71912 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71912 ACD/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.38 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.004mm to 0
Width
26 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6795 lbf
Radial static load rating
6525 lbf
Limiting speed
33 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
No drawings available at the moment, will be launched soon
In Stock
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71912 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71912 ACD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a duplex back-to-back (DB) matched pair with an Extra Light (A) preload, this bearing is engineered to provide superior stability under combined loads, handling significant radial and axial loads simultaneously. Manufactured to the stringent P4A tolerance class, it ensures minimal runout and is ideal for high-speed, high-precision machinery where uncompromising performance is critical.
71912 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing designation, indicating a metric, angular contact bearing series with a 60 mm bore, 85 mm OD, and 26 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a Duplex (two bearings supplied as a set). |
| P4A | Specifies the high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DB | Specifies the Back-to-Back mounting arrangement of the duplex pair, which provides high moment rigidity. |
| A | Denotes an Extra Light preload applied to the matched set, minimizing deflection at high speeds. |
71912 ACD/P4ADBA 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, making it exceptionally stable under combined radial and axial loads.
- Optimized for High-Speed Operation: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction, reduced heat generation, and a high limiting speed of 33,000 rpm. The 25° contact angle provides an optimal balance between radial and axial load capacity for high-speed applications.
- Precision Performance: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing ensures precise shaft positioning, low vibration, and smooth operation essential for precision machinery.
- Superior Load Capacity: With a dynamic load rating of 6795 lbf and a static load rating of 6525 lbf, the bearing is built to handle significant loads over a long service life.
- Material Integrity: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and durability.
71912 ACD/P4ADBA Bearing Typical Application Areas
The 71912 ACD/P4ADBA is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads.
- High-Speed Motors and Spindles: In applications requiring precise rotational accuracy at very high RPM.
- Precision Gearboxes and Transmission Systems
- Medical and Laboratory Equipment: Such as high-speed centrifuges.
- Aerospace and Defense Actuation Systems
