309 NR
300 Series Snap Ring Bearings
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Basic Information
Main Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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309 NR Bearing Product Overview & Core Advantages
The 309 NR is a single row deep groove ball bearing engineered for superior radial load capacity and reliable performance in demanding applications. Its key distinguishing feature is the integral snap ring on the outer ring, which provides secure axial location within the housing, simplifying assembly and reducing overall system costs. Manufactured to P0 tolerance class with standard CN radial internal clearance, this bearing offers a robust and cost-effective solution for general industrial machinery requiring precise shaft support.
309 NR Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 309 | Basic Bearing Number | Defines the standard metric dimensions: 45mm bore, 100mm OD, 25mm width. |
| NR | Snap Ring (fitted) | Indicates the outer ring has a groove and a snap ring is pre-fitted. This eliminates the need for a separate housing shoulder, saving space and cost. |
309 NR Bearing Structural Features & Performance Benefits
- Simplified Housing Design: The integrated snap ring acts as a positive axial locating feature, allowing for the use of simpler, more cost-effective housings without machined shoulders.
- High Radial Load Capacity: The deep groove raceway and chrome steel construction enable high dynamic (12,364 lbf) and static (9,892 lbf) radial load ratings.
- Robust Construction: Components made from chrome steel rings and balls, combined with a durable stainless steel cage, ensure long service life and reliable operation.
- Standard Precision & Clearance: Manufactured to P0 tolerance and standard CN radial internal clearance, making it suitable for a wide range of general-purpose applications.
309 NR Bearing Typical Application Areas
The 309 NR bearing is ideally suited for applications where secure axial location and ease of assembly are critical. Common uses include:
- Electric Motors and Gearboxes
- Industrial Fans and Blowers
- Conveyor Systems
- Agricultural Machinery
- Material Handling Equipment
