7013 CD/PA9ADBC
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7013 CD/PA9ADBC Bearing Product Overview & Core Advantages
The 7013 CD/PA9ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement enables the bearing to support combined loads—significant radial loads and bidirectional axial loads—simultaneously. Preloaded to a Moderate (Class C) level, it offers high running accuracy, excellent operational stability, and is optimized for high-speed performance, making it ideal for demanding, high-reliability machinery.
7013 CD/PA9ADBC Bearing Model Code Explained, Specifications & Naming Convention
- 7013: Basic bearing series, indicating a 65 mm bore, 100 mm outside diameter, and 36 mm width.
- C: Denotes a 15° contact angle, optimized for high-speed applications and moderate axial load capacity.
- D: Indicates the bearing is part of a duplex (matched) pair.
- /PA9A: Specifies the high-precision tolerance class PA9A, with extremely tight bore, outside diameter, and width tolerances for superior running accuracy.
- DB: Defines the specific Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
- C: Indicates the Moderate preload (Class C) applied to the matched set.
7013 CD/PA9ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and tilting moments. This structure allows the bearing to handle demanding combined radial and axial loads from both directions with high stability.
Precision & High-Speed Performance: Manufactured to the stringent PA9A tolerance class, this bearing ensures minimal runout and vibration. The 15° contact angle and phenolic resin cage contribute to lower friction and excellent performance at the specified limiting speed of 24,000 rpm.
Optimized Material & Preload: Constructed from chrome steel for both rings and balls, the bearing offers high durability and fatigue resistance. The factory-applied moderate preload (Class C) eliminates internal clearance, enhancing shaft positioning accuracy and system stiffness from startup.
7013 CD/PA9ADBC Bearing Typical Application Areas
This high-precision, high-rigidity bearing is engineered for advanced industrial applications, including:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Frequency Motor Spindles
- Precision Gearboxes and Pumps
- Industrial Robotics (e.g., arm and wrist joints)
- Aerospace Actuation Systems
