71928 CD/P4ADFD
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71928 CD/P4ADFD
Basic Information
System of measurement
Metric
Weight
3.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.004mm to 0
Width
48 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
34425 lbf
Radial static load rating
52200 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Face-to-Face (DF)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71928 CD/P4ADFD Bearing Product Overview & Core Advantages
The 71928 CD/P4ADFD is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This face-to-face (DF) matched arrangement provides superior stability under combined loads, handling significant radial and bidirectional axial forces simultaneously. Manufactured to P4A tolerance class and featuring a heavy preload (Class D), it delivers high running accuracy and is ideally suited for high-precision, high-rigidity systems. The open design allows for custom lubrication schemes to optimize performance.
71928 CD/P4ADFD Bearing Model Code Explained, Specifications & Naming Convention
The model number 71928 CD/P4ADFD is decoded as follows:
- 71928: Basic bearing designation (Metric series, 140mm bore, 190mm OD).
- C: 15° contact angle, offering a balanced capacity for radial and axial loads.
- D: Indicates a heavy preload (Class D) for maximum system rigidity.
- P4A: Denotes a super-precision tolerance class, ensuring extremely tight dimensional and running accuracy.
- DF: Specifies the bearing set is in a Duplex Face-to-Face arrangement.
- D: (Second occurrence) Reiterates the heavy preload condition for the matched set.
71928 CD/P4ADFD Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex face-to-face (DF) configuration and heavy preload create an exceptionally stiff bearing system that minimizes axial and radial deflection under load, crucial for maintaining precision.
- Superior Load Capacity: Engineered with a 15° contact angle and robust construction, this bearing effectively supports combined radial and bidirectional axial loads. Its high dynamic and static load ratings ensure long-term reliability in demanding applications.
- Precision Performance: Manufactured to P4A super-precision standards with tight tolerances on all dimensions, it guarantees high running accuracy and low vibration levels.
- Optimized Components: The phenolic resin cage offers low weight and excellent performance at high speeds, while the chrome steel rings and balls provide high durability and wear resistance.
71928 CD/P4ADFD Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, rigidity, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motor Spindles.
- Industrial Pumps and Compressors requiring high axial stiffness.
- Robotic Arm Joints and Rotary Tables.
- Other precision rotary equipment in aerospace, medical, and semiconductor manufacturing.
