71909 ACEGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 ACEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.13 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2194 lbf
Radial static load rating
1440 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71909 ACEGA/P4A Bearing Product Overview & Core Advantages
The 71909 ACEGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with Universal Matchable (SU) designation, it can be flexibly paired to form precisely matched sets. Its core advantages include handling combined loads (radial and axial) efficiently due to its 25° contact angle, achieving high rigidity, and operating at very high speeds thanks to its P4A tolerance class and phenolic cage. This makes it ideal for high-precision, high-reliability spindles and machinery.
71909 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| E | Optimized internal design for high capacity and speed. |
| GA | Specifies a Universal Matchable (SU) bearing with an Extra light (A) preload. |
| /P4A | Denotes a super-precision tolerance class with running accuracy better than ABEC 7. |
71909 ACEGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. This ensures minimal runout and superior positional accuracy in the application.
- Optimized Load Capacity: The 25° contact angle and enhanced internal geometry (E-design) provide excellent performance under combined radial and axial loads.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open seal type minimizes friction, collectively enabling a high limiting speed of 41,000 rpm.
- Universal Matching Capability (SU): As a Universal Matchable bearing, individual 71909 ACEGA/P4A bearings can be universally paired in any combination to form duplex sets (DB, DF, DT) without pre-selection, simplifying inventory and assembly.
71909 ACEGA/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arm assemblies.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
