71905 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 ACE/HCP4A
Basic Information
System of measurement
Metric
Weight
0.036 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
42 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
16
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1141 lbf
Radial static load rating
596 lbf
Limiting speed
83 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:
$ 177.02
/ each
In Stock
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71905 ACE/HCP4A Bearing Product Overview & Core Advantages
The 71905 ACE/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing features a 25° contact angle and is supplied with a preload, delivering superior running accuracy and high rigidity. Its compact design, combined with a P4 (ABEC-7) tolerance class and ceramic balls, makes it ideal for high-speed spindles and other precision machinery where reliability and minimal rotational error are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 9mm width). |
| ACE | Designates a 25° contact angle and specific internal design optimizations. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4 | Specifies the P4 (ABEC-7) tolerance class for high-precision applications. |
| A | Denotes that the bearing is supplied with a preload for enhanced rigidity. |
71905 ACE/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability & Reduced Friction: The combination of hybrid ceramic balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 83,000 rpm. This design also minimizes heat generation.
- Superior Rigidity & Running Accuracy: The 25° contact angle and applied preload provide excellent axial and radial stiffness, ensuring precise shaft positioning and minimal deflection under load.
- Extended Service Life & Reliability: Ceramic balls are harder, lighter, and offer superior resistance to wear and electrical arcing compared to steel. The P4 precision and tight dimensional tolerances guarantee consistent, long-term performance.
- Optimized for Precision Applications: The open seal type allows for custom lubrication schemes, while the standard lubrication is suitable for a wide temperature range of -30°C to 110°C.
71905 ACE/HCP4A Bearing Typical Application Areas
The 71905 ACE/HCP4A is specifically designed for high-performance applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors and Drives
- Semiconductor Manufacturing Equipment
- Aerospace Instrumentation and Gyroscopes
