71918 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 CD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
1.65 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.004mm to 0
Width
54 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
22725 lbf
Radial static load rating
34425 lbf
Limiting speed
15 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
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71918 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71918 CD/P4ATBTA is a metric, ultra-precision angular contact ball bearing designed for the most demanding applications. This bearing is supplied as a triplex back-to-back (TBT) matched set with an extra light preload (Class A), delivering exceptional rotational accuracy and system rigidity. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads in both directions—simultaneously. Manufactured to a P4A tolerance class, it is engineered for high-speed operation, superior running accuracy, and long-term reliability in precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 54mm width). |
| CD | Specifies a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| P4A | Indicates an ultra-precision tolerance class with enhanced running accuracy and dimensional stability. |
| TB | Denotes the bearing arrangement as a Triplex Back-to-Back (TBT) matched set. |
| TA | Identifies the specific preload level as Extra Light (Class A). |
71918 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back arrangement creates an extremely rigid bearing system that can withstand high combined radial and axial loads from multiple directions, minimizing shaft deflection under operation.
- Precision & High-Speed Performance: The P4A tolerance class ensures minimal runout and vibration. Combined with the 15° contact angle and a lightweight, high-strength phenolic cage, the bearing achieves a high limiting speed of 15,000 rpm with smooth, stable operation.
- Optimized Internal Geometry: The bearing features 26 precision-ground chrome steel balls of 11.112 mm diameter, contributing to its high dynamic and static load ratings (22,725 lbf and 34,425 lbf respectively).
- Pre-lubricated & Ready for Installation: The bearing comes lubricated from the factory, simplifying installation and ensuring immediate, reliable performance within its specified temperature range.
71918 CD/P4ATBTA Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed machinery where maximum rigidity and accuracy are paramount. Key applications include:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-Frequency Spindles in PCB drilling and routing machines
- Precision Gearboxes and transmission systems
- Industrial Pumps and Compressors requiring high-speed shaft support
- Robotic Arm Joints and other automation equipment
