71900 ACD/HCP4ADFA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71900 ACD/HCP4ADFA
Basic Information
System of measurement
Metric
Weight
0.018 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
10 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
22 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
878 lbf
Radial static load rating
477 lbf
Limiting speed
95 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Face-to-Face (DF)
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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71900 ACD/HCP4ADFA Bearing Product Overview & Core Advantages
The 71900 ACD/HCP4ADFA is a duplex pair of super-precision angular contact ball bearings designed for the most demanding high-speed and high-rigidity applications. This matched Face-to-Face (DF) arrangement is preloaded to Extra Light (Class A) specifications, ensuring exceptional running accuracy and minimal axial and radial runout. The use of ceramic balls and a P4A tolerance class makes this bearing ideal for machine tool spindles and other precision equipment where superior rotational performance, high stiffness, and thermal stability are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71900 | Super-precision angular contact ball bearing series with a 10mm bore. |
| ACD | Contact Angle of 25°. |
| HCP4A | A duplex pair (Two bearings) in a Face-to-Face (DF) arrangement, manufactured to P4A tolerance class. |
| DF | Duplex Face-to-Face mounting. |
| A | Extra Light preload. |
71900 ACD/HCP4ADFA Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The duplex DF arrangement and P4A tolerance class provide exceptional system stiffness and rotational accuracy, critical for minimizing deflection under combined loads.
- Superior High-Speed Performance: The combination of ceramic balls (lower density reduces centrifugal forces) and a lightweight phenolic cage enables very high limiting speeds (95,000 rpm).
- Optimized Load Capacity: The 25° contact angle is optimized to handle significant axial loads in both directions, as well as radial loads.
- Thermal Stability: Ceramic balls have a lower coefficient of thermal expansion than steel, contributing to consistent preload and performance across the operating temperature range.
- Pre-lubricated: The bearing is supplied with grease, ready for immediate installation and initial operation.
71900 ACD/HCP4ADFA Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Robotics (Articulated arm joints)
- High-Frequency Motors and Spindle Drives
- Medical Equipment (High-speed dental handpieces, laboratory centrifuges)
- Aerospace Instrumentation and Gyroscopes
