S71920 ACB/P4ADGA
Sealed Super Precision Angular Contact Ball Bearings
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S71920 ACB/P4ADGA Bearing Product Overview & Core Advantages
The S71920 ACB/P4ADGA is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a universal matchable (SU) bearing supplied in a set of two, it is engineered to accommodate combined loads—significant radial and bidirectional axial loads simultaneously. Manufactured to the exacting P4A tolerance class, it delivers exceptional running accuracy, low noise, and low vibration, making it ideal for high-reliability spindles and precision machinery. Its sealed design and pre-lubrication ensure long-term, maintenance-free operation.
S71920 ACB/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71920 | Basic bearing designation, indicating a 100mm bore, 140mm OD, 40mm width angular contact ball bearing. |
| ACB | Contact angle of 25° and an Extra Light (A) preload. This optimizes the bearing for high-speed operation while providing precise shaft positioning. |
| P4A | The tolerance class, denoting superior dimensional and running accuracy exceeding ABEC 7/ISO P4 standards, crucial for precision applications. |
| DGA | Indicates the bearing is sealed and grease-lubricated from the factory, protecting against contamination and providing ready-to-install, maintenance-free performance. |
S71920 ACB/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double-row design and 25° contact angle provide superior radial and axial stiffness, enabling stable support under combined loads. With a dynamic load rating of 7470 lbf, it ensures long service life in demanding conditions.
- Super-Precision & High-Speed Performance: Manufactured to P4A tolerances with a phenolic resin cage, this bearing achieves excellent rotational accuracy and is optimized for high-speed operation up to 10,000 rpm, minimizing friction and heat generation.
- Universal Matchability (SU): Supplied as a universally matchable pair, these bearings can be mounted in tandem, back-to-back, or face-to-face arrangements with a pre-determined axial clearance, offering exceptional flexibility in spindle design.
- Maintenance-Free Operation: The integral seals effectively retain the high-performance grease lubricant and exclude contaminants, ensuring reliable performance throughout the bearing's service life without re-lubrication.
S71920 ACB/P4ADGA Bearing Typical Application Areas
The S71920 ACB/P4ADGA is the bearing of choice for high-performance machinery requiring extreme precision and speed. 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 electric motors and generators.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
