71912 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71912 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
0.57 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
39 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
9068 lbf
Radial static load rating
9900 lbf
Limiting speed
33 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
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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71912 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71912 ACD/P4ATBTA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a matched triplex back-to-back (TBT) set, this bearing is engineered to handle combined loads—significant radial and axial loads in both directions—simultaneously. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other critical machinery where high rigidity and minimal runout are paramount. The phenolic cage and optimized 25° contact angle contribute to its superior high-speed performance and operational stability.
71912 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71912 ACD/P4ATBTA provides a detailed technical specification. Below is a breakdown of its components:
- 71912: Basic model number denoting a metric, single-row angular contact ball bearing with a 60mm bore, 85mm OD, and 39mm width.
- ACD: Signifies Angular Contact design with a 25° contact angle.
- P4A: Indicates an ultra-precision tolerance class exceeding ABEC 7 (P4) standards, with additional specifications for running accuracy.
- TB: Denotes the bearing is part of a Triplex Back-to-Back (TBT) matched set.
- T: Specifies the cage material is Phenolic (Textolite), ideal for high-speed applications.
- A: Designates an Extra Light preload within the matched set for optimal rigidity and minimal deflection under load.
71912 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The triplex back-to-back arrangement of three bearings creates a highly rigid system capable of withstanding heavy combined radial and axial loads from both directions, making it exceptionally stable under complex loading conditions.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the 25° contact angle provides an excellent balance between axial load capacity and speed capability, achieving a limiting speed of 33,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional control (bore and OD tolerance: -0.004mm to 0) and superior running accuracy, which is critical for applications like machine tool spindles.
- Optimized Material Selection: The use of chrome steel for both rings and balls ensures high durability and fatigue resistance, contributing to a long operational life under demanding conditions.
71912 ACD/P4ATBTA Bearing Typical Application Areas
This high-precision bearing is specifically designed for advanced industrial and manufacturing equipment, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM applications.
- Advanced Robotics: Critical joints and arms requiring high accuracy and rigidity.
