71938 ACDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71938 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
4.35 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
190 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
260 mm
Outside diameter tolerance
-0.004mm to 0
Width
33 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
36675 lbf
Radial static load rating
46800 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
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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71938 ACDGB/P4A Bearing Product Overview & Core Advantages
The 71938 ACDGB/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, it delivers superior running precision. Its key advantage lies in its ability to accommodate combined loads—simultaneously handling significant radial loads and axial loads in one direction. The light preload (Class B) minimizes deflection under operational forces, ensuring high system stiffness and precise shaft positioning, making it ideal for high-reliability, high-performance machinery.
71938 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| GB | Indicates a universal matchable bearing. Two bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to handle bidirectional axial loads. |
| P4A | Denotes a super-precision tolerance class with enhanced dimensional and running accuracy, suitable for the most demanding high-speed and high-rigidity applications. |
71938 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The optimized 25° contact angle and robust construction enable the bearing to support high combined loads. The phenolic cage ensures dimensional stability under high centrifugal forces.
- Precision & High-Speed Performance: Manufactured to P4A tolerances with a limiting speed of 11,000 rpm, this bearing guarantees smooth, low-vibration operation essential for high-speed spindles.
- Optimized Internal Geometry: Featuring 28 precision balls of 22.225 mm diameter, the design minimizes friction and heat generation, contributing to its high-speed capability and long service life.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, it simplifies the assembly of preloaded bearing sets, ensuring optimal performance and ease of installation in matched arrangements.
71938 ACDGB/P4A Bearing Typical Application Areas
This precision angular contact bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads requiring high rigidity and accuracy.
- High-Speed Drives: In applications such as turbochargers and precision gearboxes.
- Precision Instrumentation: Used in high-speed measuring and testing equipment.
- Aerospace & Defense Systems: Where reliability and performance under extreme conditions are critical.
