QJ 311 MA
Four-Point Contact Bearings Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
QJ 311 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.75 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
120 mm
Outside diameter tolerance
-0.013mm to 0
Width
29 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
2 mm
Distance from side face to load point
61 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
70.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
97.8 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
30825 lbf
Radial static load rating
26550 lbf
Limiting speed
10 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.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
QJ 311 MA Bearing Product Overview & Core Advantages
The QJ 311 MA is a high-precision Four Point Contact Ball Bearing engineered for applications demanding exceptional rigidity and the ability to handle combined loads. Its single-row, four-point contact design enables it to support significant radial loads and axial loads in both directions simultaneously, making it an ideal, compact solution for high-accuracy and high-reliability machinery. Manufactured to a P6 (ABEC-3) tolerance class, this bearing ensures precise rotational accuracy and stable performance.
QJ 311 MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| MA | Indicates the bearing is pre-lubricated with a specific high-performance grease. |
QJ 311 MA Bearing Structural Features & Performance Benefits
- High Rigidity & Compact Design: The single-row, four-point contact construction provides high rigidity within a compact cross-section, offering robust support for shafts and reducing system deflection.
- Superior Load Capacity: Engineered for combined loads, this bearing efficiently manages substantial radial loads and bidirectional axial loads, simplifying bearing arrangements.
- Precision & High-Speed Capability: The brass cage ensures reliable guidance of the balls at high speeds, contributing to a limiting speed of 10,000 rpm. The P6 tolerance class guarantees smooth, precise operation.
- Ready-to-Use & Long Service Life: As an open bearing, it is pre-lubricated (MA suffix) for immediate installation and long-term, maintenance-free operation within its specified temperature range.
QJ 311 MA Bearing Typical Application Areas
This bearing is ideally suited for demanding applications across various industries, including:
- Machine Tool Spindles
- Industrial Robots and Manipulators
- Precision Gearboxes
- Pumps and Compressors
- Aerospace Control Systems
