QJ 304 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 304 N2MA
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
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In Stock
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QJ 304 N2MA Bearing Product Overview & Core Advantages
The QJ 304 N2MA is a high-precision metric single row four point contact ball bearing engineered for demanding applications requiring exceptional accuracy and load handling. This bearing is distinguished by its ability to simultaneously support substantial combined loads—significant radial loads and axial loads in both directions—within a remarkably compact cross-section. Manufactured to a P6 (ABEC-3) tolerance class, it delivers the high running accuracy and dimensional stability essential for high-performance machinery. Its pre-lubricated and open design ensures immediate readiness for installation, making it an ideal solution for applications prioritizing high rigidity and operational reliability.
QJ 304 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| QJ 304 | Denotes the bearing series and size. A four-point contact bearing with a 20mm bore, 52mm OD, and 15mm width. |
| N2 | Indicates the bearing has two machined grooves in the outer ring for locating snap rings, aiding in axial location. |
| MA | Signifies that the bearing is pre-lubricated with a specific high-quality lubricating grease. |
QJ 304 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The optimized raceway geometry allows a single row bearing to efficiently handle combined radial and bidirectional axial loads, offering a compact and weight-saving alternative to traditional bearing arrangements.
- High Rigidity & Precision: The brass cage provides excellent dimensional stability and guidance, while the P6 tolerance class ensures minimal runout and smooth, precise operation, contributing to superior system high rigidity.
- Optimized Load Capacity: With a dynamic load rating of 7200 lbf and a static load rating of 4860 lbf, this bearing is built for durability and long service life under significant combined loads.
- Simplified Installation & Axial Location: The N2 suffix denotes snap ring grooves, which facilitate secure axial positioning within the housing, simplifying assembly and maintenance.
- Ready-to-Use Lubrication: The pre-applied lubricating grease (MA) ensures immediate operation and provides reliable performance across the specified temperature range of -30°C to 110°C.
QJ 304 N2MA Bearing Typical Application Areas
This bearing's unique combination of compact design, high precision, and robust load capacity makes it suitable for a wide range of industrial applications, including:
- Robotics and Automation: Precision joints, rotary actuators, and gearboxes.
- Machine Tools: Rotary tables, indexing heads, and high-precision spindles.
- Aerospace & Defense: Actuation systems, radar platforms, and guidance systems.
- Medical Equipment: High-accuracy scanners and surgical robot arms.
- Industrial Pumps and Compressors: Where compactness and the ability to handle combined loads are critical.
