71908 FEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 FEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.088 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
12 mm
Width tolerance
-0.2mm to 0
Contact angle
18 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2194 lbf
Radial static load rating
1350 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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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In Stock
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71908 FEGA/HCP4A Bearing Product Overview & Core Advantages
The 71908 FEGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and speed capability. This single bearing features an Extra Light (A) preload and is manufactured to P4A tolerance class, ensuring minimal runout and superior performance. Its ceramic balls and phenolic cage contribute to lower friction, higher limiting speeds, and extended service life, making it ideal for high-speed spindles and precision machinery.
71908 FEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| FE | Ferritic Steel Cage (Note: Specs indicate Phenolic) | Historically denotes a lightweight, high-speed cage design. |
| GA | Universal Matchable (SU) bearing in a set | Allows for flexible mounting arrangements (DB, DF, DT) with other universal match bearings. |
| HC | Hybrid Ceramic (Silicon Nitride balls) | Enables higher limiting speeds, reduced heat generation, and longer life. |
| P4A | High Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for superior performance. |
71908 FEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls (Si3N4) significantly reduces centrifugal forces, allowing for a limiting speed of 41,000 rpm. This construction also provides electrical insulation and superior performance in lubricant-starved conditions.
- Precision Ground & Preloaded: Manufactured to P4A tolerance class with an Extra Light (A) preload, this bearing delivers high running accuracy, minimal deflection, and rapid system response, which is critical for high-precision applications.
- Optimized Cage Design: The phenolic resin cage is lightweight and exhibits excellent sliding properties, contributing to low torque, low heat generation, and stable operation at high speeds.
- Angular Contact Design: With a 15° contact angle, the bearing is engineered to support combined loads, efficiently handling substantial axial loads in one direction alongside radial loads.
71908 FEGA/HCP4A Bearing Typical Application Areas
The 71908 FEGA/HCP4A is engineered for high-performance machinery where speed, precision, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Dental & Medical Handpieces: Requiring very high RPM and smooth operation.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Aerospace Instrumentation: Gyroscopes and other precision navigation systems.
