71920 FEGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 FEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.77 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
18 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8775 lbf
Radial static load rating
6975 lbf
Limiting speed
16 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71920 FEGA/P4A Bearing Product Overview & Core Advantages
The 71920 FEGA/P4A is a single-row angular contact ball bearing engineered for ultra-precision applications requiring exceptional rotational accuracy and high-speed capability. Manufactured to P4A tolerance class, this bearing delivers superior dimensional stability and minimal runout. Its 18° contact angle is optimized to handle significant combined loads (radial and axial) simultaneously. The universal matching (SU) design allows for flexible mounting configurations in preloaded sets, ensuring optimal system rigidity and performance in demanding machinery.
71920 FEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing designation: High-precision angular contact bearing series with 100mm bore, 140mm OD, 20mm width. |
| FE | Machined phenolic resin cage design, providing excellent strength-to-weight ratio and reduced friction at high speeds. |
| GA | Contact angle of 18° and Extra Light (A) preload for high-speed operation with minimal deflection. |
| P4A | Ultra-precision tolerance class exceeding ABEC 7 standards, ensuring exceptional dimensional and running accuracy. |
71920 FEGA/P4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The lightweight phenolic cage (FE) and optimized 18° contact angle enable stable operation at limiting speeds up to 16,000 rpm, reducing centrifugal forces and heat generation.
- Exceptional Rigidity & Load Capacity: Manufactured from chrome steel with precision-ground raceways, this bearing provides high radial dynamic load rating (8,775 lbf) and static load rating (6,975 lbf), maintaining accuracy under combined loading conditions.
- Precision Engineering: P4A tolerance class guarantees tight dimensional control (bore/OD tolerance: -0.004mm to 0), resulting in minimal vibration and superior positional accuracy in spindle applications.
- Universal Matching Capability (SU): Bearings can be mounted in preloaded pairs or sets without selective matching, simplifying installation and ensuring consistent system stiffness.
71920 FEGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines requiring ultra-precision rotation.
- Precision Instrumentation: Measuring equipment, optical scanners, and laboratory apparatus demanding minimal runout and thermal stability.
- High-Speed Drives: Electric motor spindles, turbochargers, and aerospace actuators where combined load capacity and high rotational speeds are critical.
- Robotics & Automation: Precision joints, rotary tables, and indexing heads in automated manufacturing systems.
