QJ 336 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 336 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
47.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
180 mm
Bore diameter tolerance
-0.018mm to 0
Outside diameter
380 mm
Outside diameter tolerance
-0.028mm to 0
Width
75 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
196 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
252 mm
Outer Ring Dimensions
Shoulder diameter outer ring
309 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
153000 lbf
Radial static load rating
247500 lbf
Limiting speed
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
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In Stock
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QJ 336 N2MA Bearing Product Overview & Core Advantages
The QJ 336 N2MA is a Four Point Contact Ball Bearing designed for exceptional performance in demanding applications. This precision bearing is engineered to simultaneously accommodate combined loads, including radial loads and axial loads in both directions, within a compact, single-row design. Its construction ensures high rigidity and operational reliability, making it ideal for high-precision machinery where space constraints and load capacity are critical factors. The bearing comes pre-lubricated and is manufactured to P6 (ABEC-3) tolerance class for consistent, high-quality performance.
QJ 336 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the presence of two machined circumferential grooves in the outer ring for lubrication and potentially for sensor mounting. |
| MA | Signifies that the bearing is filled with a specific, high-performance lubricating grease. This pre-lubrication ensures immediate operation and long-term service life. |
QJ 336 N2MA Bearing Structural Features & Performance Benefits
- Four Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and axial loads from both directions efficiently, functioning similarly to a double row bearing in a more compact single row package. This contributes to its high rigidity and stability.
- Superior Load Capacity: With a dynamic load rating of 153,000 lbf and a static load rating of 247,500 lbf, this bearing is built for heavy-duty applications and long service life under significant stress.
- Precision & Speed: Manufactured to a P6 (ABEC-3) tolerance class, it ensures smooth running and precise positioning. The brass cage provides strength and stability, supporting a limiting speed of 3,000 rpm.
- Robust Construction: Made from chrome steel for both rings and balls, the bearing offers high durability and resistance to wear. The open seal type allows for optimal heat dissipation and is suitable for applications where external sealing is provided.
QJ 336 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high load capacity and compact design, such as:
- Industrial Turntables and Slewing Rings
- Machine Tool Rotaries and Indexing Tables
- Robotic Arms and Precision Gearboxes
- Wind Turbine Yaw and Pitch Systems
- Material Handling Equipment
