71909 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71909 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.12 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
68 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
23
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
2025 lbf
Limiting speed
34 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:
$ 353.23
/ each
In Stock
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71909 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71909 ACD/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications demanding exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction, it features a 25° contact angle for optimal load distribution. Its P4 (ABEC-7) tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other critical machinery. The combination of a phenolic cage and ceramic balls contributes to superior high-speed performance, reduced friction, and extended service life.
71909 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Indicates a 25° contact angle, optimized for high axial load capacity and rigidity. |
| HC | Refers to the Hybrid Ceramic construction, featuring ceramic balls for reduced weight, lower friction, and higher limiting speeds. |
| P4A | Denotes a P4 (ABEC-7) tolerance class with specific running accuracy enhancements for spindle applications. |
71909 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The lightweight phenolic resin cage and ceramic (Si3N4) balls significantly reduce centrifugal forces, enabling a high limiting speed of 34,000 rpm. This hybrid design also provides superior performance in lubricant-starved conditions.
- High Rigidity & Load Capacity: The 25° contact angle and optimized internal geometry provide excellent resistance to axial loads, ensuring stable and rigid support for spindles.
- Ultra-Precision: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving high surface finish quality in machining operations.
- Preload Availability: The bearing is supplied with a preload, which eliminates internal clearance and increases system stiffness for superior positional accuracy.
71909 ACD/HCP4A Bearing Typical Application Areas
This precision angular contact bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: High-frequency motors and main shafts.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other instrumentation requiring high accuracy and reliability.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
