71908 CE/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 CE/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.18 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
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2700 lbf
Limiting speed
56 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
Ceramic
Cage material
Phenolic
Technical Drawings
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71908 CE/HCP4ADGA Bearing Product Overview & Core Advantages
The 71908 CE/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universal matchable (SU) bearing is part of a matched set of 2, enabling simplified mounting and optimal preload configuration. Its core advantages include superior high-speed capabilities with a limiting speed of 56,000 rpm, enabled by its ceramic balls and phenolic cage. The bearing is manufactured to a P4A tolerance class, ensuring extremely tight dimensional and running accuracy for applications where high rigidity
71908 CE/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CE | Indicates the use of Ceramic (Si3N4) balls, which reduce centrifugal forces, lower operating temperature, and enable higher speeds. |
| HC | Refers to the Phenolic (Hybrid Composite) cage, which offers excellent strength-to-weight ratio and is ideal for high-speed operation. |
| P4A | Denotes the tolerance class, specifying very high precision for both dimensional and running accuracy, superior to ABEC 7/ISO P4. |
| DGA | Signifies a Universal Matchable (SU) bearing with an Extra Light (A) preload. Two such bearings can be mounted in a universal arrangement (face-to-face or back-to-back) without selective assembly. |
71908 CE/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and ceramic balls significantly reduces friction and heat generation. This results in a higher limiting speed, extended service life, and improved reliability in high-speed applications.
- Optimized Cage & Lubrication: The lightweight phenolic cage provides high strength with minimal mass, contributing to stability at ultra-high speeds. The bearing comes pre-lubricated for immediate operation within a wide temperature range of -30°C to 110°C.
- High Precision & Rigidity: Manufactured to P4A tolerance class with a 15° contact angle, this bearing delivers exceptional running accuracy and system rigidity, effectively handling combined loads (radial and axial).
- Universal Matchability (SU): As a universal matchable bearing, it simplifies the design and assembly process for spindle units, ensuring consistent and predictable preload when used in pairs.
71908 CE/HCP4ADGA Bearing Typical Application Areas
This high-performance bearing is engineered for the most demanding sectors, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Instrumentation: High-speed measuring devices and laboratory equipment.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units (APUs).
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
