71809 ACD/P4TBTL
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71809 ACD/P4TBTL
Basic Information
System of measurement
Metric
Weight
0.12 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
58 mm
Outside diameter tolerance
-0.004mm to 0
Width
21 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2239 lbf
Radial static load rating
3375 lbf
Limiting speed
46 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
Available
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
Price available upon request.
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71809 ACD/P4TBTL Bearing Product Overview & Core Advantages
The 71809 ACD/P4TBTL is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set consists of three bearings arranged in a Triplex Back-to-Back (TBT) configuration, providing superior stability and the ability to withstand combined loads (radial and axial). Manufactured to P4 tolerance class, it delivers high running accuracy and is preloaded for immediate, high-stiffness operation, making it ideal for high-precision, high-rigidity spindles and systems.
71809 ACD/P4TBTL Bearing Model Code Explained, Specifications & Naming Convention
The model number 71809 ACD/P4TBTL reveals its technical specifications through standardized suffixes:
- 71809: Basic bearing series and size designation (45mm bore, 58mm OD).
- ACD: Angular Contact design with a 25° contact angle.
- P4: Denotes a high-precision tolerance class for exceptional running accuracy.
- TBTL: Specifies a Triplex Back-to-Back (TBT) matched set of three bearings, preloaded for maximum system rigidity.
71809 ACD/P4TBTL Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Triplex Back-to-Back (TBT) arrangement of three bearings creates an extremely rigid support system, capable of handling significant combined radial and axial loads from multiple directions.
- Precision Performance: Built to P4 tolerance class with a 25° contact angle, this bearing ensures minimal runout and high positional accuracy, which is critical for high-speed applications.
- Optimized High-Speed Operation: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and enabling a high limiting speed of 46,000 rpm. The bearing is supplied lubricated for immediate operation.
- Durable Construction: Components made from chrome steel provide high fatigue life and durability, ensuring reliable performance within a temperature range of -30°C to 110°C.
71809 ACD/P4TBTL Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors and Robotic Drives.
- Other precision equipment requiring matched bearing sets for uncompromising accuracy and stiffness.
