QJ 215 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 215 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.45 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
75 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
130 mm
Outside diameter tolerance
-0.015mm to 0
Width
25 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.5 mm
Distance from side face to load point
72 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
88.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
112 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
28125 lbf
Radial static load rating
29700 lbf
Limiting speed
8.5 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 215 N2MA Bearing Product Overview & Core Advantages
The QJ 215 N2MA is a metric four-point contact ball bearing designed for exceptional performance in demanding applications. This single row bearing excels at simultaneously handling combined radial and axial loads from both directions, making it an extremely compact and efficient solution. Manufactured to P6 (ABEC-3) tolerance class, it delivers the high precision, high rigidity, and reliability required for sophisticated machinery. Its pre-lubricated design ensures immediate operation and long-term performance.
QJ 215 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 215 | Standard designation for a four-point contact ball bearing with a 75mm bore. |
| N2 | Indicates the bearing has two machined grooves in the outer ring for securing snap rings. |
| MA | Signifies that the bearing is filled with a high-temperature, high-speed lubricating grease. |
QJ 215 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to support substantial combined loads (radial and bidirectional axial loads) with a single row of balls, resulting in a compact bearing size and high load density.
- High Rigidity and Precision: Built to a P6 tolerance class with precise bearing dimensions (75mm bore, 130mm OD), it provides stable and accurate rotational performance, minimizing deflection under load.
- Optimized for High Speeds: The brass cage ensures smooth operation and guides the balls effectively, contributing to a high limiting speed of 8,500 rpm.
- Robust Construction & Axial Security: Made from chrome steel for both rings and balls, it offers excellent durability. The N2 designation provides grooves for snap rings, facilitating secure axial location within the housing.
- Ready-to-Use Lubrication: Pre-lubricated with a specialized grease (MA suffix) suitable for a wide temperature range of -30°C to 110°C, reducing initial setup time and maintenance.
QJ 215 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high precision and the ability to handle complex loading conditions. Key industries and equipment include:
- Industrial Robotic Arms and Gears
- Precision Machine Tool Spindles and Rotary Tables
- High-Speed Pumps and Compressors
- Aerospace Actuation Systems
- Medical and Laboratory Rotary Equipment
