71908 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71908 ACB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.11 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.007mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
28
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1141 lbf
Radial static load rating
878 lbf
Limiting speed
50 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:
$ 314.07
/ each
In Stock
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71908 ACB/HCP4A Bearing Product Overview & Core Advantages
The 71908 ACB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. Positioned in the P4 (ABEC-7) tolerance class, it delivers superior running accuracy. Its core advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, with the 25° contact angle optimized for higher axial load capacity. The combination of a ceramic ball material and a phenolic cage enables outstanding high-speed performance and thermal stability, making it an ideal choice for demanding, high-rigidity systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation, indicating a high-precision angular contact bearing series with a 40mm bore. |
| ACB | Signifies a 25° contact angle and specific internal design for optimized load distribution. |
| HCP4A | Indicates a P4 (ABEC-7) tolerance class for ultra-precise running accuracy. The suffix may also denote a specific preload level (A) for consistent performance. |
71908 ACB/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4 tolerance class, this bearing ensures minimal runout and vibration, providing a stable and precise rotational axis for critical machinery.
- Superior High-Speed Capability: The lightweight, high-strength phenolic resin cage and low-density ceramic balls significantly reduce centrifugal forces, enabling a high limiting speed of 50,000 rpm.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently handle significant combined radial and axial loads, making it suitable for applications with complex loading conditions.
- Reduced Maintenance & Long Service Life: The open seal type allows for custom lubrication regimes, while the ceramic balls offer excellent wear resistance and reduced thermal expansion, contributing to a long operational lifespan.
71908 ACB/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance equipment, including:
- Machine Tool Spindles
- High-Frequency Motors & Spindles
- Precision Grinding Equipment
- Aerospace & Defense Systems
- High-Speed Robotic Drives
