S71909 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71909 ACB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.13 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
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
4.762 mm
Ball quantity
27
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1580 lbf
Radial static load rating
1238 lbf
Limiting speed
30 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:
$ 424.03
/ each
In Stock
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S71909 ACB/HCP4A Bearing Product Overview & Core Advantages
The S71909 ACB/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered to a P4 (ABEC-7) tolerance class, it delivers superior running accuracy. Its key advantage lies in its ability to accommodate combined loads—simultaneously handling substantial radial and axial loads—thanks to its 25° contact angle. The use of ceramic balls and a phenolic cage contributes to high-speed capability, low heat generation, and extended service life, making it an ideal solution for high-reliability, high-rigidity spindle systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71909 | Denotes the bearing series and size (45mm bore, 68mm OD, 12mm width). |
| ACB | Indicates a 25° contact angle and a specific internal design optimized for high rigidity and speed. |
| HCP4A | Signifies a P4 (ABEC-7) tolerance class and the inclusion of a preload for enhanced stiffness and precise shaft positioning. |
S71909 ACB/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single, matched arrangement with a defined preload ensures maximum system stiffness and minimal runout, which is critical for high-precision machining and instrumentation.
- Superior Load Capacity: The 25° contact angle is engineered to efficiently support combined radial and axial loads, providing stable performance under complex loading conditions.
- High-Speed Performance: The combination of ceramic balls (reducing centrifugal forces and friction) and a lightweight phenolic cage allows for a high limiting speed of 30,000 rpm.
- Sealed and Lubricated for Life: As a sealed bearing that is pre-lubricated, it is protected from contamination and is designed for maintenance-free operation within its specified temperature range of -30°C to 110°C.
S71909 ACB/HCP4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles (e.g., for CNC milling and grinding)
- High-frequency Electric Spindles
- Precision Robotics and Automation Arms
- High-speed Medical and Dental Handpieces
- Advanced Aerospace Instrumentation and Gyroscopes
