71902 ACE/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71902 ACE/P4AQBCB
Basic Information
System of measurement
Metric
Weight
0.06 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
15 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
28 mm
Outside diameter tolerance
-0.004mm to 0
Width
28 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1814 lbf
Radial static load rating
1170 lbf
Limiting speed
95 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71902 ACE/P4AQBCB Bearing Product Overview & Core Advantages
The 71902 ACE/P4AQBCB is a super-precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. Engineered for the most demanding applications, this bearing delivers exceptional rotational accuracy, high system rigidity, and superior load-carrying capacity. Its P4A tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other precision machinery where minimal runout and vibration are critical. The matched set is pre-lubricated and ready for installation, providing reliable performance out of the box.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation (15mm bore, 28mm OD). |
| ACE | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a super-precision tolerance class for high-accuracy applications. |
| QBC | Signifies a Quadruplex Back-to-Back matched arrangement of four bearings. |
| B | Denotes a Light preload (Class B) for reduced deflection and enhanced rigidity. |
71902 ACE/P4AQBCB Bearing Structural Features & Performance Benefits
- Extreme Rigidity and Stability: The Quadruplex Back-to-Back (QBC) arrangement creates an exceptionally stiff bearing system that minimizes axial and radial deflection under heavy combined loads, crucial for maintaining machining accuracy.
- Superior High-Speed Performance: The phenolic resin cage offers low mass and excellent performance at high rotational speeds, contributing to the bearing's high limiting speed of 95,000 rpm.
- High Load Capacity: The 25° contact angle is optimized to handle significant axial loads in one direction while also supporting substantial radial loads.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring smooth, quiet, and precise operation.
- Ready-to-Install Solution: The matched set is supplied pre-lubricated, simplifying installation and providing immediate, reliable performance within the specified temperature range.
71902 ACE/P4AQBCB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications requiring maximum precision and speed, including:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Mandrels
- High-Speed Robotic Drives
- Advanced Medical and Dental Equipment spindles
- Aerospace Instrumentation and navigation systems
