7048 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7048 ACD/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
25 °
Ball & Washer Dimensions
Ball diameter
38.1 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
118575 lbf
Radial static load rating
209250 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
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In Stock
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7048 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7048 ACD/P4ADBB is a precision duplex pair of angular contact ball bearings designed for the most demanding applications. This matched set in a Back-to-Back (DB) arrangement delivers exceptional system rigidity and stability. Manufactured to the stringent P4A tolerance class, it is engineered to handle combined loads—significant radial and thrust loads in both directions—simultaneously. Its 25° contact angle and light preload (Class B) make it an ideal solution for high-precision, high-reliability spindles and machinery requiring superior running accuracy.
7048 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| ACD | Angular Contact, Duplex pair. Indicates a pre-matched set of two angular contact bearings. |
| P4A | The tolerance class, denoting very high precision levels for bore, outer diameter, and width, exceeding ABEC 7 standards. |
| DB | Back-to-Back arrangement. The two bearings are mounted with their back faces opposing each other, providing high moment rigidity. |
| Open | No integral seals or shields, allowing for optimal lubrication flow and cooling in controlled environments. |
7048 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- Superior Rigidity & Stability: The duplex Back-to-Back (DB) design creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring exceptional positional accuracy.
- High Load Capacity: The 25° contact angle and robust construction, featuring a phenolic cage and chrome steel components, enable high radial dynamic load rating of 118,575 lbf and a radial static load rating of 209,250 lbf for handling severe combined loads.
- Optimized High-Speed Performance: The lightweight and durable phenolic cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 7,500 rpm. The open design facilitates efficient lubrication management for heat dissipation.
- Precision Engineering: Adherence to the P4A tolerance class guarantees tight dimensional control and minimal runout, which is critical for applications requiring ultra-smooth operation and high rotational accuracy.
7048 ACD/P4ADBB Bearing Typical Application Areas
This precision duplex bearing is ideally suited for high-performance machinery where rigidity, speed, and accuracy are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Industrial gearboxes requiring high axial and radial stiffness.
- High-Frequency Motors & Spindles: Motors and spindles operating at elevated speeds.
- Industrial Pumps & Compressors: Applications demanding robust performance under significant combined loads.
