71908 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 ACD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.33 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
5648 lbf
Radial static load rating
5400 lbf
Limiting speed
41 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
Moderate / Class C
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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71908 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71908 ACD/P4ATBTC is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This bearing is supplied as a triplex back-to-back (TBT) matched set, delivering superior stiffness and stability under combined loads (radial and axial). Manufactured to P4A tolerance class and featuring a moderate preload (Class C), it is engineered for high-performance spindles and other precision machinery where high-speed operation and minimal runout are critical.
71908 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Contact Angle of 25°. Optimized for high axial load capacity. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring minimal dimensional variation. |
| TBT | Triplex Back-to-Back arrangement. This matched set of three bearings provides maximum rigidity and moment load resistance. |
| C | Moderate preload applied to the bearing set, reducing deflection and improving system stability. |
71908 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) matched arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is crucial for maintaining precision in machining and high-speed applications.
- High-Speed Capability: The phenolic cage offers low weight and excellent performance at high rotational speeds, contributing to the bearing's high limiting speed of 41,000 rpm. The 25° contact angle provides a balanced performance for both high-speed and axial load requirements.
- Superior Load Capacity: Engineered to handle significant combined radial and axial loads simultaneously. The dynamic load rating of 5648 lbf and static load rating of 5400 lbf ensure reliable operation under demanding conditions.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width. This guarantees consistent, high-precision performance and interchangeability.
71908 ACD/P4ATBTC Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors
- Precision Gearboxes
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
