71930 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71930 ACD/P4ADBC
Basic Information
System of measurement
Metric
Weight
5 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
150 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
56 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
40050 lbf
Radial static load rating
56250 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71930 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 71930 ACD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and the ability to withstand combined loads, including significant radial and bidirectional axial loads. Manufactured to P4A tolerance class and featuring a moderate preload (Class C), it is engineered for high-performance scenarios in machine tools and precision equipment where high rigidity and operational reliability are paramount.
71930 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71930 ACD/P4ADBC is decoded as follows:
- 71930: Basic series designation for a high-precision angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two-bearing) set.
- P4A: Denotes a very high precision tolerance class, exceeding ABEC 7 standards.
- DB: Specifies the Duplex Back-to-Back mounting arrangement.
- C: Indicates a Moderate Preload (Class C) applied to the bearing set.
71930 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid, moment-resisting system, significantly enhancing the bearing's ability to handle combined radial and axial loads. The 25° contact angle is optimized for supporting substantial axial loads.
- Precision Performance: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications requiring high rotational accuracy.
- Optimized High-Speed Capability: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 11,000 rpm.
- Premium Material Construction: Both rings and balls are made from high-grade chrome steel, providing excellent durability, wear resistance, and a long operational lifespan under heavy loads.
71930 ACD/P4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-rigidity applications, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Rotary Axes
