71956 ACD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71956 ACD/P4ADGA
Basic Information
System of measurement
Metric
Weight
25.8 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
280 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
380 mm
Outside diameter tolerance
-0.004mm to 0
Width
92 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
99450 lbf
Radial static load rating
194625 lbf
Limiting speed
7.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 4458.65
/ each
In Stock
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71956 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 71956 ACD/P4ADGA is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high rigidity. Manufactured to P4A tolerance class, this bearing features a 25° contact angle and an extra light preload (Class A), making it ideal for high-speed spindles and other precision machinery. Its universal matchable (SU) design allows for flexible mounting arrangements in pairs to support combined loads, including significant axial loads in both directions. The open design, combined with a phenolic cage, facilitates optimal lubrication for sustained high-speed operation.
71956 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71956 ACD/P4ADGA provides detailed technical specifications through its suffixes:
- 71956: Basic model number denoting a metric series, double-row angular contact ball bearing with a 280 mm bore.
- ACD: Signifies a 25° contact angle and a specific internal design optimized for high-speed performance.
- P4A: Indicates a very high precision tolerance class, exceeding ABEC 7 standards, for applications requiring minimal runout and vibration.
- DGA: Denotes a specific internal clearance and preload group (Extra light / Class A), ensuring optimal performance under high-speed, low-heat generation conditions.
71956 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double-row design with a 25° contact angle provides high radial and axial rigidity, capable of handling combined loads efficiently. With a dynamic load rating of 99,450 lbf and a static load rating of 194,625 lbf, it offers robust performance in demanding applications.
- High-Speed Performance: The phenolic cage reduces centrifugal forces and friction, contributing to a high limiting speed of 7,500 rpm. The open structure allows for efficient lubrication management, critical for heat dissipation at high rotational speeds.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, ensuring precise shaft positioning and smooth operation.
- Universal Matching: Designed as a Universal Matchable (SU) bearing, two bearings can be paired in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement without selective matching, simplifying installation and maintenance.
71956 ACD/P4ADGA Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in semiconductor manufacturing, PCB drilling, and other high-accuracy machining.
- High-Speed Motors and Pumps requiring reliable operation under combined loads.
- Aerospace and Medical Equipment where precision, reliability, and high-speed capability are critical.
