71918 ACD/P4ATBTA
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
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71918 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71918 ACD/P4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set consists of three bearings arranged in a Triplex Back-to-Back (TBT) configuration, providing superior stability and the ability to handle significant combined loads (radial and axial). Manufactured to a P4A tolerance class and featuring an Extra light preload (Class A), it is engineered for high-speed operation and maximum system rigidity in precision machinery.
71918 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
- 71918: Basic model number denoting a high-precision angular contact bearing with a 90mm bore, 125mm OD, and 54mm width.
- ACD: Signifies Angular Contact design with a 25° contact angle.
- P4A: Indicates the tolerance class, specifying extremely tight dimensional and running accuracy.
- TB: Denotes a Triplex Back-to-Back matched set arrangement.
- T: Specifies the cage material, which is Phenolic, contributing to low weight and high-speed capability.
- A: Identifies the preload class as Extra Light.
71918 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Triplex Back-to-Back (TBT) arrangement of three bearings creates an exceptionally rigid bearing system, capable of supporting high radial dynamic load ratings (21510 lbf) and static load ratings (32175 lbf), as well as moment loads.
High-Speed Performance: The lightweight phenolic cage and optimized internal geometry enable a high limiting speed of 15,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity.
Precision Engineering: Manufactured to P4A tolerance class with tight bore, outer diameter, and width tolerances, ensuring precise shaft positioning and smooth, vibration-free operation.
Material Quality: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan.
71918 ACD/P4ATBTA Bearing Typical Application Areas
This bearing is ideal for high-precision, high-speed applications where maximum rigidity and accuracy are paramount. Typical uses include:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace Control Systems
