71912 CD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71912 CD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.57 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 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
7.938 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9518 lbf
Radial static load rating
10462 lbf
Limiting speed
31 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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71912 CD/P4ATBTC Bearing Product Overview & Core Advantages
The 71912 CD/P4ATBTC is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and rotational accuracy. This triplex matched set in a back-to-back (TBT) arrangement provides superior stability and can accommodate combined radial and axial loads. Manufactured to P4A tolerance class, it offers high running accuracy and is pre-lubricated for immediate use, making it ideal for high-speed, high-precision machinery requiring reliable performance.
71912 CD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71912 CD/P4ATBTC is decoded as follows:
- 71912: Basic bearing designation indicating a light series, angular contact bearing with a 60 mm bore.
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Indicates the bearing has an enhanced internal design for higher precision and performance.
- P4A: Specifies the tolerance class, signifying very high dimensional and running accuracy.
- TBT: Stands for Triplex Back-to-Back, indicating a set of three bearings matched for a specific preload and arranged back-to-back to withstand moment loads and provide high system rigidity.
- C (in TBT): Refers to the Moderate preload / Class C.
71912 CD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a dynamic load rating of 9518 lbf and a static load rating of 10462 lbf, this bearing set is engineered to handle significant radial and axial forces simultaneously.
- High-Speed Performance: The 15° contact angle and lightweight, durable phenolic resin cage contribute to stable operation at high rotational speeds, with a limiting speed of 31,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances, this bearing ensures minimal runout and vibration for smooth, accurate rotation.
- Pre-lubricated & Ready-to-Use: The bearing comes lubricated from the factory, simplifying installation and providing immediate protection.
71912 CD/P4ATBTC Bearing Typical Application Areas
This high-precision triplex bearing set is ideally suited for:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace Actuators and Control Systems
- Medical and Dental Equipment Spindles
