71908 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 ACD/P4ATBTB
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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71908 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71908 ACD/P4ATBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This triplex back-to-back (TBT) matched set delivers superior performance in handling combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class with a light preload (Class B), it ensures minimal runout and high rotational accuracy. Its compact design and phenolic cage contribute to stable operation at high speeds, making it an ideal solution for high-precision, high-reliability machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 36mm width) |
| ACD | Angular Contact design with a 25° contact angle |
| P4A | High precision tolerance class for superior running accuracy |
| TBT | Triplex Back-to-Back matched arrangement of three bearings |
71908 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back (TBT) configuration provides exceptional system stiffness, enabling the bearing set to withstand significant combined radial and axial loads. The 25° contact angle is optimized for axial load carrying capacity.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing ensures minimal vibration and high running accuracy. The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 41,000 rpm.
- Optimized for Precision Applications: The light preload (Class B) eliminates internal clearance, reducing deflection under load and enhancing positional accuracy for the spindle or shaft.
- Durable Construction: Components made from chrome steel offer high hardness and wear resistance, ensuring long service life under demanding operating conditions.
71908 ACD/P4ATBTB Bearing Typical Application Areas
This high-precision triplex bearing set is ideally suited for applications requiring high rigidity, speed, and accuracy, including:
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- High-Frequency Motor Spindles
