7040 ACD/P4AQBCD
7000 Series Super Precision Angular Contact Ball Bearings
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7040 ACD/P4AQBCD Bearing Product Overview & Core Advantages
The 7040 ACD/P4AQBCD is a precision quadruplex matched set of angular contact ball bearings designed for the most demanding industrial applications. Engineered to a P4A tolerance class, this bearing arrangement delivers exceptional rotational accuracy and system rigidity. Its core advantage lies in the Quadruplex Back-to-Back (QBC) configuration, which provides an extremely high preload (Heavy / Class D) to ensure maximum stiffness and precise shaft positioning under significant combined loads, including heavy radial and thrust loads. This makes it an ideal solution for high-precision machinery requiring superior stability and minimal deflection.
7040 ACD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
The model number 7040 ACD/P4AQBCD provides detailed technical specifications:
- 7040: Basic bearing series, indicating a 200 mm bore, 310 mm OD, and 51 mm single width.
- A: Denotes a 25° contact angle, optimized for supporting high axial loads.
- CD: Indicates a duplex pair (two bearings mounted together).
- /P4A: Specifies the tolerance class, representing very high precision with tight dimensional and running accuracy tolerances.
- QBC: Defines the matched arrangement as Quadruplex Back-to-Back, meaning four bearings are supplied as a pre-matched set in a back-to-back configuration.
- D: Indicates the preload level is Heavy / Class D.
The bearing is Open (no integral seal) and comes Lubricated from the factory.
7040 ACD/P4AQBCD Bearing Structural Features & Performance Benefits
The performance of the 7040 ACD/P4AQBCD is a direct result of its advanced construction:
- Extreme Rigidity & High Preload: The Quadruplex Back-to-Back (QBC) arrangement with a Heavy preload creates an exceptionally stiff bearing system that resists operational deflection, crucial for maintaining precision under heavy combined loads.
- Superior Load Capacity: The 25° contact angle and robust construction using Chrome Steel for rings and balls enable high radial and axial load ratings (166,725 lbf dynamic; 328,500 lbf static).
- High-Speed Capability: The lightweight, high-strength Phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 16,250 rpm, suitable for demanding high-speed applications.
- Precision Operation: Manufactured to P4A super-precision standards with tight bore, OD, and width tolerances, this bearing ensures smooth, quiet, and vibration-free running.
7040 ACD/P4AQBCD Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically engineered for critical applications where accuracy and stability are paramount. Typical uses include:
- High-Precision Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Spindles for PCB drilling and routing
- Precision Gearboxes and transmission systems
- Industrial Turbines and compressors
- Advanced Robotics and automation equipment
