7217 ACDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7217 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7217 ACDGB/P4A is a single-row angular contact ball bearing designed for high-precision and high-speed applications. Engineered to a P4A tolerance class, it delivers exceptional rotational accuracy and dimensional stability. Its key advantage lies in its ability to support combined loads (simultaneous radial and axial loads) efficiently, making it ideal for applications requiring high rigidity and precise shaft positioning. The bearing is universally matchable (SU designation), allowing for flexible mounting in preloaded sets to achieve optimal system stiffness.
7217 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7217 | Basic bearing series and size designation (85mm bore, 150mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| DGB | Duplex arrangement, Back-to-Back mounting. This configuration provides high moment rigidity. |
| P4A | Indicates a super-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for enhanced running accuracy. |
7217 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and back-to-back (DGB) duplex arrangement enable the bearing to handle significant combined radial and axial loads, providing excellent system stability and resistance to moment loads.
- High-Speed Performance: The lightweight phenolic resin cage ensures smooth operation at high rotational speeds, contributing to the bearing's limiting speed of 17,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, guaranteeing superior running accuracy and minimal vibration.
- Material & Construction: Components made from high-grade chrome steel offer high fatigue life and durability. The open design allows for customized lubrication schemes to suit specific application needs.
7217 ACDGB/P4A Bearing Typical Application Areas
The 7217 ACDGB/P4A is ideally suited for demanding applications in:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace Control Systems
- Medical and Dental Equipment
