71918 CD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 CD/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
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
28125 lbf
Radial static load rating
45900 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
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In Stock
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71918 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 71918 CD/P4AQBCC is a precision quadruplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This metric system bearing features a back-to-back quadruplex (QBC) matched arrangement, enabling it to withstand combined radial and axial loads from multiple directions simultaneously. Manufactured to a P4A tolerance class, it delivers superior running accuracy and rotational precision, making it ideal for high-performance machinery where high rigidity and moderate preload (Class C) are critical for operational stability.
71918 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing designation, indicating a high-precision angular contact ball bearing series with a 90 mm bore, 125 mm OD, and 72 mm width. |
| CD | Contact angle designation of 15°, optimized for handling combined loads. |
| P4A | High-precision tolerance class, exceeding standard ABEC-7/ISO P4 specifications for enhanced running accuracy. |
| QBCC | Indicates a Quadruplex Back-to-Back (QBC) matched set with moderate preload (Class C), providing high system rigidity and precise shaft positioning. |
71918 CD/P4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of supporting high radial dynamic loads (28,125 lbf) and static loads (45,900 lbf), as well as significant axial loads in both directions. This configuration minimizes deflection under heavy combined loads.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for precise rotational applications.
- Optimized Component Design: Features a phenolic cage for reduced weight and smooth operation at the limiting speed of 15,000 rpm. The chrome steel rings and balls provide excellent durability and wear resistance.
- Pre-lubricated & Ready for Installation: Comes pre-lubricated for immediate use, with an operational temperature range of -30°C to 110°C.
71918 CD/P4AQBCC Bearing Typical Application Areas
- High-Precision Machine Tool Spindles requiring extreme rigidity and accuracy
- Industrial Pumps and Compressors handling significant radial and axial loads
- Precision Grinding Spindles and other high-speed machining applications
- Aerospace Positioning Systems demanding precise rotational control
- Robotic Arm Joints and other automation equipment requiring high load capacity
