71913 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71913 ACD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.63 kg
Tolerance class
P4A
Seal type
Open
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
36 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
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In Stock
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71913 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71913 ACD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This bearing is supplied as a triplex back-to-back (TBT) matched set, preloaded to Moderate / Class C for immediate operational stability. Its primary advantage lies in its ability to handle combined loads—significant radial and thrust loads simultaneously—making it ideal for high-precision, high-rigidity systems. Manufactured to P4A tolerance class, it guarantees superior running accuracy and performance consistency.
71913 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71913 ACD/P4ATBTC is decoded as follows:
- 71913: Basic series designation for a high-precision angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a duplex (two-bearing) pairing. In this context, it forms part of a larger matched set.
- P4A: Denotes a super-precision tolerance class, exceeding standard ABEC 7/ISO Class 4, ensuring minimal runout and vibration.
- TB: Indicates a Triplex Back-to-Back matched arrangement of three bearings.
- T: Specifies the cage material as Phenolic, which is lightweight and suitable for high-speed operation.
- BC: Indicates the specific preload level, in this case, Moderate / Class C.
71913 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back (TBT) arrangement creates an extremely rigid bearing system, capable of withstanding heavy combined loads and moments. The 25° contact angle is optimized for supporting substantial thrust loads in addition to radial loads.
- High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, enabling a high limiting speed of 36,000 rpm. The bearing is pre-lubricated for immediate high-speed operation.
- Super-Precision: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures exceptional running accuracy, low noise, and minimal vibration for critical spindles.
- Material Integrity: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and a long operational life under demanding conditions.
71913 ACD/P4ATBTC Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and other high-frequency motor spindles.
- Robotics: High-accuracy joints and actuators.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
