71936 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71936 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
16.8 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
180 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
250 mm
Outside diameter tolerance
-0.004mm to 0
Width
132 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
27
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
95175 lbf
Radial static load rating
180000 lbf
Limiting speed
16.25 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
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
In Stock
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71936 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71936 ACD/P4AQBCA is a super-precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. Engineered to the exacting P4A tolerance class, this bearing is designed for applications demanding exceptional rotational accuracy, high system rigidity, and the ability to handle complex combined loads. Its primary advantage lies in its pre-optimized matched arrangement, which ensures optimal load distribution and superior operational stability under high-speed conditions.
71936 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71936 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a duplex pair of bearings. |
| /P4A | Indicates a super-precision tolerance class (P4A), exceeding normal P4 standards for enhanced running accuracy. |
| QBC | Defines the matched arrangement as Quadruplex Back-to-Back, consisting of four bearings arranged as two back-to-back pairs. |
71936 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- Extreme Rigidity and Moment Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement provides an exceptionally rigid bearing system, highly effective at resisting moment loads and maintaining shaft positioning under heavy combined radial and axial loads.
- Super-Precision Performance: Manufactured to P4A tolerance class with an Extra light (Class A) preload, this bearing ensures minimal runout and vibration, which is critical for high-precision applications.
- High-Speed Capability: The lightweight and robust phenolic resin cage minimizes centrifugal forces, contributing to a high limiting speed and stable operation at 16,250 rpm.
- Optimized Internal Geometry: With 27 precision balls made of chrome steel and a specific contact angle of 25°, the bearing is optimized for high axial load capacity and smooth operation.
- Pre-lubricated & Ready-to-Mount: The bearing is supplied lubricated and pre-configured as a set, simplifying installation and ensuring immediate, reliable performance.
71936 ACD/P4AQBCA Bearing Typical Application Areas
This high-performance bearing is ideally suited for the most demanding applications, including:
- High-Precision Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial High-Frequency Motors
- Aerospace and Defense Positioning Systems
