71908 ACB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71908 ACB/P4A
Basic Information
System of measurement
Metric
Weight
0.12 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.007mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
28
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1141 lbf
Radial static load rating
878 lbf
Limiting speed
43 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
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:
$ 314.46
/ each
In Stock
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71908 ACB/P4A Bearing Product Overview & Core Advantages
The 71908 ACB/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate combined loads, it efficiently handles significant radial loads and unidirectional axial loads simultaneously. Its P4 (ABEC-7) tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and precision machinery. The phenolic resin cage and optimized 25° contact angle contribute to its high-speed capability and operational stability.
71908 ACB/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71908 ACB/P4A is decoded as follows:
- 71908: Basic series designation for a high-precision, light-series angular contact ball bearing.
- AC: Angular Contact design, optimized for combined loads.
- B: Denotes a 40° contact angle (Note: Specification sheet indicates 25°, please verify application requirements).
- P4A: Indicates a P4 tolerance class with specific internal clearance and geometric accuracy per ABEC-7 standards.
71908 ACB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class, this bearing provides exceptional dimensional stability and running accuracy, minimizing vibration and ensuring precise shaft positioning.
- Optimized Load Capacity: The 25° contact angle and robust chrome steel construction enable high radial dynamic load rating (1141 lbf) and effective management of combined radial and axial loads.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, allowing a high limiting speed of 43,000 rpm. The open design facilitates efficient lubrication and cooling.
- Pre-Loaded Configuration: The bearing is supplied with a preload, enhancing system stiffness and rotational accuracy for demanding applications.
71908 ACB/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for:
- Machine Tool Spindles
- High-Speed Grinding and Milling Heads
- Precision Medical and Dental Equipment
- High-Frequency Motors and Spindles
- Aerospace Instrumentation and Actuators
