S71908 ACD/P4ADT
Sealed Super Precision Angular Contact Ball Bearings
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S71908 ACD/P4ADT Bearing Product Overview & Core Advantages
The S71908 ACD/P4ADT is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This duplex tandem (DT) arrangement consists of two preloaded bearings, delivering superior high rigidity and the ability to handle significant combined loads. Manufactured to a P4A tolerance class, it is engineered for high-speed performance and stable operation in precision machinery. Its compact design and sealed construction make it an ideal choice for high-reliability spindles and systems.
S71908 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision bearing series with specific internal geometry for optimal performance.
- 1908: Standard size designation (Bore: 40mm, OD: 62mm, Width: 24mm).
- ACD: Angular Contact design with a 25° contact angle and a Duplex Tandem (DT) preloaded arrangement.
- P4A: Super-precision tolerance class (exceeding ABEC 7), ensuring extremely tight dimensional and running accuracy.
- DT: Confirms the Duplex Tandem matched set, consisting of 2 bearings.
S71908 ACD/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle provide exceptional axial and radial stiffness, enabling the bearing to withstand heavy combined loads with minimal deflection.
Super-Precision & High-Speed Operation: Manufactured to P4A tolerance class and featuring a lightweight phenolic resin cage, this bearing achieves smooth rotation and a high limiting speed of 41,000 rpm, making it suitable for very high-speed spindles.
Optimized Internal Design: The bearing utilizes 21 high-grade chrome steel balls of 6.35mm diameter, precisely configured to maximize load distribution and dynamic performance.
Sealed & Pre-Lubricated: The sealed design with pre-applied grease lubrication protects against contamination and provides long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S71908 ACD/P4ADT Bearing Typical Application Areas
This super-precision bearing is ideally suited for applications where extreme accuracy, high speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: High-frequency spindles for PCB drilling and precision engraving.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
