QJ 1988 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1988 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
64 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
440 mm
Bore diameter tolerance
-0.035mm to 0
Outside diameter
600 mm
Outside diameter tolerance
-0.038mm to 0
Width
74 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
364 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
495 mm
Outer Ring Dimensions
Shoulder diameter outer ring
544 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
171225 lbf
Radial static load rating
427500 lbf
Limiting speed
1.5 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 1988 N2MA Bearing Product Overview & Core Advantages
The QJ 1988 N2MA is a metric four-point contact ball bearing engineered for applications requiring exceptional load handling in compact spaces. This single-row bearing is distinguished by its ability to simultaneously support substantial radial loads and axial loads from both directions. Manufactured to P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliability, making it an ideal component for heavy-duty, precision machinery where space constraints and high load capacity are critical design factors.
QJ 1988 N2MA Bearing Model Code Explained, Specifications & Naming Convention
The model designation QJ 1988 N2MA provides specific technical information:
- QJ: Denotes the basic bearing type as a four-point contact ball bearing.
- 1988: Specifies the dimensional series and bore size.
- N2: Indicates special design features related to internal geometry and load points.
- M: Signifies that the bearing is supplied with a brass cage.
- A: Refers to a specific internal design and optimized contact angle for enhanced axial load capacity.
QJ 1988 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to accommodate combined radial and bidirectional axial loads efficiently in a single row, resulting in a compact bearing size with a high load density.
- High Load Capacity: With a dynamic load rating of 171,225 lbf and a static load rating of 427,500 lbf, it is built to withstand severe operating conditions.
- Precision & Rigidity: The P6 tolerance class ensures precise running and high system rigidity. The optimized distance from side face to load point (364 mm) contributes to stable moment load support.
- Durable Construction: Components made from chrome steel (rings and balls) and a robust brass cage provide excellent durability and reliable performance under high limiting speeds of 1,500 rpm.
- Wide Operating Range: Pre-lubricated and capable of operating within a temperature range of -30°C to 110°C.
QJ 1988 N2MA Bearing Typical Application Areas
This bearing is ideally suited for heavy-duty industrial applications, including:
- Industrial Gearboxes and large power transmission systems.
- Heavy-Duty Machine Tools, particularly in rotary tables and slewing rings.
- Construction Machinery such as excavators and cranes.
- Material Handling Equipment including large turntables and indexing devices.
- Wind Turbine pitch and yaw control systems.
