71910 ACE/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71910 ACE/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.26 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
50 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
72 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4478 lbf
Radial static load rating
3668 lbf
Limiting speed
46 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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71910 ACE/P4ADBB Bearing Product Overview & Core Advantages
The 71910 ACE/P4ADBB is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of a matched duplex pair in a back-to-back (DB) arrangement, this bearing is preloaded to deliver superior system stability and handle combined loads (radial and axial) simultaneously. Manufactured to the stringent P4A tolerance class, it is the ideal solution for high-speed spindles and other precision machinery where minimal runout and high operational reliability are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71910 | Bearing series and size designation (10mm bore x 72mm OD x 24mm width). |
| ACE | Designates a 25° contact angle and optimized internal geometry for high-speed performance. |
| P4A | Indicates a super-precision tolerance class (equivalent to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DB | Specifies a Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and accommodates axial loads in both directions. |
| B | Denotes a specific Light preload applied to the matched set, reducing axial and radial play for enhanced system stiffness. |
71910 ACE/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread of the load-carrying balls, significantly increasing the bearing's resistance to moment loads and improving overall system stiffness.
- Superior Precision & Running Accuracy: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing ensures minimal vibration and precise shaft positioning.
- Optimized High-Speed Performance: The 25° contact angle and phenolic resin cage are engineered for stable operation at high rotational speeds, with a limiting speed of 46,000 rpm. The lightweight cage reduces centrifugal forces and ensures reliable guidance.
- High Load Capacity: With a dynamic load rating of 4478 lbf and a static load rating of 3668 lbf, the bearing is capable of handling significant combined radial and axial loads.
- Pre-Lubricated for Immediate Use: The bearing comes lubricated from the factory, ready for installation and initial operation within its specified temperature range.
71910 ACE/P4ADBB Bearing Typical Application Areas
The 71910 ACE/P4ADBB is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robots, indexing tables, and rotary actuators.
- High-Frequency Motors & Spindles: Applications requiring minimal runout and high rotational accuracy.
- Medical & Laboratory Equipment: Centrifuges and other precision instruments.
