7048 CD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7048 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
34.2 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
240 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
360 mm
Outside diameter tolerance
-0.004mm to 0
Width
112 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
38.1 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
125775 lbf
Radial static load rating
220500 lbf
Limiting speed
7.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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.
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7048 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7048 CD/P4ADBB is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back arrangement is preloaded to Light / Class B specifications, ensuring high system stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with superior performance, making it ideal for high-precision, high-rigidity machinery. The bearing is supplied lubricated and ready for installation, contributing to operational reliability.
7048 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7048 CD/P4ADBB is decoded as follows:
- 7048: Basic bearing designation indicating a 240 mm bore and 360 mm outside diameter.
- C: Denotes a 15° contact angle, optimized for handling axial loads.
- D: Indicates the bearing is part of a duplex pair.
- P4A: Specifies a high-precision tolerance class superior to ABEC 7, ensuring extremely tight dimensional and running accuracy.
- DB: Signifies the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
- B: Indicates a Light preload is applied to the matched set.
7048 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement of two bearings creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring stable operation under heavy combined loads.
- Superior Precision: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring high positional accuracy.
- Optimized Load Capacity: The 15° contact angle and robust construction, including a phenolic cage and chrome steel components, provide a high dynamic and static load rating (125,775 lbf / 220,500 lbf), enabling reliable performance under significant stress.
- High-Speed Capability: The combination of the lightweight phenolic cage, precision grinding, and optimized internal geometry allows for a high limiting speed of 7,500 rpm, making it suitable for high-speed spindles.
7048 CD/P4ADBB Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors requiring high shaft stability.
- Robotic Arm Joints and Rotary Tables in automation systems.
- Aerospace & Defense positioning systems and radar equipment.
