QJ 318 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 318 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
6.45 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.015mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.02mm to 0
Width
43 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
3 mm
Distance from side face to load point
98 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
124 mm
Outer Ring Dimensions
Shoulder diameter outer ring
156 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
64125 lbf
Radial static load rating
68625 lbf
Limiting speed
6.3 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 318 N2MA Bearing Product Overview & Core Advantages
The QJ 318 N2MA is a high-precision Four Point Contact Ball Bearing engineered for exceptional performance in demanding applications. This single row bearing is designed to simultaneously accommodate combined loads, including significant radial loads and axial loads in both directions, within a compact cross-section. Manufactured to a P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliability. Its optimized internal geometry and robust construction make it an ideal solution for applications requiring high rigidity and precise rotational motion.
QJ 318 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Significance & Advantage |
|---|---|---|
| N2 | Snap ring groove on the outer ring with two locating slots for the snap ring | Facilitates simplified axial location and secure mounting within the housing, reducing assembly complexity. |
| MA | Bearing is filled with a specific, high-temperature, anti-wear lubricant | Provides ready-to-install, long-term lubrication, enhancing operational lifespan and reducing maintenance needs. |
QJ 318 N2MA Bearing Structural Features & Performance Benefits
- Four Point Contact Design: The raceway geometry allows the bearing to sustain combined radial and axial loads from both directions with a single bearing row, offering a space-saving and weight-reducing solution compared to traditional bearing arrangements.
- High Rigidity and Load Capacity: The robust chrome steel construction and optimized contact angles contribute to high stiffness, minimizing deflection under load. With a radial dynamic load rating of 64,125 lbf and a static load rating of 68,625 lbf, it is built for demanding applications.
- Precision and Speed Performance: The P6 tolerance class ensures high running accuracy, while the brass cage provides stability and allows for a limiting speed of 6,300 rpm, making it suitable for high-speed operations.
- Simplified Mounting and Maintenance: The snap ring groove (N2) enables secure and straightforward axial positioning. The bearing is pre-lubricated, offering a maintenance-free solution for the lubricant's service life within its specified temperature range of -30°C to 110°C.
QJ 318 N2MA Bearing Typical Application Areas
This bearing is ideally suited for machinery and equipment where high precision, compact design, and the ability to handle complex loads are critical. Key sectors include:
- Machine Tool Spindles
- Industrial Robots and Rotary Actuators
- Gearboxes and Power Transmission Systems
- Precision Turntables and Indexing Tables
- Pumps and Compressors
