71909 ACDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 ACDGC/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
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
2025 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
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 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71909 ACDGC/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and moderate preload. Operating under the P4A tolerance class, it guarantees exceptional dimensional accuracy and running precision. Its defining characteristic is the 25° contact angle, which provides superior performance in handling combined radial and axial loads. Manufactured with a phenolic cage and high-grade chrome steel components, this bearing is optimized for high-speed operation up to 41,000 rpm, making it an ideal choice for high-rigidity, precision spindle systems.
71909 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71909 ACDGC/P4A provides detailed technical specifications. Here is a breakdown:
- 71909: The basic series designation for a high-precision, single-row angular contact ball bearing.
- AC: Signifies Angular Contact design with a 25° contact angle.
- D: Indicates a Moderate Preload (Class C).
- GC: Represents specific internal clearance and preload parameters for optimal performance.
- P4A: Denotes an extremely high tolerance class, exceeding ABEC 7 standards, for superior dimensional and running accuracy.
71909 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row design with a 25° contact angle and moderate preload provides excellent shaft positioning accuracy and system stiffness, minimizing deflection under load.
- Superior Load Capacity: Engineered to support combined loads effectively. It has a dynamic load rating of 2790 lbf and a static load rating of 2025 lbf.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the precision-ground chrome steel balls and raceways contribute to smooth operation at the limiting speed of 41,000 rpm.
- Universal Matching Capability (SU): This bearing is Universal Matchable and can be supplied in sets of three (Number of bearings in matched set: 3), allowing for precise preload configuration in duplex or triplex arrangements for enhanced rigidity.
71909 ACDGC/P4A Bearing Typical Application Areas
The 71909 ACDGC/P4A is ideally suited for high-performance machinery requiring high rotational accuracy and speed. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors and generators.
- Medical Equipment: High-speed rotors in dental handpieces and centrifuges.
