71908 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 ACE/HCP4A
Basic Information
System of measurement
Metric
Weight
0.088 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
6.35 mm
Ball quantity
19
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2106 lbf
Radial static load rating
1282 lbf
Limiting speed
52 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:
$ 314.01
/ each
In Stock
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71908 ACE/HCP4A Bearing Product Overview & Core Advantages
The 71908 ACE/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and high-speed operation. Its design is optimized to support significant combined loads (radial and axial) simultaneously, making it ideal for high-rigidity applications. Featuring a P4 (ABEC-7) tolerance class, ceramic balls, and a phenolic cage, this bearing delivers exceptional rotational accuracy, reduced friction, and superior performance in demanding environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 12mm width). |
| ACE | Internal design code, typically indicating optimized internal geometry for high-speed performance and specific contact angle. |
| HC | Indicates the use of Hybrid Ceramic balls (ceramic balls with steel rings). |
| P4 | Specifies the P4 (ABEC-7) tolerance class, denoting very high precision. |
| A | Denotes a 25° contact angle, optimized for supporting higher axial loads. |
71908 ACE/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This extends bearing life and enables higher limiting speeds compared to all-steel bearings.
- High-Speed Phenolic Cage: The lightweight and robust phenolic cage ensures stable operation at the high limiting speed of 52,000 rpm, offering excellent strength and guidance with minimal centrifugal force.
- Precision & Rigidity: Manufactured to P4 tolerance class, this bearing provides exceptional running accuracy. The 25° contact angle and optimized internal geometry provide high rigidity and excellent capacity for combined loads.
- Preload Availability: The bearing is supplied with preload available, allowing for precise adjustment of internal clearance to eliminate play and maximize system stiffness in the application.
71908 ACE/HCP4A Bearing Typical Application Areas
The 71908 ACE/HCP4A is ideally suited for high-performance machinery requiring precision and speed, including:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors
- Turbochargers
- Advanced Robotics and Automation Systems
