71918 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
2.2 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
72 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
26325 lbf
Radial static load rating
43425 lbf
Limiting speed
15 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
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
Price available upon request.
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71918 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71918 ACD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring high rigidity and exceptional running accuracy. As part of a Quadruplex Back-to-Back (QBC) matched set, this bearing is engineered to handle combined radial and axial loads simultaneously. Its P4A tolerance class ensures ultra-precise dimensions and rotation, making it ideal for high-speed spindles and other precision machinery where maximum stiffness and minimal runout are critical.
71918 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71918 ACD/P4AQBCC provides detailed technical specifications:
- 71918: Basic bearing series, indicating a light-weight, high-precision angular contact design with a 90mm bore.
- A: Denotes a 25° contact angle, optimized for supporting high axial loads.
- C: Indicates a Moderate Preload (Class C), providing enhanced rigidity for the matched set.
- D: Specifies that the bearing is supplied Lubricated for immediate operation.
- /P4A: The tolerance class, signifying very high precision for both dimension and running accuracy.
- QBCC: Defines the matched arrangement as a Quadruplex Back-to-Back (QBC) set, consisting of 4 bearings.
71918 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads and moment loads. The 25° contact angle and moderate preload further enhance operational stiffness and positioning accuracy.
- Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal dimensional variation and superior running precision, which is essential for high-speed, high-accuracy applications.
- Optimized Components: The phenolic cage offers low weight and excellent performance at high speeds, contributing to the bearing's limiting speed of 15,000 rpm. The use of high-grade chrome steel for rings and balls ensures high durability and long service life.
- Ready for Installation: The bearing is supplied lubricated, simplifying the installation process and ensuring immediate, reliable operation.
71918 ACD/P4AQBCC 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: Applications requiring extreme accuracy and minimal deflection.
- High-Frequency Machining Centers
- Other precision rotary equipment where maximum system rigidity and running accuracy are paramount.
