71928 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71928 CD/P4ADBC
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 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
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In Stock
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71928 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71928 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair is preloaded to Moderate (Class C) specifications, delivering superior system stiffness and minimizing axial and radial runout. Its configuration is engineered to handle combined loads—significant radial loads alongside thrust loads in both directions—making it an ideal solution for high-precision, high-rigidity spindles and machinery.
71928 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
| 71928 | Basic bearing designation indicating a metric, angular contact bearing with a 140mm bore, 190mm OD, and 48mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate thrust capacity. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | Denotes an ultra-precision tolerance class (superior to ABEC 7/ISO P4), ensuring minimal dimensional and running inaccuracies. |
| DB | Specifies the back-to-back mounting arrangement, which provides high moment rigidity and stability. |
| C | Indicates a Moderate preload (Class C), which enhances system stiffness without excessive heat generation. |
71928 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a dynamic load rating of 34,425 lbf and a static load rating of 52,200 lbf, this bearing set is built to withstand demanding operational stresses.
- Optimized High-Speed Performance: The phenolic cage offers low weight and excellent performance at high speeds, contributing to a limiting speed of 11,000 rpm. The 15° contact angle further facilitates high-speed operation.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore and OD tolerances, this bearing ensures minimal vibration and precise running accuracy for critical applications.
- Durable Construction: Components made from chrome steel provide high hardness and wear resistance, ensuring long service life and reliability.
71928 CD/P4ADBC Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads.
- High-Frequency Motors: Used in spindles for PCB drilling and other high-RPM electric motors.
- Precision Gearboxes: In applications requiring minimal backlash and high positional accuracy.
- Industrial Pumps & Compressors: For rotors and shafts in high-speed fluid handling equipment.
