71908 ACE/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 ACE/P4ADGA
Basic Information
System of measurement
Metric
Weight
0.2 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
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3398 lbf
Radial static load rating
2565 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71908 ACE/P4ADGA Bearing Product Overview & Core Advantages
The 71908 ACE/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, it delivers superior running accuracy and dimensional stability. Its universal matchable (SU) design allows for flexible mounting in various preload configurations, while the extra light preload (Class A) minimizes friction and heat generation, making it ideal for high-speed spindles and other precision machinery where low torque and high rigidity are critical.
71908 ACE/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width) |
| ACE | Designates a 25° contact angle and specific internal design optimized for high-speed operation |
| P4A | Indicates super-precision tolerance class (equivalent to ABEC 7), ensuring extremely tight dimensional and running accuracy |
| DGA | Signifies the bearing is universal matchable (SU) and comes pre-lubricated with high-performance grease |
71908 ACE/P4ADGA Bearing Structural Features & Performance Benefits
- High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio and reduced friction, contributing to the high limiting speed of 41,000 rpm. Combined with the optimized 25° contact angle, it ensures stable operation at extreme rotational velocities.
- Exceptional Rigidity and Accuracy: Manufactured to P4A tolerance standards with extremely tight dimensional tolerances on the bore, outside diameter, and width. This results in superior running accuracy, minimal vibration, and precise shaft positioning, which is critical for machine tool spindles.
- Universal Matching Design (SU): This feature allows two bearings to be mounted in a back-to-back, face-to-face, or tandem arrangement without selective matching, providing design flexibility to achieve the desired preload and stiffness for the application.
- Optimized Load Capacity: The bearing is engineered to support combined loads, effectively handling both radial and axial forces. The dynamic load rating of 3398 lbf and static load rating of 2565 lbf ensure reliable performance under demanding conditions.
71908 ACE/P4ADGA Bearing Typical Application Areas
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors
- Aerospace Control Systems
- Medical and Dental Handpiece Drives
- Test and Measurement Equipment
