71909 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 ACD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.39 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
36 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
5962 lbf
Radial static load rating
6075 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
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/P4ATBTC Bearing Product Overview & Core Advantages
The 71909 ACD/P4ATBTC is a precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing set is designed to accommodate combined radial and axial loads simultaneously. Manufactured to a P4A tolerance class with a 25° contact angle and a moderate preload (Class C), it delivers high running accuracy, excellent stability, and superior system rigidity, making it ideal for high-performance spindles and precision machinery.
71909 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71909 ACD/P4ATBTC is decoded as follows:
- 71909: Basic series designation for a high-precision, light-series angular contact ball bearing.
- A: Denotes a 25° contact angle, optimized for high axial load capacity.
- C: Indicates the bearing is supplied with a moderate preload (Class C).
- D: Signifies that the bearings are universally matched for precise alignment and load distribution.
- /P4A: Specifies the tolerance class P4A, indicating very high dimensional and running accuracy.
- TBT: Designates the Triplex Back-to-Back arrangement of the three bearings in the set.
- C: Identifies the cage material as Phenolic, suitable for high-speed operation.
71909 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system capable of supporting significant combined radial and axial loads from both directions, ensuring minimal deflection under load.
- Precision Performance: Manufactured to P4A tolerance class standards, these bearings guarantee exceptional dimensional stability and running accuracy, which is critical for applications like machine tool spindles.
- Optimized High-Speed Operation: The lightweight phenolic cage reduces centrifugal forces, enabling higher limiting speeds. The standard lubrication and optimized internal geometry contribute to stable performance at the specified limiting speed of 41,000 rpm.
- Matched Set Consistency: As a pre-matched set of three bearings, the 71909 ACD/P4ATBTC ensures consistent preload and performance, simplifying installation and guaranteeing system reliability.
71909 ACD/P4ATBTC Bearing Typical Application Areas
This bearing set is predominantly used in high-precision, high-speed applications where maximum rigidity and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, engraving machines, and other high-speed automated equipment.
- High-Frequency Motors and Turbochargers.
- Medical Equipment: Such as high-speed dental handpieces and centrifuges.
