71919 ACD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71919 ACD/P4AQBCB
Basic Information
System of measurement
Metric
Weight
2.32 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
95 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
130 mm
Outside diameter tolerance
-0.004mm to 0
Width
72 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
27225 lbf
Radial static load rating
46800 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
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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71919 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71919 ACD/P4AQBCB is a super-precision angular contact ball bearing designed for the most demanding applications. Its Quadruplex Back-to-Back (QBC) matched arrangement provides exceptional system rigidity and stability, enabling it to handle complex combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it guarantees ultra-high running accuracy and is pre-lubricated for immediate use, making it an ideal choice for high-speed, high-precision machinery requiring maximum operational reliability.
71919 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71919 ACD/P4AQBCB is decoded as follows:
- 71919: Basic series designation for a high-precision angular contact ball bearing.
- ACD: 25° contact angle, a standard angle offering a balanced capacity for radial and axial loads.
- P4A: High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy tolerances.
- QBC: Quadruplex Back-to-Back matched set. Four bearings are specially selected and pre-matched to be mounted in a back-to-back configuration.
- B: Light Preload (Class B). The bearing set is supplied with a specific light preload to increase stiffness and minimize axial and radial runout.
71919 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The Quadruplex Back-to-Back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machining and positioning applications.
- High Load Capacity: With a dynamic load rating of 27,225 lbf and a static load rating of 46,800 lbf, this bearing is engineered to sustain significant combined radial and axial loads.
- Optimized for High-Speed Operation: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the limiting speed of 16,000 rpm. The 25° contact angle is well-suited for high-speed applications.
- Precision and Longevity: The P4A tolerance class ensures minimal vibration and high running accuracy. Components made from chrome steel provide excellent wear resistance and long service life under demanding conditions.
71919 ACD/P4AQBCB Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: For CNC milling centers, grinding spindles, and lathes.
- High-Frequency Motors and Spindles: Used in applications requiring very high rotational speeds.
- Precision Gearboxes and Robotic Drives: Where accurate motion control and high system stiffness are required.
- Aerospace and Defense Systems: In gyroscopes, radar equipment, and other critical precision mechanisms.
