QJ 305 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 305 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.29 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.011mm to 0
Width
17 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.1 mm
Distance from side face to load point
30 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
34 mm
Outer Ring Dimensions
Shoulder diameter outer ring
49 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
9562 lbf
Radial static load rating
6750 lbf
Limiting speed
20 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 305 N2MA Bearing Product Overview & Core Advantages
The QJ 305 N2MA is a metric single row four-point contact ball bearing engineered for applications requiring exceptional precision and load handling capabilities. This precision bearing is distinguished by its ability to simultaneously support substantial combined loads—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, making it an ideal component for high-performance mechanical systems demanding high rigidity and operational stability.
QJ 305 N2MA Bearing Model Code Explained, Specifications & Naming Convention
The QJ 305 N2MA model designation provides specific technical details:
- QJ: Denotes the bearing series as a four-point contact ball bearing.
- 305: Specifies the bearing dimensions; a 25 mm bore, 62 mm outside diameter, and 17 mm width.
- N2: Indicates a specific internal design, likely defining the contact angle and raceway geometry optimized for four-point contact.
- MA: Specifies the cage material and type. "M" typically represents a machined brass cage, offering excellent strength and guidance at high speeds.
QJ 305 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows a single bearing to accommodate combined radial and bidirectional axial loads efficiently, simplifying assembly and saving space compared to traditional bearing pairs.
- High Rigidity and Load Capacity: The robust construction and chrome steel components contribute to high stiffness, supporting a dynamic load rating of 9562 lbf and a static load rating of 6750 lbf.
- Precision Performance: Manufactured to P6 tolerance, this bearing ensures minimal runout and vibration, which is critical for high-precision applications.
- Optimized for Speed: The standard brass machined cage (MA) provides superior guidance and stability, contributing to a high limiting speed of 20,000 rpm.
- Versatile Operating Range: With a temperature range from -30°C to 110°C and being pre-lubricated, it is ready for immediate use in a wide array of environments.
QJ 305 N2MA Bearing Typical Application Areas
This bearing is ideally suited for demanding applications where compact design, high precision, and the ability to handle complex loads are paramount. Key industries and equipment include:
- Robotics and Automation: Used in robotic arm joints and precision positioning stages.
- Machine Tool Spindles: Provides high rigidity and accuracy in machining centers.
- Turntables and Indexing Tables: Ideal for applications requiring high moment load capacity and precise rotation.
- Aerospace Actuation Systems: Employed in control surfaces and other mechanisms requiring reliability under combined loads.
- High-Speed Pumps and Compressors: Its high-speed capability and load rating make it a reliable choice for fluid handling equipment.
