7048 ACD/P4ADBC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7048 ACD/P4ADBC
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
Moderate / Class C
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/P4ADBC Bearing Product Overview & Core Advantages
The 7048 ACD/P4ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched pair is preloaded to Moderate / Class C standards, delivering superior rotational stability and stiffness. Its configuration enables it to handle combined loads—significant radial and axial loads in both directions—simultaneously. Manufactured to P4A tolerance class, it is ideal for high-precision, high-rigidity systems where minimal runout and precise shaft positioning are critical.
7048 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle for optimal axial load capacity. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards for superior running accuracy. |
| DB | Duplex Back-to-Back arrangement. This configuration provides high moment rigidity and excellent stability under complex loads. |
7048 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement and moderate preload create an exceptionally stiff bearing system that resists deflection under heavy combined loads and moment loads.
- Superior Load Capacity: With a dynamic load rating of 118,575 lbf and a static load rating of 209,250 lbf, this bearing is engineered for high-demand applications.
- Precision Performance: The P4A tolerance class ensures minimal vibration and precise shaft guidance, which is critical for maintaining accuracy in high-speed rotations.
- Optimized High-Speed Capability: The phenolic cage and 25° contact angle contribute to smooth operation and a high limiting speed of 7,500 rpm.
- Durable Construction: Components made from chrome steel offer high wear resistance and longevity, suitable for a wide operating temperature range.
7048 ACD/P4ADBC Bearing Typical Application Areas
This precision bearing is ideally suited for machinery and systems where high rigidity, accuracy, and reliability are non-negotiable. Key applications include:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high precision and stiffness.
- Precision Gearboxes: Especially in industrial robotics and high-torque transmission systems.
- High-Speed Compressors & Pumps: Where stable operation under combined loads is essential.
- Industrial Printing & Paper Converting Machinery: For rollers and cylinders demanding precise rotational control.
