S71905 ACEGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71905 ACEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.042 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1141 lbf
Radial static load rating
596 lbf
Limiting speed
83 X 1000 rpm
Lubrication
Grease
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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S71905 ACEGA/P4A Bearing Product Overview & Core Advantages
The S71905 ACEGA/P4A is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. As a single bearing from a universally matchable (SU) pair, it excels in handling combined loads, offering high rigidity and superior running accuracy. Its compact design, featuring a 9 mm width, makes it ideal for space-constrained, high-speed spindles and other precision machinery where reliability is paramount.
S71905 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Benefit |
|---|---|---|
| ACEGA | Contact Angle: 25°, Extra Light Preload (Class A), Universal Matchable | Optimized for high-speed operation with minimal friction and heat generation. Allows for precise axial positioning when paired. |
| P4A | High-Precision Tolerance Class (Superior to ABEC 7) | Ensures extremely low runout and vibration for superior application performance and finish. |
S71905 ACEGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: Manufactured to P4A tolerance with a 25° contact angle, this bearing provides exceptional dimensional stability and minimizes deflection under load, which is critical for high-precision applications.
- Superior High-Speed Capability: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and enabling a high limiting speed of 83,000 rpm. The extra light preload (Class A) further reduces friction and heat build-up.
- Optimized Load Capacity: With a radial dynamic load rating of 1141 lbf, it is engineered to handle significant combined radial and axial loads simultaneously.
- Sealed and Pre-Lubricated: The sealed design with grease lubrication protects against contamination and provides long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S71905 ACEGA/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Instrumentation
- High-Frequency Motors
- Medical and Dental Equipment
- Other applications requiring high rigidity, high speed, and supreme accuracy.
