71907 ACD/P4ATBTC

• 71907: Basic bearing series and size designation (35mm bore, 55mm OD, 30mm width).
• ACD: Angular Contact design with a 25° contact angle.
• P4A: Indicates an ultra-precision tolerance class exceeding ABEC 7/ISO P4, with enhanced running accuracy specifications.
• TBT: Denotes a Triplex Back-to-Back matched set arrangement, consisting of three bearings.
• C: Specifies a Moderate preload (Class C) applied to the matched set for optimal rigidity and performance.

High Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machining operations.

Superior Load Capacity: The 25° contact angle and robust construction enable the bearing to handle significant combined radial and axial loads simultaneously, with a dynamic load rating of 4478 lbf and a static load rating of 4185 lbf.

Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 56,000 rpm. The bearings are pre-lubricated for immediate operation.

Precision and Accuracy: Manufactured to P4A tolerance class with a bore and outside diameter tolerance of -0.004mm to 0, this bearing guarantees exceptional dimensional stability and run-out accuracy for the most demanding applications.

This precision bearing set is specifically designed for high-performance applications, including:

• Machine Tool Spindles: High-speed milling, grinding, and turning centers.
• Precision Spindles: PCB drilling, engraving, and other high-accuracy machining spindles.
• High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
• Robotics: High-precision joints and actuators requiring minimal deflection.