S71909 ACB/P4ADT
Sealed Super Precision Angular Contact Ball Bearings
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S71909 ACB/P4ADT Bearing Product Overview & Core Advantages
The S71909 ACB/P4ADT is a precision duplex tandem angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing is preloaded and supplied as a matched set of two bearings, enabling it to handle combined radial and axial loads simultaneously. Its compact design, featuring a 45 mm bore and 68 mm outside diameter, makes it ideal for high-speed spindles and other precision machinery where space is constrained and operational reliability is paramount.
S71909 ACB/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1909 | Bore diameter: 45 mm, Outside diameter: 68 mm, Width: 24 mm. |
| ACB | Contact angle of 25°, a standard for angular contact bearings. |
| P4A | High precision tolerance class with enhanced running accuracy. |
| DT | Duplex Tandem arrangement. Two bearings are matched and preloaded to share the axial load in the same direction, increasing axial rigidity and load capacity. |
S71909 ACB/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem (DT) arrangement of two preloaded bearings creates a highly rigid system capable of supporting significant combined loads. This setup is optimized for applications with high unidirectional axial loads.
- Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and superior rotational accuracy, which is critical for high-speed and high-precision applications.
- Optimized High-Speed Operation: The lightweight phenolic resin cage minimizes centrifugal forces, contributing to stable operation at the high limiting speed of 41,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity for high-speed use.
- Sealed & Pre-Lubricated: As a sealed bearing, it is filled with grease, protecting against contamination and providing long-term, maintenance-free operation within its specified temperature range.
S71909 ACB/P4ADT Bearing Typical Application Areas
The S71909 ACB/P4ADT is engineered for demanding applications where precision and speed are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors and encoders.
- Medical Equipment: Dental handpieces and small precision drives.
