7018 CD/P4AQBCB
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7018 CD/P4AQBCB Bearing Product Overview & Core Advantages
The 7018 CD/P4AQBCB is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing is configured in a Back-to-Back (QBC) matched arrangement, providing superior stability and the ability to withstand combined loads (radial and axial loads from both directions simultaneously). Its light preload (Class B) ensures precise rotational accuracy and minimal run-out, making it ideal for high-precision, high-rigidity spindles and other critical machinery.
7018 CD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7018 | Basic Bearing Series & Size | Standard metric series with 90mm bore, 140mm OD. |
| CD | 15° Contact Angle & High Precision | Optimized for high-speed operation and axial load capacity. |
| P4A | Tolerance Class | Denotes ultra-precision dimensional and running accuracy, superior to ABEC 7. |
| QBC | Matched Arrangement (Quadruplex Back-to-Back) | Four bearings are selectively matched and preloaded in a back-to-back configuration to achieve maximum system rigidity and moment load capacity. |
7018 CD/P4AQBCB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of supporting heavy combined loads and significant moment loads. This configuration provides excellent operational stability under complex loading conditions.
Precision & High-Speed Performance: Manufactured to P4A tolerance class with a 15° contact angle, this bearing ensures minimal vibration and precise running accuracy. The phenolic cage offers low weight and excellent high-speed performance, contributing to a limiting speed of 15,000 rpm.
Optimized Component Design: The use of chrome steel for rings and balls ensures high durability and fatigue life. With 20 balls of 15.875 mm diameter, the bearing achieves a high dynamic load rating of 46,800 lbf and a static load rating of 68,625 lbf.
Pre-lubricated & Ready-to-Install: The bearing is supplied lubricated and is an open type, allowing for integration into centralized lubrication systems or for the application of specific high-performance greases as required by the application.
7018 CD/P4AQBCB Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is engineered for the most demanding applications, including:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- Precision Gearboxes and Transmission Systems
- Industrial Pumps and Compressors requiring high shaft stability
- Aerospace and Defense Actuation Systems
- High-Frequency Motors and Spindles
