71821 CD/P4TBTM
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71821 CD/P4TBTM
Basic Information
System of measurement
Metric
Weight
0.96 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
130 mm
Outside diameter tolerance
-0.004mm to 0
Width
39 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
35
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
11115 lbf
Radial static load rating
20250 lbf
Limiting speed
16 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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71821 CD/P4TBTM Bearing Product Overview & Core Advantages
The 71821 CD/P4TBTM is a precision angular contact ball bearing supplied as a triplex matched set in a back-to-back (TBT) arrangement. Engineered for exceptional performance in demanding applications, it features a P4 tolerance class for superior running accuracy and is preloaded for immediate operational readiness. This configuration is specifically designed to handle combined loads (radial and axial) with high system rigidity and stability, making it ideal for high-precision spindles and machinery requiring uncompromising accuracy.
71821 CD/P4TBTM Bearing Model Code Explained, Specifications & Naming Convention
- 71821: Basic bearing designation, indicating a 105 mm bore, 130 mm OD, and angular contact design.
- CD: Signifies a triplex matched set with specific preload and universal matching for back-to-back mounting.
- P4: Denotes a high-precision tolerance class, ensuring extremely tight dimensional and running accuracy.
- TBT: Indicates the Triplex Back-to-Back arrangement of the three bearings in the set.
- M: Specifies that the bearing is lubricated from the manufacturer.
71821 CD/P4TBTM Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and maintains shaft positioning under complex loading conditions.
- Superior Load Capacity: The angular contact design with a 15° contact angle is optimized to support significant combined radial and axial loads simultaneously.
- Precision Performance: Manufactured to P4 tolerance standards, this bearing ensures minimal runout and vibration, which is critical for high-speed, high-accuracy applications.
- Optimized High-Speed Operation: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 16,000 rpm. The pre-applied lubrication ensures immediate and reliable operation.
- Preload & Matched Set: Supplied as a preloaded matched set of 3 bearings, ensuring optimal internal load distribution and eliminating the need for complex on-site adjustment, simplifying installation and enhancing performance consistency.
71821 CD/P4TBTM Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, rigidity, and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Industrial Pumps and Compressors: Applications requiring precise shaft control and high load capacity.
