71906 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71906 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
0.14 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
30 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
47 mm
Outside diameter tolerance
-0.004mm to 0
Width
27 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3285 lbf
Radial static load rating
2902 lbf
Limiting speed
83 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
In Stock
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71906 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71906 ACD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding applications. This metric bearing is supplied as a triplex back-to-back (TBT) matched set, delivering exceptional system rigidity and the ability to handle complex combined loads (radial and axial). Manufactured to the stringent P4A tolerance class, it guarantees ultra-high running accuracy, making it ideal for high-speed spindles and other precision machinery requiring maximum performance and reliability.
71906 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71906 ACD/P4ATBTA provides a complete technical description:
- 71906: Denotes the basic bearing series and size (30mm bore, 47mm OD).
- ACD: Signifies a 25° contact angle, optimized for supporting high axial loads.
- P4A: Indicates an extra-light preload (Class A) and a super-precision tolerance class for minimal runout and vibration.
- TB: Stands for Back-to-Back mounting arrangement.
- T: Specifies that the bearings are supplied as a Triplex (3-bearing) matched set.
- A: Confirms the Universal matching is not applicable; this is a standard, pre-matched set.
71906 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Load Capacity: The triplex back-to-back configuration creates an extremely rigid bearing system, capable of withstanding heavy combined radial and axial loads from both directions. The 25° contact angle is specifically engineered for superior axial load carrying capacity.
- Super-Precision Performance: Built to ABEC 7 / P4A tolerance standards, this bearing ensures ultra-high rotational accuracy and minimal thermal growth, which is critical for maintaining precision in high-speed applications.
- Optimized for High Speeds: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 83,000 rpm. The bearings are pre-lubricated for immediate operation.
- Robust Construction: Manufactured from high-grade chrome steel for both rings and balls, ensuring long service life and durability under demanding conditions.
71906 ACD/P4ATBTA Bearing Typical Application Areas
This high-precision bearing set is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Where extreme rotational accuracy and speed are required.
- Medical Equipment: Dental handpieces and other high-speed medical tools.
