6904ZZ Deep Groove Ball Bearing
Shielded Ball Bearing for High-Speed and Space-Constrained Applications
The 6904ZZ deep groove ball bearing is designed for equipment that requires smooth rotation, compact dimensions, and reliable performance over extended operating cycles. Featuring metal shields on both sides, this bearing helps protect internal components from dust and debris while maintaining low friction characteristics suitable for higher-speed applications.
With its thin-section design and standardized dimensions, the 6904ZZ bearing is widely used in electric motors, automation equipment, medical devices, conveyor systems, gearboxes, and precision machinery where installation space is limited.
Manufactured from premium bearing steel and subjected to strict quality inspection procedures, our 6904ZZ bearings are supplied to OEM manufacturers, industrial distributors, and maintenance service providers worldwide.
Key Benefits
Compact Design for Limited Installation Space
The 6904 series features a slim cross-section that allows engineers to reduce equipment size without compromising rotational performance.
Low Friction Operation
Metal shields create less contact resistance than rubber seals, making the bearing suitable for applications requiring higher rotational speeds.
Factory-Lubricated for Convenience
Each bearing is pre-greased before shipment, allowing immediate installation and reducing maintenance requirements during operation.
Stable Running Accuracy
Precision grinding and controlled manufacturing tolerances contribute to smooth rotation, low vibration levels, and consistent performance.
Long-Term Reliability
High-quality steel materials and optimized heat treatment processes help improve fatigue resistance and extend service life.
Technical Specifications
| Item | Specification |
|---|---|
| Bearing Model | 6904ZZ |
| Bearing Type | Deep Groove Ball Bearing |
| Bore Diameter (d) | 20 mm |
| Outer Diameter (D) | 37 mm |
| Width (B) | 9 mm |
| Shield Type | Double Metal Shields (ZZ) |
| Material | Chrome Steel SAE 52100 / GCr15 |
| Cage Material | Steel Cage |
| Precision Grade | P0, P6, P5 Available |
| Clearance Options | C0, C3 |
| Lubrication | Factory Greased |
| Operating Temperature | -20°C to +120°C |
Additional specifications are available for customized projects.
Bearing Dimensions
| Parameter | Value |
|---|---|
| Inner Diameter | 20 mm |
| Outer Diameter | 37 mm |
| Width | 9 mm |
| Bearing Series | 6900 Series |
| Design Type | Thin Section Deep Groove |
The standardized dimensions allow easy interchangeability with equivalent international bearing brands.
Material Options
Depending on the application environment, the 6904 bearing can be supplied in multiple material configurations.
| Material | Recommended Use |
|---|---|
| Chrome Steel | General industrial equipment |
| Stainless Steel | Humid or corrosive environments |
| Hybrid Ceramic | High-speed and electrical insulation applications |
| Full Ceramic | Chemical processing and specialty industries |
Our engineering team can assist in selecting the most suitable material based on operating conditions.
6904ZZ vs 6904-2RS
| Feature | 6904ZZ | 6904-2RS |
|---|---|---|
| Shield Type | Metal Shields | Rubber Seals |
| Friction Level | Lower | Slightly Higher |
| Maximum Speed | Higher | Moderate |
| Dust Protection | Good | Excellent |
| Moisture Resistance | Limited | Excellent |
| Typical Environment | Clean Conditions | Dusty or Wet Conditions |
Selecting the appropriate version depends on operating speed, environmental conditions, and maintenance expectations.
Quality Assurance
To maintain consistent quality, every production batch undergoes multiple inspection procedures, including:
Material composition verification
Hardness testing
Dimensional inspection
Radial clearance measurement
Noise and vibration analysis
Surface finish evaluation
Lubrication consistency checks
These measures help ensure stable performance and product consistency across large-volume orders.
Product size chart
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