311 NR/VK504
300 Series Snap Ring Bearings
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Part No.
Part No.
311 NR/VK504
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.5 kg
Tolerance class
ABEC 1 | ISO P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.015mm to 0
Outside diameter
120 mm
Outside diameter tolerance
-0.015mm to 0
Width
29 mm
Width tolerance
-0.15mm to 0
Outer Ring Dimensions
Outer ring locating feature
Snap Ring (fitted)
Outside diameter of snap ring
129.7 mm
Width of snap ring
2.82 mm
Performance
Temperature range
-30°to 120 °C
Radial dynamic load rating
17805 lbf
Radial static load rating
15062 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
None
Radial internal clearance
CN
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Chrome Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
Price available upon request.
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311 NR/VK504 Bearing Product Overview & Core Advantages
The 311 NR is a single row deep groove ball bearing engineered for robust radial load applications requiring reliable performance. Its open design facilitates easy relubrication, while the integral snap ring on the outer ring provides secure axial location within a housing, simplifying assembly. Manufactured from high-grade chrome steel and built to ABEC 1 | ISO P0 tolerance standards, this bearing offers a dependable solution for general industrial machinery where precision and durability are paramount.
311 NR/VK504 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 311 | Standard bore diameter series designation. |
| NR | Indicates the outer ring has a snap ring groove and a snap ring is fitted. This feature aids in axial location and simplifies housing design. |
311 NR/VK504 Bearing Structural Features & Performance Benefits
- Robust Radial Load Capacity: The single row deep groove construction is optimized to handle significant radial loads (Dynamic: 17,805 lbf / Static: 15,062 lbf), making it a workhorse in demanding applications.
- Secure Axial Location: The integrated snap ring prevents creeping of the outer ring within the housing, ensuring stable bearing positioning and enhancing operational reliability.
- High-Speed Capability: With a limiting speed of 6,300 rpm, the bearing is suitable for a wide range of industrial speeds. The open design allows for optimal lubrication flow, which is critical for high-speed performance.
- Versatile & Durable Construction: All core components—rings, balls, and cage—are manufactured from chrome steel, providing high strength, wear resistance, and a long service life under standard operating temperatures (-30°C to 120°C).
311 NR/VK504 Bearing Typical Application Areas
- Electric Motors and Generators
- Industrial Gearboxes and Transmissions
- Material Handling Conveyors
- Agricultural Machinery
- Pumps and Fans
