71928 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71928 ACD/P4ADBB
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
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
32850 lbf
Radial static load rating
49500 lbf
Limiting speed
11 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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71928 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71928 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back arrangement is preloaded to Light / Class B specifications, providing superior system stability and stiffness. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed, high-rigidity spindles and other demanding machinery.
71928 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71928 ACD/P4ADBB provides detailed technical specifications:
- 71928: Basic bearing series and size designation (140mm bore, 190mm OD).
- ACD: Angular Contact design in a Duplex Back-to-Back (DB) arrangement.
- P4A: Denotes a super-precision tolerance class, exceeding standard P4 levels for enhanced running accuracy.
- DBB: Confirms the Duplex Back-to-Back mounting configuration of the preloaded set.
71928 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex back-to-back (DB) arrangement and preload create a rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under load.
- Superior Load Capacity: With a 25° contact angle, this bearing is optimized to carry significant combined radial and axial loads. The dynamic load rating of 32,850 lbf and static load rating of 49,500 lbf ensure long service life in demanding conditions.
- High-Speed Performance: The lightweight phenolic resin cage and optimized internal geometry contribute to a high limiting speed of 11,000 rpm, reducing friction and heat generation.
- Precision Operation: Manufactured to a P4A super-precision tolerance with tight dimensional controls on bore, OD, and width, this bearing ensures minimal runout and vibration for ultra-smooth operation.
71928 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is engineered for advanced applications where accuracy and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Robotic Drives.
- High-Frequency Motors and Spindle Drives.
- Medical Equipment and Aerospace Actuators.
