71905 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71905 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71905 ACD/P4ATBTB is a super-precision angular contact ball bearing designed for the most demanding applications. This metric bearing features a triplex back-to-back (TBT) matched arrangement, providing exceptional system rigidity and stability. Its core advantages include outstanding capability to handle combined loads (radial and axial), high operational accuracy due to its P4A tolerance class, and superior high-speed performance enabled by its phenolic cage and optimized internal geometry. This configuration is engineered for high reliability in precision machinery.
71905 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
- 71905: Basic series number (Light series, 25mm bore, 42mm OD).
- ACD: Angular Contact design with a 25° contact angle.
- P4A: Tolerance class denoting very high dimensional and running accuracy, superior to ABEC 7.
- TBT: Triplex Back-to-Back arrangement. This is a pre-loaded set of three bearings mounted back-to-back, offering maximum rigidity against moment loads.
- B: Denotes Light preload (Class B) applied to the matched set.
71905 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The triplex back-to-back (TBT) matched arrangement creates a highly rigid bearing system, effectively resisting complex moment and tilting loads, which is critical for maintaining precision in spindle applications.
Superior Load Capacity: With a 25° contact angle and three bearings in a set, this configuration provides excellent capacity for combined radial and axial loads.
High-Speed Performance: The lightweight phenolic cage ensures smooth operation and low centrifugal forces, contributing to a high limiting speed of 53,000 rpm. The open design allows for efficient lubrication management.
Precision Operation: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, this bearing ensures minimal runout and vibration for ultra-precise applications.
71905 ACD/P4ATBTB Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors
- Other precision machinery requiring extreme rigidity and rotational accuracy.
