7038 ACD/P4AQBCC
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7038 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 7038 ACD/P4AQBCC is a precision quadruplex matched bearing set designed for demanding applications requiring exceptional rigidity and accuracy. This metric angular contact ball bearing features a back-to-back quadruplex (QBC) arrangement, providing superior stability and the ability to handle significant combined loads (radial and axial). With a P4A tolerance class and moderate preload (Class C), it delivers high rotational accuracy and is ideally suited for high-precision, high-rigidity systems such as machine tool spindles.
7038 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7038 | Standard bearing series number, defining the basic dimensions: 190mm bore, 290mm OD, 184mm width. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| QBCC | Specifies a Quadruplex Back-to-Back (QBC) matched set with Moderate Preload (Class C). |
7038 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system, effectively resisting complex moment loads and providing exceptional operational stability. This configuration significantly enhances the bearing's load rating, with a dynamic load capacity of 139,050 lbf and a static load capacity of 261,000 lbf.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, ensuring minimal runout and high positional accuracy. The 25° contact angle is optimized for supporting substantial axial loads in combination with radial loads.
High-Speed Capability: The phenolic cage offers low weight and excellent performance at high speeds, contributing to a limiting speed of 11,000 rpm. The bearing is pre-lubricated for immediate operation.
Durable Construction: Both rings and balls are made from high-grade chrome steel, providing excellent wear resistance and long service life under demanding conditions.
7038 ACD/P4AQBCC Bearing Typical Application Areas
The 7038 ACD/P4AQBCC is engineered for high-performance machinery where precision, rigidity, and reliability are paramount. Key applications include:
- High-Precision Machine Tool Spindles
- Industrial Grinding Machines
- High-Rigidity CNC Machining Centers
- Precision Gearboxes
- Specialized Medical and Aerospace Equipment
