7217 ACD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7217 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7217 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched set is preloaded to Light / Class B specifications, delivering superior running accuracy and stability. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads in both directions—simultaneously, making it ideal for high-precision, high-rigidity machinery. Manufactured to P4A tolerance class, it ensures minimal operational vibration and noise for demanding applications.
7217 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7217 | Basic bearing designation indicating a 85 mm bore, 150 mm OD, and 56 mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex (two bearings supplied as a matched set). |
| P4A | High precision tolerance class (equivalent to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DB | Back-to-Back arrangement, providing high moment rigidity and stability. |
| B | Light preload classification for reduced deflection and enhanced positional accuracy. |
7217 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The back-to-back (DB) duplex arrangement creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and providing exceptional system rigidity. The light preload eliminates internal clearance, minimizing axial and radial run-out under operational conditions.
Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 35,100 lbf, this bearing is engineered to handle demanding combined radial and axial loads simultaneously. The optimized internal geometry ensures efficient stress distribution.
Precision & High-Speed Performance: The P4A tolerance class guarantees precise bearing dimensions and smooth operation. The phenolic resin cage offers low weight and excellent high-speed characteristics, contributing to a limiting speed of 17,000 rpm. The open design allows for efficient lubrication management.
Durability & Reliability: Manufactured from high-grade chrome steel for both rings and balls, the bearing provides excellent wear resistance and long service life. The matched set is supplied lubricated and ready for installation.
7217 ACD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: For high-precision milling, grinding, and turning centers requiring extreme rigidity and accuracy.
- High-Frequency Motors & Spindles: Ideal for applications demanding high rotational speeds and minimal vibration.
- Precision Gearboxes & Transmission Systems: Where accurate shaft positioning and load capacity are critical.
- Industrial Pumps & Compressors: For handling axial and radial loads in demanding fluid-handling equipment.
- Robotics & Automation: In articulated arms and precision positioning systems.
