71905 ACE/HCPA9AQBCB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 ACE/HCPA9AQBCB
Basic Information
System of measurement
Metric
Weight
0.14 kg
Tolerance class
PA9A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 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°C to 110 °C
Radial dynamic load rating
2992 lbf
Radial static load rating
2385 lbf
Limiting speed
83 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71905 ACE/HCPA9AQBCB Bearing Product Overview & Core Advantages
The 71905 ACE/HCPA9AQBCB is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This metric bearing features a light preload (Class B) and is supplied as a matched set of four bearings in a back-to-back (QBC) arrangement. Its core advantages include superior stiffness and the ability to handle combined loads (radial and axial) simultaneously, making it ideal for high-speed, high-rigidity spindles and precision machinery. The use of ceramic balls and a phenolic cage further enhances its performance in high-velocity applications.
71905 ACE/HCPA9AQBCB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 ACE/HCPA9AQBCB is decoded as follows:
- 71905: Basic series designation for a high-precision angular contact ball bearing with a 25mm bore and 42mm outside diameter.
- ACE: Internal design code specific to the manufacturer, indicating optimized internal geometry and performance characteristics.
- HCPA9A:
- HC: Denotes Hybrid Ceramic construction (steel rings with ceramic balls).
- P: Indicates a Phenolic (resin) cage material.
- A9A: Specifies the tolerance class PA9A, denoting very high running accuracy and dimensional precision.
- QBC: Denotes the bearing is part of a Quadruplex (set of 4) Back-to-Back matched arrangement.
71905 ACE/HCPA9AQBCB Bearing Structural Features & Performance Benefits
- Extreme Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an exceptionally rigid bearing system capable of supporting high combined loads and resisting moment loads. This configuration provides stable and precise shaft guidance under complex loading conditions.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a very high limiting speed of 83,000 rpm. This makes it an excellent choice for high-speed spindle applications.
- High Precision Operation: Manufactured to tolerance class PA9A, this bearing ensures minimal runout and vibration, which is critical for achieving high levels of machining accuracy and surface finish quality.
- Optimized Contact Angle: The 25° contact angle provides a balanced capacity for both radial and axial loads, making it versatile for various load conditions.
- Pre-Lubricated & Open Design: The bearing comes lubricated from the factory and features an open seal type, which is optimal for systems with centralized lubrication, allowing for efficient coolant and lubricant flow.
71905 ACE/HCPA9AQBCB Bearing Typical Application Areas
This high-performance bearing is specifically engineered for advanced machinery where precision, speed, and rigidity are paramount. Key applications include:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Axles
- High-Speed Robotics and automation arms
- Advanced Medical Device manufacturing equipment
- Aerospace component machining centers
