71813 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71813 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71813 ACD/P4DGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-lubricated, light preload (Class B) set of two, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial forces. Its P4 tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other high-performance machinery where reliability and minimal runout are critical.
71813 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
- 71813: Basic bearing series, indicating a lightweight, high-precision design with a 65 mm bore, 85 mm OD, and 20 mm width.
- ACD: Angular Contact, 25° contact angle, and Universal Matchable (DU) configuration. This signifies the bearing is designed to be mounted in a duplex pair (back-to-back, face-to-face, or tandem) to handle bidirectional axial loads and provide high system rigidity.
- P4: Denotes a super-precision tolerance class, exceeding ABEC-7 standards, for applications requiring extreme running accuracy and high-speed capability.
- DGB: Indicates the bearing is supplied as a Universal Matchable (SU) set of two bearings with a Light Preload (Class B) applied. This "ready-to-install" pairing simplifies mounting and ensures optimal performance from the outset.
71813 ACD/P4DGB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The 25° contact angle and universal matchable design allow for the creation of a stiff bearing system that effectively supports combined radial and axial loads from both directions. The light preload eliminates internal clearance, enhancing shaft positioning accuracy and system stiffness.
High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at the high limiting speed of 36,000 rpm. The P4 precision grade further ensures smooth, low-vibration running at high velocities.
Precision and Durability: Manufactured from chrome steel for both rings and balls, the bearing offers high hardness and wear resistance. The open seal type allows for optimal lubrication management in controlled environments, maximizing the bearing's dynamic load rating of 4680 lbf and service life.
71813 ACD/P4DGB Bearing Typical Application Areas
This bearing is specified for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high positional accuracy.
- High-Frequency Motors and Spindles: Found in PCB drilling, dental handpieces, and small precision drives.
- Medical and Laboratory Equipment: Centrifuges and precision rotary stages.
