S71918 ACE/P4ADT
Sealed Super Precision Angular Contact Ball Bearings
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Main Dimensions
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S71918 ACE/P4ADT Bearing Product Overview & Core Advantages
The S71918 ACE/P4ADT is a super-precision angular contact ball bearing designed for the most demanding applications. This duplex tandem (DT) matched set delivers exceptional high rigidity and axial load capacity in a compact design. Manufactured to ABEC 7 / P4A tolerance class, it ensures superior running accuracy and is preloaded for immediate, precise operation. The combination of a phenolic cage and grease lubrication enables high-speed performance, making it an ideal solution for machine tool spindles and other high-precision, high-reliability machinery.
S71918 ACE/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| S | Super-precision bearing | Guarantees extremely tight dimensional and running accuracy. |
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 36mm width). | Defines the core bearing dimensions and internal geometry. |
| ACE | 25° contact angle and optimized internal design. | Enhances axial load carrying capacity and high-speed characteristics. |
| P4A | Tolerance class equivalent to ABEC 7 with specific running accuracy requirements. | Ensures minimal runout and vibration for superior performance. |
| DT | Duplex Tandem arrangement of two bearings. | Maximizes axial load capacity and system rigidity in one direction. |
S71918 ACE/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem matched set creates an exceptionally stiff bearing system, capable of handling heavy combined loads (radial and substantial unidirectional axial loads). This configuration is essential for applications requiring minimal shaft deflection.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the 25° contact angle provides an optimal balance for high rotational speeds, achieving a limiting speed of 15,000 rpm.
Precision & Reliability: Manufactured to P4A tolerance class with a bore and outer diameter tolerance of -0.004mm to 0, this bearing guarantees precise fitment and smooth, accurate operation. The standard grease lubrication is suitable for the specified operating temperature range.
S71918 ACE/P4ADT Bearing Typical Application Areas
The S71918 ACE/P4ADT is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and precision grinding equipment.
- High-Frequency Motors: Spindles for applications requiring high rotational accuracy.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
