71904 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71904 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.033 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.006mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
15
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1287 lbf
Radial static load rating
686 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 157.18
/ each
In Stock
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71904 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71904 ACD/HCP4A is a single-row angular contact ball bearing designed for high-precision and high-speed applications. Engineered to a P4 (ABEC-7) tolerance class, it offers exceptional running accuracy. Its key advantage is the ability to accommodate significant axial loads in one direction, combined with radial loads, making it ideal for applications requiring high rigidity and precise shaft positioning. The combination of a ceramic ball material and phenolic cage contributes to its superior high-speed performance and reduced weight.
71904 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (9mm width, 20mm bore, 37mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a high internal design, typically associated with high load capacity. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls with steel rings. |
| P4 | Specifies the P4 (ABEC-7) tolerance class for ultra-precision. |
| A | Indicates that the bearing is supplied with a specific preload for immediate high-rigidity performance. |
71904 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The hybrid ceramic design (ceramic balls, steel rings) and lightweight phenolic cage significantly reduce centrifugal forces, enabling a high limiting speed of 75,000 rpm. This design also reduces operating temperature and extends service life.
- High Rigidity & Load Capacity: The 25° contact angle and optimized internal geometry provide excellent resistance to axial loads. The bearing is supplied with a preload, ensuring maximum system stiffness and precise rotational accuracy from the start.
- Precision Performance: Manufactured to P4 (ABEC-7) tolerances, this bearing guarantees minimal runout and vibration, which is critical for applications demanding extreme accuracy.
- Optimized Lubrication: The bearing comes pre-lubricated, ensuring immediate operational readiness and reliable performance within its specified temperature range of -30°C to 110°C.
71904 ACD/HCP4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Robotic Arm Joints and Drives
- Aerospace Instrumentation and Gyroscopes
