71948 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71948 CDGA/P4A Bearing Product Overview & Core Advantages
The 71948 CDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and rigidity. Manufactured to the stringent P4A tolerance class, this bearing excels in high-speed spindle applications. Its 15° contact angle and Universal Matchable (SU) design allow it to be precisely paired with a second bearing to form a preloaded duplex set, delivering exceptional stability and resistance to complex combined loads (radial and axial). The phenolic cage and optimized internal geometry contribute to its superior high-speed performance and smooth operation.
71948 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71948 | Basic bearing series and size designation (Bore: 240mm, OD: 320mm, Width: 38mm). |
| C | Specifies a 15° contact angle, optimized for high-speed operation. |
| DG | Indicates the bearing is Universal Matchable (SU). Two bearings can be universally paired in a Duplex arrangement (DB, DF, DT) to achieve a specific preload. |
| A | Denotes an Extra Light preload class. This light internal preload minimizes friction and heat generation while maximizing high-speed capability and running accuracy. |
| /P4A | Specifies the tolerance class. P4A represents very high precision levels for dimensional and running accuracy, exceeding standard ABEC 7/ISO P4 specifications. |
71948 CDGA/P4A Bearing Structural Features & Performance Benefits
- Super-Precision & High Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. When used in a preloaded duplex set, the system provides exceptional stiffness, crucial for minimizing deflection in machine tool spindles.
- Optimized Load Capacity: The angular contact design is engineered to support significant combined radial and axial loads simultaneously. The high dynamic load rating of 51,525 lbf ensures long service life under demanding conditions.
- Superior High-Speed Performance: The lightweight phenolic resin cage offers excellent strength-to-weight ratio and operates smoothly with minimal centrifugal force, enabling a high limiting speed. The 15° contact angle further reduces heat generation at high RPMs.
- Universal Matching Capability (SU): The Universal Matchable (SU) feature allows any two bearings to be paired without selective matching, simplifying inventory and assembly while ensuring consistent, high-performance preload in the final application.
71948 CDGA/P4A Bearing Typical Application Areas
The 71948 CDGA/P4A is the bearing of choice for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for high-RPM electric motors.
- Aerospace Equipment: Gyroscopes and other precision navigation instruments.
