71905 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
0.13 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 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
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3105 lbf
Radial static load rating
2565 lbf
Limiting speed
53 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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71905 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71905 ACD/P4ATBTA is a metric system, ultra-precision angular contact ball bearing designed for the most demanding applications. Its primary advantage lies in its triplex back-to-back (TBT) matched arrangement, which provides exceptional system rigidity and stability. Manufactured to a P4A tolerance class and featuring an extra light preload (Class A), this bearing is engineered to deliver superior running accuracy, handle combined loads efficiently, and operate at high speeds, making it an ideal choice for high-precision spindles and machinery.
71905 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 27mm width). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates an ultra-high precision tolerance class, exceeding ABEC 7 standards, with specific running accuracy requirements. |
| TB | Denotes a Back-to-Back matched bearing arrangement. |
| TA | Specifies the preload code for Extra Light (Class A) preload. |
71905 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Triplex Back-to-Back (TBT) Arrangement: The use of three bearings in a back-to-back configuration creates a wide effective spread, significantly increasing moment rigidity and system stability, which is critical for minimizing deflection under heavy combined loads.
- High-Precision & Preload: The P4A tolerance class ensures minimal runout and vibration. The extra light preload (Class A) eliminates internal clearance, enhancing positional accuracy and providing consistent performance at high speeds.
- Optimized Internal Geometry: With a 25° contact angle, this bearing is optimized to handle substantial axial loads in one direction while supporting radial loads. The phenolic cage contributes to smooth operation and is suitable for high-speed applications.
- Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life under demanding conditions.
- High-Speed Capability: The combination of precision, light preload, and a phenolic cage allows for a high limiting speed of 53,000 rpm, making it a true high-speed bearing.
71905 ACD/P4ATBTA Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery requiring extreme precision and rigidity. Key applications include:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Robotic Drives and Actuators
- High-Speed Dental and Medical Handpieces
- Aerospace Control Systems and Instrumentation
- Advanced Testing and Measurement Equipment
