71909 CE/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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Materials
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71909 CE/P4ADBA Bearing Product Overview & Core Advantages
The 71909 CE/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Extra Light (Class A) specifications, ensuring high system stiffness and minimal runout. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside thrust loads in both directions—making it an ideal choice for high-precision, high-speed spindles and other critical machinery components where positional accuracy is paramount.
71909 CE/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series, indicating a high-precision angular contact design with a 45 mm bore, 68 mm OD, and 24 mm width. |
| CE | Specific internal design featuring a 15° contact angle and optimized internal geometry. |
| P4A | Indicates a super-precision tolerance class (exceeding ABEC 7), ensuring extremely tight dimensional and running accuracy for the highest performance applications. |
| DB | Specifies a Duplex Back-to-Back arrangement. Two bearings are factory-matched and mounted opposing each other to withstand moment loads and provide high rigidity. |
| A | Denotes the preload level, in this case, Extra Light (Class A), which minimizes friction and heat generation for very high-speed operation. |
71909 CE/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machine tool spindles.
Superior Precision: Manufactured to a P4A tolerance class, this bearing guarantees minimal runout and exceptional rotational accuracy, directly contributing to the finish quality and precision of machined parts.
Optimized High-Speed Performance: The combination of a lightweight phenolic resin cage, a 15° contact angle, and an Extra Light preload enables a high limiting speed of 41,000 rpm, reducing centrifugal forces and operational temperatures.
High Load Capacity: With a dynamic load rating of 3780 lbf and a static load rating of 3082 lbf, the bearing is engineered to handle the demanding combined loads encountered in precision applications.
Premium Materials: Constructed from chrome steel for both rings and balls, the bearing ensures high durability, wear resistance, and long service life under demanding conditions.
71909 CE/P4ADBA Bearing Typical Application Areas
The 71909 CE/P4ADBA is engineered for the most demanding high-precision and high-speed applications, including:
- Machine Tool Spindles: CNC milling centers, grinding spindles, and jig borers.
- Precision Rotary Systems: High-frequency motors, turbo-molecular pumps, and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and guidance systems.
- High-Speed Automation: Robotic arms, pick-and-place units, and precision indexing tables.
