7038 ACD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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7038 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7038 ACD/P4ADBA is a metric system, P4A tolerance class duplex angular contact ball bearing designed for ultimate precision and performance. Its core advantage lies in its matched back-to-back (DB) arrangement and Extra light (Class A) preload, which provides exceptional system rigidity and running accuracy. This configuration is engineered to handle combined loads—significant radial and axial loads from both directions—simultaneously, making it ideal for high-precision, high-stability applications where minimal deflection is critical. The use of a phenolic cage contributes to its suitability for high-speed operation.
7038 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 7038 | Basic bearing designation indicating a 190 mm bore, 290 mm OD, and 92 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates the bearing is part of a Duplex (matched pair) set. |
| P4A | Denotes a high-precision tolerance class, exceeding standard P4 levels, ensuring extremely tight dimensional and running accuracy. |
| DB | Specifies the Back-to-Back mounting arrangement of the duplex set. |
| A | Signifies an Extra light preload on the matched set, optimizing it for high-speed, low-friction operation. |
7038 ACD/P4ADBA Bearing Structural Features & Performance Benefits
The performance of the 7038 ACD/P4ADBA is a direct result of its sophisticated design. The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft misalignment, delivering high rigidity. This, combined with the 25° contact angle and high dynamic load rating, provides superior capability for handling combined radial and axial loads. The phenolic cage is lightweight and robust, enabling smooth operation at the high limiting speed of 11,000 rpm with reduced centrifugal forces. The P4A precision and extra light preload ensure minimal runout and vibration, which is critical for maintaining positional accuracy. The bearings are supplied lubricated and ready for installation.
7038 ACD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is specifically engineered for demanding applications where rotational accuracy, rigidity, and speed are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motorized Spindles.
- Industrial Pumps and Compressors requiring stable, long-lasting performance.
- Aerospace & Defense positioning systems and navigation instruments.
- Medical Equipment such as high-speed dental handpieces and imaging devices.
