QJ 1021 N2MA/C4
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1021 N2MA/C4
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
2 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.015mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.018mm to 0
Width
26 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
2 mm
Distance from side face to load point
93 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
124 mm
Outer Ring Dimensions
Shoulder diameter outer ring
141 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
30375 lbf
Radial static load rating
38250 lbf
Limiting speed
6.7 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 1021 N2MA/C4 Bearing Product Overview & Core Advantages
The QJ 1021 N2MA/C4 is a metric single-row four-point contact ball bearing engineered for exceptional performance in demanding applications. This precision bearing is specifically designed to accommodate combined radial and axial loads from any direction simultaneously, making it an ideal solution for complex loading conditions. Its compact design, featuring a relatively narrow bearing width of 26mm, allows for space-saving installations without compromising on high load capacity and rigidity. Manufactured to a P6 (ABEC-3) tolerance class, it ensures high running accuracy and reliability for critical machinery.
QJ 1021 N2MA/C4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 1021 | Standard designation for a four-point contact ball bearing with a 105mm bore and 160mm outside diameter. |
| N2 | Indicates snap ring grooves on the outer ring, facilitating secure axial location in the housing. |
| MA | Specifies a brass cage, which provides excellent strength and guidance for high-speed operation. |
| C4 | Denotes a radial internal clearance greater than normal, suitable for applications with significant thermal expansion or specific preload requirements. |
QJ 1021 N2MA/C4 Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows a single-row bearingcombined loads efficiently, replacing the need for more complex bearing arrangements and simplifying system design.
- High Load Capacity: With a dynamic load rating of 30,375 lbf and a static load rating of 38,250 lbf, this bearing is built to withstand substantial forces, ensuring long service life under heavy-duty conditions.
- Precision & High-Speed Capability: The brass cage (MA) ensures stable operation and low wear at the limiting speed of 6,700 rpm. The P6 tolerance class guarantees precise running, minimizing vibration and noise.
- Robust Construction: Components made from chrome steel offer high hardness and fatigue resistance, while the open design is pre-lubricated for initial operation across a wide temperature range of -30°C to 110°C.
- Easy Installation: The outer ring snap ring grooves (N2) simplify axial positioning within the housing, reducing assembly time and complexity.
QJ 1021 N2MA/C4 Bearing Typical Application Areas
This bearing is optimally suited for applications requiring high precision and the ability to manage complex load scenarios. Key industries and machinery include:
- Industrial Robots (particularly in robotic arms and rotary joints)
- Machine Tool Turntables and Indexing Tables
- Wind Turbine Pitch and Yaw Control Systems
- Medical Equipment (e.g., CT scanner gantries)
- Radar Antennas and Satellite Communication Equipment
