308-Z Deep Groove Ball Bearing
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Request Quote| Part Number | 308-Z |
| Category | Single Row Deep Groove Ball Bearings With Filling Slots |
| Brand | JMP® |
| Interchangeable With | SKF |
| Bore Diameter | 40.0000 mm |
| Outer Diameter | 90.0000 mm |
| Width | 23.0000 mm |
| Bore Tolerance | -0.012mm to 0 |
| Outer Tolerance | -0.015mm to 0 |
| Width Tolerance | -0.12mm to 0 |
| Chamfer Dimension | 1.10 mm |
| Dynamic Radial Load | 10,274 lbf |
| Static Radial Load | 8,093 lbf |
| Construction | Single Row |
| Seal Type | Shielded |
| Bearing Type | Ball |
| Load Direction | Radial |
| System of Measurement | Metric |
| Ring Material | Chrome Steel |
| Ball / Roller Material | Chrome Steel |
| Cage Material | Steel |
| Reference Speed | 8,500 rpm |
| Limiting Speed (Grease) | 9,000 rpm |
| Limiting Speed (Oil) | — |
| Radial Clearance | CN |
| Tolerance Class | P0 |
| Bore Tolerance | -0.012mm to 0 |
| Outer Ring Tolerance | -0.015mm to 0 |
| Width Tolerance | -0.12mm to 0 |
| Temperature Range | -30° to 120 °C |
| RoHS | Compliant |
| REACH | Compliant |
| Weight | 0.6400 g |
| Brand | Equivalent |
|---|---|
| SKF | 308-Z |
The 308-Z is a high-quality Deep Groove Ball Bearing with bore diameter of 40.0000 mm, outer diameter of 90.0000 mm, and width of 23.0000 mm.
Equipped with Shielded sealing, the 308-Z bearing offers effective protection against dust and moisture while retaining internal lubricant, reducing maintenance requirements.
With a dynamic radial load rating of 10,274 lbf and static load rating of 8,093 lbf, the 308-Z is engineered to handle demanding operating conditions. It supports speeds up to 9,000 rpm, making it suitable for high-speed applications.
- High load-carrying capacity (10,274 lbf dynamic) for extended service life
- Optimized operating speed for stable performance
- Shielded sealing for reduced maintenance and longer bearing life
- Precision manufacturing to ISO standards ensures consistent quality
- Fully interchangeable with major international brands (SKF, NSK, FAG, NTN)
The 308-Z is available in Open (no seal), ZZ (metal shield), and 2RS (rubber seal) configurations. Open bearings offer higher speed ratings and lower friction, while sealed versions provide better contamination protection and reduced maintenance requirements.
JMP Bearings manufactures the 308-Z in various tolerance classes including ABEC-1 (standard), ABEC-3, ABEC-5 (precision), and ABEC-7 (high precision). Please contact us for specific tolerance class availability and pricing.
The 308-Z typically uses lithium-based grease (e.g., ISO VG 68) for general applications. For high-temperature or high-speed applications, synthetic greases such as polyurea-based lubricants are recommended. Contact our engineering team for application-specific lubrication guidance.
JMP Bearings offers flexible ordering - sample quantities are available from 1 piece. For bulk orders, we provide tiered pricing starting at 100, 500, and 1000+ pieces. Contact us for a custom quote tailored to your volume.
For standard 308-Z applications, shaft tolerance is typically k5 or j6, and housing tolerance is typically H7 or J6. Exact tolerance selections depend on load conditions, speed, and operating temperature. Refer to ISO 286 or consult our engineering support for detailed recommendations.
