S7008 ACD/P4AQBTC
Sealed Super Precision Angular Contact Ball Bearings
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S7008 ACD/P4AQBTC Bearing Product Overview & Core Advantages
The S7008 ACD/P4AQBTC is a metric precision angular contact ball bearing configured as a Quadruplex Tandem Back-to-Back (QBT) matched set. This specialized arrangement is engineered to deliver exceptional axial rigidity and handle very high combined loads. With a P4A super-precision tolerance and moderate preload (Class C), it is designed for applications demanding the highest levels of rotational accuracy, stability, and reliability in high-performance machinery.
S7008 ACD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| ACD | 25° Contact Angle, providing optimized performance for combined radial and axial loads. |
| P4A | Super-precision tolerance class, exceeding standard ABEC 7/ISO P4, for ultra-high running accuracy. |
| QBT | Indicates a Quadruplex (4-bearing) Tandem Back-to-Back matched arrangement. |
| C | Specifies a Moderate Preload for enhanced stiffness without excessive heat generation. |
S7008 ACD/P4AQBTC Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and significant moment loads. This setup provides maximum axial and radial stiffness, which is critical for maintaining precision under load.
High-Speed Capability: The use of a lightweight, durable phenolic cage reduces centrifugal forces, contributing to the bearing's high limiting speed of 41,000 rpm. The 25° contact angle offers an excellent balance for high-speed operation.
Precision and Longevity: Manufactured to P4A tolerance and preloaded at the factory, this set ensures consistent, precise performance with minimal runout. The chrome steel rings and balls provide high fatigue life and reliability. The set is pre-lubricated with grease suitable for a wide operating temperature range.
S7008 ACD/P4AQBTC Bearing Typical Application Areas
This high-precision bearing set is ideally suited for the most demanding applications where extreme rigidity and accuracy are paramount:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision High-Frequency Spindles
- Advanced Robotic Drives and Actuators
- Axial compressors and pumps requiring high axial stiffness
- Other precision rotary equipment where a pre-matched, pre-loaded bearing set is specified for optimal performance.
