71807 ACD/P4QBCB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71807 ACD/P4QBCB
Basic Information
System of measurement
Metric
Weight
0.11 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
47 mm
Outside diameter tolerance
-0.004mm to 0
Width
28 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2565 lbf
Radial static load rating
3668 lbf
Limiting speed
56 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
Light / Class B
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
Price available upon request.
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71807 ACD/P4QBCB Bearing Product Overview & Core Advantages
The 71807 ACD/P4QBCB is a precision angular contact ball bearing configured in a quadruplex back-to-back (QBC) matched arrangement. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing is designed to accommodate combined radial and axial loads simultaneously. Manufactured to P4 tolerance class, it guarantees superior running precision and is preloaded for optimal stiffness and minimal deflection under operational stresses. Its compact design and high load-carrying capacity make it an ideal choice for high-performance, space-constrained machinery.
71807 ACD/P4QBCB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71807 ACD/P4QBCB provides detailed technical specifications through its suffixes:
- 71807: Basic series designation for a high-precision, light-weight angular contact ball bearing.
- ACD: Signifies a 25° contact angle, optimized for supporting high axial loads.
- P4: Denotes a superior tolerance class, ensuring extremely tight dimensional and running accuracy for high-precision applications.
- QBC: Indicates the bearing is supplied as part of a Quadruplex Back-to-Back matched set of four bearings, providing maximum system rigidity and moment load capacity.
- B: Specifies a Light preload (Class B) within the matched set, which minimizes axial and radial play for enhanced system stiffness.
71807 ACD/P4QBCB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and significant moment loads. This configuration is essential for applications where shaft deflection must be minimized.
- Precision Performance: Manufactured to P4 tolerance class with a 25° contact angle, this bearing delivers exceptional running accuracy and is optimized for high-speed operation, contributing to smoother machine performance and longer service life.
- Optimized Cage Design: The phenolic resin cage offers excellent strength-to-weight ratio, reduced friction, and is well-suited for high-speed applications, contributing to the bearing's high limiting speed.
- Superior Material: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and consistent performance under the specified temperature range.
71807 ACD/P4QBCB Bearing Typical Application Areas
This high-precision bearing is specifically designed for demanding applications in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring maximum rigidity and accuracy.
- Precision Gearboxes and Robotic Drives where compact, high-stiffness bearing arrangements are critical.
- High-Frequency Motors and Spindles used in the aerospace and semiconductor manufacturing industries.
- Any application requiring a preloaded, matched set of bearings to control shaft displacement and improve system dynamics.
