71940 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71940 CD/P4ADBC
Basic Information
System of measurement
Metric
Weight
12.2 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
280 mm
Outside diameter tolerance
-0.004mm to 0
Width
76 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
76050 lbf
Radial static load rating
119250 lbf
Limiting speed
6.3 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
No drawings available at the moment, will be launched soon
In Stock
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71940 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71940 CD/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 is preloaded to provide high rigidity and superior stability under combined loads, including radial and axial forces. Manufactured to P4A tolerance class, it ensures minimal runout and is ideal for high-speed, high-precision machinery where reliability is paramount. Its compact design integrates two bearings into a single, matched unit for simplified installation and optimal performance.
71940 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71940 CD/P4ADBC breaks down as follows:
- 71940: Basic series designation for a high-precision angular contact ball bearing.
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Indicates the bearing is part of a duplex pair.
- P4A: Specifies the tolerance class, indicating very high precision with strict limits on dimensional and running accuracy.
- DB: Defines the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and stability.
- C: Indicates a Moderate Preload (Class C) is applied to the matched set.
71940 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement and moderate preload create a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning.
- Superior Load Capacity: Engineered to handle combined radial and axial loads simultaneously. The 15° contact angle provides an excellent balance for these loads.
- High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to lower friction and enable a high limiting speed of 6,300 rpm.
- Precision Performance: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances, guaranteeing smooth, quiet, and vibration-free operation essential for precision applications.
- Durable Construction: Made from chrome steel for both rings and balls, ensuring high durability and long service life under demanding conditions.
71940 CD/P4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where precision and rigidity are critical, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
