137 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
179 mm
Outer Ring Dimensions
Shoulder diameter outer ring
211 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
77625 lbf
Radial static load rating
106875 lbf
Limiting speed
4.3 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 228 N2MA Bearing Product Overview & Core Advantages
The QJ 228 N2MA is a high-precision four-point contact ball bearing designed for exceptional performance in demanding applications. This single row bearing is engineered to simultaneously accommodate combined loads, including significant radial loads and axial loads in both directions. Its compact design and P6 (ABEC-3) tolerance class make it an ideal solution for high-rigidity, high-reliability systems requiring precise rotational accuracy and smooth operation.
QJ 228 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the bearing has two machined circumferential grooves in the outer ring for lubrication and potentially for sensor placement. |
| MA | Signifies that the bearing is pre-lubricated with a specific high-performance grease suitable for the specified temperature range. |
QJ 228 N2MA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The four-point contact design provides high rigidity and enables the bearing to handle substantial combined radial and axial loads from both directions efficiently, making it highly space-saving compared to traditional bearing arrangements.
- Precision Performance: Manufactured to a P6 (ABEC-3) tolerance class, this bearing ensures high running accuracy and low noise levels, which is critical for precision machinery.
- Optimized for High Speeds: The brass cage ensures dimensional stability and reliable performance at the specified limiting speed of 4,300 rpm, even under complex loading conditions.
- Ready-to-Install & Reduced Maintenance: Being pre-lubricated (MA suffix), the bearing is ready for immediate installation, simplifying the assembly process and reducing initial maintenance requirements.
- Robust Material Construction: Made from chrome steel for both rings and balls, the bearing offers high durability, long service life, and consistent performance.
QJ 228 N2MA Bearing Typical Application Areas
- Industrial Robots (e.g., wrist and arm joints)
- Precision Machine Tool Components (e.g., rotary tables, indexing heads)
- Material Handling Equipment (e.g., slewing rings for small cranes)
- Aerospace Actuation Systems
- Medical and Semiconductor Manufacturing Equipment
