S71908 ACB/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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Materials
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S71908 ACB/HCP4ADT Bearing Product Overview & Core Advantages
The S71908 ACB/HCP4ADT is a high-precision duplex tandem angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched set bearing features a 25° contact angle and is preloaded for optimal performance, enabling it to handle significant combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it delivers superior running accuracy. The use of ceramic balls and a phenolic cage contributes to its capabilities as a high-speed bearing with a low thermal expansion coefficient and extended service life.
Model Code Breakdown
- S71908: Basic designation for a 40mm bore, 62mm OD, 24mm width angular contact ball bearing.
- ACB: Angular Contact Bearing with a 25° contact angle.
- HCP4A: Indicates the high-precision P4A tolerance class.
- DT: Duplex Tandem arrangement. Two bearings are mounted together to increase axial load capacity in one direction.
S71908 ACB/HCP4ADT Bearing Structural Features & Performance Benefits
Enhanced Rigidity and Load Capacity: The duplex tandem (DT) arrangement of two preloaded bearings creates an exceptionally rigid system, significantly increasing the axial load capacity compared to a single bearing. This makes it ideal for applications requiring resistance to complex combined loads.
Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a high limiting speed of 41,000 rpm, minimizing friction and heat generation.
Precision and Stability: Manufactured to P4A tolerance class with a 25° contact angle, this bearing ensures high running accuracy, minimal vibration, and precise shaft positioning, which is critical in precision machinery.
Sealed and Lubricated for Life: As a sealed bearing pre-lubricated with grease, it is protected from contamination and is ready for installation, offering a maintenance-free solution within its specified temperature range.
S71908 ACB/HCP4ADT Bearing Typical Application Areas
The S71908 ACB/HCP4ADT is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Spindles: In PCB drilling machines and other high-speed automated equipment.
- High-Frequency Motors and Turbochargers.
- Medical Equipment: Such as dental handpieces and laboratory centrifuges.
