308-ZNR
300 Series Snap Ring Bearings
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Basic Information
Main Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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308-ZNR Bearing Product Overview & Core Advantages
The 308-ZNR is a single row deep groove ball bearing designed for exceptional radial load capacity and reliable performance in demanding applications. This metric bearing features a shielded design on one side for contaminant protection and a snap ring on the outer ring for secure axial location within a housing, simplifying assembly. Manufactured from chrome steel with a stainless steel cage, it offers robust durability and consistent operation. Its P0 tolerance class and CN radial clearance make it a versatile and cost-effective choice for a wide range of industrial machinery, providing a balance of high limiting speed and significant dynamic and static load ratings.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 308 | Standard bearing series designation, indicating a 40 mm bore, 90 mm OD, and 23 mm width. |
| Z | Signifies a shielded (non-contact) seal on one side of the bearing to protect against large contaminants while maintaining low friction. |
| NR | Indicates the outer ring has a snap ring groove and a snap ring is fitted. This feature allows for simplified axial positioning and secure housing fit. |
308-ZNR Bearing Structural Features & Performance Benefits
- Robust Load Capacity: The single row deep groove construction is optimized to handle significant radial dynamic loads (10,274 lbf) and radial static loads (8,093 lbf), ensuring reliable performance under stress.
- Secure Axial Location: The integrated snap ring (fitted) on the outer ring eliminates the need for complex housing shoulders or end caps, providing a simple and effective method for axial retention and preventing creep.
- Controlled Contamination & Lubrication: The shielded (Z) design helps retain pre-applied grease lubrication and excludes larger particulates, contributing to extended service life and reduced maintenance. The standard CN radial internal clearance ensures optimal performance under normal operating conditions.
- High-Speed Capability: With a limiting speed of 8,500 rpm, the bearing is suitable for applications requiring rapid rotation, supported by the low-friction stainless steel cage and effective grease lubrication.
- Durable Material Construction: Rings and balls made from chrome steel provide high hardness and wear resistance, while the stainless steel cage offers excellent corrosion resistance and strength.
308-ZNR Bearing Typical Application Areas
The 308-ZNR is engineered for versatility and is commonly specified in:
- Electric Motors and Gearboxes
- Industrial Pumps and Fans
- Material Handling Equipment (e.g., conveyor systems)
- Agricultural Machinery
- Automotive Components (e.g., alternators, idlers)
Its combination of a snap ring for easy mounting and a shield for basic protection makes it an ideal choice for applications where housing design simplicity and cost-effectiveness are key considerations.
