S71913 ACD/P4ATBTB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71913 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
0.63 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
65 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.004mm to 0
Width
39 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9518 lbf
Radial static load rating
10800 lbf
Limiting speed
31 X 1000 rpm
Lubrication
Grease
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
No drawings available at the moment, will be launched soon
In Stock
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S71913 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The S71913 ACD/P4ATBTB is a precision angular contact ball bearing configured in a Triplex Back-to-Back (TBT) matched set. This arrangement delivers exceptional high rigidity and stability, making it ideal for applications requiring superior rotational accuracy under combined loads (radial and axial). Manufactured to P4A tolerance class with a Light (Class B) preload, it is engineered for high-speed operation and long-term reliability in demanding precision machinery.
S71913 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
The model number S71913 ACD/P4ATBTB is decoded as follows:
- S7: High-grade bearing steel and design for high-speed operation.
- 1913: Standard size designation (Bore: 65mm, OD: 90mm, Width: 39mm).
- ACD: 25° contact angle, optimized for carrying high axial loads.
- P4A: High precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy.
- TBT: Triplex Back-to-Back matched set. Three bearings are supplied as a pre-matched unit for maximum system rigidity and moment load capacity.
- B: Designates the Light preload (Class B) within the matched set, reducing deflection and improving system stability.
S71913 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Triplex Back-to-Back (TBT) arrangement of three bearings creates an extremely stiff bearing system, capable of withstanding heavy combined loads and significant moment loads, ensuring precise shaft positioning.
- High-Speed Performance: The phenolic resin cage and 25° contact angle are optimized for high-speed operation, contributing to a high limiting speed. The P4A precision and light preload further minimize vibration and heat generation at high RPMs.
- Precision & Accuracy: Manufactured to a P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, this bearing guarantees exceptional running accuracy and minimal rotational runout.
- Sealed & Pre-Lubricated: The bearing is sealed and pre-lubricated with grease, offering protection from contaminants and providing reliable, maintenance-free operation within its specified temperature range.
S71913 ACD/P4ATBTB Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors requiring high shaft stability.
- Advanced Robotics and Automation axis drives.
