7009 CDGA/P4A
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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7009 CDGA/P4A Bearing Product Overview & Core Advantages
The 7009 CDGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. Positioned in the P4A tolerance class, it offers extremely tight dimensional and running accuracy. Its 15° contact angle and extra light preload (Class A) make it ideally suited for high-speed operation while providing excellent rigidity. As a Universal Matchable (SU) bearing, it can be supplied in sets of three for simplified mounting in preloaded arrangements, delivering superior rotational precision and stability.
7009 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 7009: Basic designation indicating a 45 mm bore and 75 mm outside diameter.
- CD: Stands for a 15° contact angle and signifies the bearing is part of a Universal Matchable (SU) pair/group.
- GA: Indicates the preload level is Extra Light (Class A).
- P4A: Denotes a super-precision tolerance class with enhanced running accuracy and dimensional tolerances beyond ABEC 7.
7009 CDGA/P4A Bearing Structural Features & Performance Benefits
The bearing's performance is derived from its meticulous construction. The phenolic resin cage ensures low weight and excellent performance at high rotational speeds (with a limiting speed of 46,000 rpm), reducing centrifugal forces and friction. The open seal type allows for optimal lubrication flow, which is crucial for heat dissipation in high-speed applications. Manufactured to P4A precision standards, it guarantees minimal runout and vibration, contributing to the high rigidity and smooth operation required in precision machinery. The use of chrome steel for both rings and balls ensures high durability and fatigue life under the specified dynamic (6435 lbf) and static (5040 lbf) load ratings.
7009 CDGA/P4A Bearing Typical Application Areas
This bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Where utmost accuracy and minimal runout are critical.
- High-Frequency Motors: Supporting high rotational speeds with stability.
- Medical Equipment: Such as high-speed dental handpieces and laboratory centrifuges.
- Aerospace Instrumentation: In gyroscopes and other navigation systems.
