7218 ACD/P4AQBCB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7218 ACD/P4AQBCB
Basic Information
System of measurement
Metric
Weight
9.06 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
160 mm
Outside diameter tolerance
-0.004mm to 0
Width
120 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
73125 lbf
Radial static load rating
95625 lbf
Limiting speed
17 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
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7218 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 7218 ACD/P4AQBCB is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This matched set of four bearings is arranged in a back-to-back (QBC) configuration, enabling it to withstand combined radial and axial loads from both directions simultaneously. Manufactured to P4A tolerance class with a light preload (Class B), it delivers high running accuracy, excellent rotational stability, and is optimized for high-speed operation up to 17,000 rpm. Its compact design integrates the performance of four bearings into a single, highly rigid unit.
7218 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing series; 90 mm bore, 160 mm OD, 120 mm width. |
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High precision tolerance class (superior to ABEC-7), ensuring minimal runout and vibration. |
| QBC | Quadruplex Back-to-Back arrangement. A matched set of four bearings pre-configured for maximum moment stiffness. |
7218 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a dynamic load rating of 73,125 lbf and a static load rating of 95,625 lbf, this bearing set is engineered to handle significant radial and bidirectional axial loads simultaneously, thanks to the optimized 25° contact angle.
- High-Speed Capability: The use of a lightweight, durable phenolic cage and the precision P4A grading contribute to smooth operation and a high limiting speed of 17,000 rpm, reducing friction and heat generation.
- Pre-Configured for Performance: The set comes as a matched quadruplex with a light preload (Class B) applied, eliminating complex mounting procedures and ensuring immediate, optimal performance with reduced noise and vibration.
7218 ACD/P4AQBCB Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where extreme rigidity, precision, and speed are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in wind turbines and industrial power transmission systems.
- High-Frequency Machining Centers: Where minimal runout and high dynamic stability are required.
- Industrial Pumps and Compressors: For handling significant axial and radial forces in demanding conditions.
