71928 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71928 ACD/P4ADBA
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
Extra light / Class A
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/P4ADBA Bearing Product Overview & Core Advantages
The 71928 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Extra light (Class A) specifications, ensuring minimal axial and radial play for superior running accuracy. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it an ideal choice for high-precision, high-rigidity spindles and other critical machinery components.
71928 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing series and size designation (140mm bore, 190mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a Duplex (two-bearing) set. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC 7/ISO P4). |
| DB | Denotes the Back-to-Back mounting arrangement of the duplex pair. |
| A | Specifies the Extra light preload (Class A) applied to the set. |
71928 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The duplex back-to-back (DB) configuration creates a rigid, moment-resisting support system. Combined with the P4A precision tolerance and controlled preload, this structure ensures exceptional shaft positioning accuracy and minimal deflection under load.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to efficiently support combined radial and axial loads from both directions simultaneously.
- High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces, while the open design and factory lubrication contribute to stable operation at high rotational speeds, with a limiting speed of 11,000 rpm.
- Durable Construction: Manufactured from high-grade chrome steel for both rings and balls, this bearing offers high fatigue life and reliability. The precise bore diameter and outside diameter tolerances guarantee consistent performance and easy installation.
71928 ACD/P4ADBA Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal, external, and surface grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Robotic Drives: Precision joints and actuators requiring high rigidity.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
