71902 ACE/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71902 ACE/P4ADBC
Basic Information
System of measurement
Metric
Weight
0.03 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
14 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
1112 lbf
Radial static load rating
585 lbf
Limiting speed
95 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71902 ACE/P4ADBC Bearing Product Overview & Core Advantages
The 71902 ACE/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior high rigidity and the ability to withstand combined loads, including significant radial and bidirectional axial loads. Manufactured to P4A tolerance class with a moderate preload (Class C), it ensures stable performance in high-speed and high-precision environments. Its compact design and phenolic cage contribute to its suitability for precision spindles and other critical machinery.
71902 ACE/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71902 ACE/P4ADBC is decoded as follows:
- 71902: Basic bearing series, indicating a 15mm bore, 28mm OD, and 14mm width.
- ACE: Internal design code specifying contact angle and internal clearance optimized for the DB arrangement.
- P4A: Precision tolerance class exceeding ABEC 7 standards, ensuring minimal runout and vibration.
- DB: Duplex Back-to-Back arrangement, where two bearings are mounted with their back faces together to provide high moment rigidity.
- C: Indicates a moderate preload is applied to the matched set, enhancing stiffness and rotational accuracy.
71902 ACE/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and complex combined loads. The 25° contact angle is optimized for carrying substantial axial loads in both directions.
- High-Speed Performance: The lightweight phenolic cage ensures stable operation and reduced centrifugal forces, enabling a high limiting speed of 95,000 rpm. The bearing comes pre-lubricated for immediate high-speed operation.
- Precision Engineering: Manufactured to a P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, guaranteeing exceptional running accuracy and system consistency.
- Material Quality: Components made from high-grade chrome steel provide excellent durability and fatigue resistance under high dynamic loads (1112 lbf dynamic rating).
71902 ACE/P4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where precision and rigidity are paramount, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
- Robotic Arm Joints and Precision Gearboxes
