71903 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71903 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.034 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
30 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
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1462 lbf
Radial static load rating
900 lbf
Limiting speed
103 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71903 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71903 ACD/P4ADBB is a precision angular contact ball bearing supplied as a duplex back-to-back (DB) matched set. This configuration is engineered to provide exceptional rigidity and stability, making it ideal for applications requiring high rotational accuracy and the ability to withstand combined loads (radial and axial). With a P4A tolerance class and a light preload (Class B), it delivers superior running precision and is optimized for high-speed operation up to 103,000 rpm.
Model Code Breakdown
The model number 71903 ACD/P4ADBB is decoded as follows:
- 71903: Basic bearing series, indicating a metric, angular contact design with a 17mm bore, 30mm OD, and 14mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a Duplex (two bearings in a set) configuration.
- DB: Specifies the Back-to-Back mounting arrangement of the duplex set.
- P4A: Denotes an ultra-precision tolerance class, exceeding ABEC 7 standards, ensuring minimal runout and vibration.
- Open / Lubricated: The bearing is supplied open (unsealed) and pre-lubricated for immediate use.
71903 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively counters moment loads and shaft deflection, crucial for precision machining and high-speed spindles.
- Superior Load Capacity: The 25° contact angle and robust construction enable the bearing to handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed. The standard pre-lubrication ensures immediate and smooth operation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, guaranteeing exceptional running accuracy and consistency.
71903 ACD/P4ADBB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Motors
- Medical and Dental Handpiece Drives
- Aerospace Instrumentation
