71909 CD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 CD/P4ATBTB
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
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6322 lbf
Radial static load rating
6412 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71909 CD/P4ATBTB Bearing Product Overview & Core Advantages
The 71909 CD/P4ATBTB is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set delivers superior performance in handling combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it ensures minimal runout and high rotational accuracy. The phenolic cage and optimized 15° contact angle contribute to its high-speed capability, making it ideal for high-precision, high-rigidity systems requiring stable operation under demanding conditions.
71909 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD) |
| CD | Contact angle designation (15°) |
| P4A | High precision tolerance class (superior to ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement of three bearings |
71909 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The triplex back-to-back configuration creates an extremely rigid bearing system that minimizes deflection under heavy combined loads, ensuring precise shaft positioning and system stability.
- Optimized Load Capacity: Designed to handle significant radial and axial loads simultaneously, with a radial dynamic load rating of 6322 lbf and static rating of 6412 lbf.
- High-Speed Performance: The phenolic resin cage reduces centrifugal forces and friction, enabling operation at limiting speeds up to 41,000 rpm while maintaining dimensional stability.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal vibration and superior running accuracy for precision applications.
- Premium Materials: Constructed from chrome steel for both rings and balls, providing excellent wear resistance and durability under demanding operating conditions.
71909 CD/P4ATBTB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC milling machines requiring extreme rigidity and accuracy
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus demanding minimal runout
- High-Speed Rotary Systems: Dental handpieces, small precision motors, and specialized drives where speed and accuracy are critical
- Aerospace Components: Guidance systems, gyroscopes, and other precision mechanisms requiring reliable performance under combined loading
