71905 ACE/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 ACE/HCP4ADBA
Basic Information
System of measurement
Metric
Weight
0.072 kg
Tolerance class
P4A
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
18 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
1843 lbf
Radial static load rating
1192 lbf
Limiting speed
53 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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71905 ACE/HCP4ADBA Bearing Product Overview & Core Advantages
The 71905 ACE/HCP4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex back-to-back (DB) matched set features an Extra Light (A) preload and is manufactured to P4A tolerance class, ensuring superior running accuracy and minimal vibration. Its ability to handle combined loads (radial and axial) simultaneously, combined with its compact dimensions, makes it ideal for high-speed spindles and precision machinery where high rigidity and reliability are paramount.
71905 ACE/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 ACE/HCP4ADBA provides detailed technical specifications:
- 71905: Basic bearing series and size designation (25mm bore, 42mm OD, 18mm width).
- A: Denotes Extra Light preload class.
- CE: Indicates the use of Ceramic (Si3N4) balls.
- HC: Specifies a Phenolic (Polyamide) cage.
- P4A: Signifies a super precision tolerance class.
- DB: Identifies the bearings as a Duplex Back-to-Back matched pair.
- A: Reiterates the Extra Light preload for the matched set.
71905 ACE/HCP4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads, enhancing spindle stability and machining precision.
- Superior Speed & Temperature Performance: The combination of a lightweight phenolic cage and low-friction ceramic balls significantly reduces centrifugal forces and operating temperatures, enabling a high limiting speed of 53,000 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class with a 25° contact angle, this bearing delivers exceptional running accuracy and is optimized for applications with high axial load requirements.
- Extended Service Life: Ceramic balls are harder, lighter, and more wear-resistant than steel, leading to reduced friction and a longer operational lifespan, especially in high-speed environments.
71905 ACE/HCP4ADBA Bearing Typical Application Areas
This high-precision bearing is engineered for advanced machinery and systems, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation instruments.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
