71907 CD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 CD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.22 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
55 mm
Outside diameter tolerance
-0.004mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4680 lbf
Radial static load rating
4410 lbf
Limiting speed
56 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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71907 CD/P4ATBTC Bearing Product Overview & Core Advantages
The 71907 CD/P4ATBTC is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. This bearing features a triplex back-to-back (TBT) matched arrangement, providing superior stability and the ability to handle significant combined loads (radial and axial). With a P4A tolerance class and moderate preload (Class C), it delivers outstanding running accuracy and is optimized for high-speed operation up to 56,000 rpm. Its compact design, with a 35 mm bore and 55 mm outside diameter, makes it ideal for space-constrained, high-reliability machinery.
71907 CD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71907 CD/P4ATBTC is decoded as follows:
- 71907: Basic bearing series, indicating a light series angular contact bearing with a 35 mm bore diameter.
- C: Represents a 15° contact angle, optimized for high-speed applications and moderate axial loads.
- D: Indicates the bearing is supplied with a moderate preload (Class C) for enhanced rigidity and precise shaft positioning.
- P4A: Denotes an ultra-precision tolerance class superior to ABEC 7, ensuring extremely tight dimensional and running accuracy.
- TBT: Specifies the Triplex Back-to-Back matched arrangement. Three bearings are precision-matched and supplied as a set to work in unison.
- C: The final 'C' confirms the 15° contact angle for the entire matched set.
71907 CD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back (TBT) arrangement creates a wide, stable support system that significantly increases moment rigidity and minimizes shaft deflection under complex loads.
- Superior Load Capacity: Engineered to withstand substantial combined radial and axial loads. The 15° contact angle effectively manages thrust loads in both directions while maintaining high-speed capability.
- Precision High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower friction and higher limiting speeds. The P4A tolerance ensures smooth, vibration-free operation essential for high-speed spindles.
- Optimized for Precision Applications: Manufactured from chrome steel for both rings and balls, the bearing offers high durability and wear resistance. The supplied preload eliminates internal clearance, ensuring immediate precision upon installation.
71907 CD/P4ATBTC Bearing Typical Application Areas
The 71907 CD/P4ATBTC is ideally suited for high-precision, high-speed machinery where rigidity and accuracy are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and routing.
- Industrial Pumps and Compressors: Applications requiring precise shaft control and high-speed operation.
