71909 ACD/P4ADGC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 ACD/P4ADGC
Basic Information
System of measurement
Metric
Weight
0.26 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
24 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
4478 lbf
Radial static load rating
4050 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71909 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 71909 ACD/P4ADGC is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial loads in both directions. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other high-performance machinery where high rigidity and operational reliability are paramount.
71909 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71909 ACD/P4ADGC is decoded as follows:
- 71909: Basic series designation for a high-precision, light-weight angular contact ball bearing with a 45mm bore.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Moderate Preload (Class C) applied to the bearing pair.
- /P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and vibration.
- DGC: Specifies a Phenolic (resin) cage and that the bearings are universally matchable (SU) and supplied as a lubricated, pre-set pair.
71909 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double bearing arrangement and 25° contact angle provide superior high rigidity and the ability to support substantial combined radial and axial loads from both directions.
- Precision High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to lower centrifugal forces, enabling a high limiting speed of 41,000 rpm. The P4A tolerance is critical for smooth, low-vibration operation at these speeds.
- Universal Matchability (SU): This feature allows any two bearings from the same lot to be mounted together in any configuration (face-to-face, back-to-back, or tandem) without a performance penalty, offering exceptional design and mounting flexibility.
- Preloaded & Ready-to-Install: The bearings are supplied as a pre-set pair with a moderate preload (Class C), eliminating complex internal clearance calculations and ensuring immediate, optimal stiffness upon installation.
71909 ACD/P4ADGC Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: High-frequency motors and spindles.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation instruments.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
