71917 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71917 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
1.59 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
120 mm
Outside diameter tolerance
-0.004mm to 0
Width
54 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
21060 lbf
Radial static load rating
30825 lbf
Limiting speed
28 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
No drawings available at the moment, will be launched soon
Price:
$ 744.08
/ each
In Stock
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71917 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71917 ACD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a triplex back-to-back (TBT) matched set, it delivers exceptional system rigidity and rotational accuracy. Its key advantages include the ability to handle combined radial and axial loads simultaneously, superior high-speed performance enabled by its phenolic cage, and outstanding operational reliability due to its P4A tolerance class and extra light preload. This configuration is engineered for machine tool spindles and other high-precision machinery where maximum stiffness and precision are non-negotiable.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a super-precision tolerance class, exceeding ABEC 7 standards for running accuracy. |
| TBT | Specifies the bearing is one of three in a Triplex Back-to-Back matched arrangement. |
| A | Denotes an Extra Light preload for minimal friction and optimal high-speed operation. |
71917 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Extreme Rigidity: The triplex back-to-back (TBT) arrangement creates an exceptionally rigid bearing system, capable of resisting complex moment loads and maintaining precise shaft positioning under heavy cutting forces.
- Superior High-Speed Capability: The lightweight phenolic resin cage ensures excellent dimensional stability and low centrifugal forces at high rotational speeds, contributing to a limiting speed of 28,000 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
- Optimized Load Capacity: With a 25° contact angle and robust chrome steel construction, the bearing is engineered to support significant combined radial and axial loads (Dynamic: 21,060 lbf, Static: 30,825 lbf).
- Pre-lubricated for Immediate Operation: The bearing comes lubricated from the factory, ensuring immediate startup and protection during the initial run-in period.
71917 ACD/P4ATBTA Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications requiring the ultimate in speed, rigidity, and accuracy, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for high-RPM applications.
- Aerospace Test Rigs: Equipment requiring ultra-precise rotational components.
