309 NR/C3
300 Series Snap Ring Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
309 NR/C3
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.88 kg
Tolerance class
ABEC 1 | ISO P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
100 mm
Outside diameter tolerance
-0.015mm to 0
Width
25 mm
Width tolerance
-0.12mm to 0
Outer Ring Dimensions
Outer ring locating feature
Snap Ring (fitted)
Outside diameter of snap ring
106.5 mm
Width of snap ring
2.46 mm
Performance
Temperature range
-30°to 120 °C
Radial dynamic load rating
12364 lbf
Radial static load rating
9892 lbf
Limiting speed
7.5 X 1000 rpm
Lubrication
None
Radial internal clearance
C3
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Chrome Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 20.83
/ each
In Stock
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309 NR/C3 Bearing Product Overview & Core Advantages
The 309 NR/C3 is a single row deep groove ball bearing designed for robust radial load applications requiring high reliability. This metric bearing features a snap ring on its outer ring, enabling simplified axial positioning within housings and reducing assembly complexity. Manufactured to ABEC 1 | ISO P0 tolerance class, it delivers consistent performance for general industrial use. Its C3 radial internal clearance makes it suitable for applications with expected thermal expansion or where interference fits are used, ensuring optimal operation under varying conditions.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 309 | Standard bearing series designation, indicating bore diameter: 45 mm, outside diameter: 100 mm, and width: 25 mm. |
| NR | Outer ring features a snap ring groove and a snap ring is fitted (Snap Ring width: 2.46 mm, OD: 106.5 mm). This facilitates secure axial location. |
| C3 | Indicates a greater than normal radial internal clearance. Ideal for applications with shaft or housing interference fits, or where operational temperatures cause differential expansion. |
309 NR/C3 Bearing Structural Features & Performance Benefits
- Robust Construction & High Load Capacity: Built entirely from chrome steel (rings, balls, and cage), this bearing offers high strength and durability. It supports a dynamic load rating of 12,364 lbf and a static load rating of 9,892 lbf, making it capable of handling significant radial loads.
- Simplified Assembly with Snap Ring: The integrated snap ring eliminates the need for complex housing shoulders or end caps, reducing part count, assembly time, and overall system cost.
- Optimized for Interference Fits & Thermal Expansion: The C3 clearance prevents bearing preload and potential seizure in applications involving press fits or elevated operating temperatures, ensuring smooth rotation and extended service life.
- Standard Precision & High-Speed Capability: Conforming to ABEC 1 (ISO P0) tolerance standards, it provides reliable performance for a wide range of applications with a limiting speed of 7,500 rpm.
309 NR/C3 Bearing Typical Application Areas
This bearing is commonly specified in:
- Electric Motors and Generators
- Gearboxes and Power Transmission Systems
- Industrial Pumps and Compressors
- Agricultural and Construction Machinery
- Material Handling Equipment (e.g., conveyor pulleys)
