S71926 ACD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71926 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
6.32 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
130 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
180 mm
Outside diameter tolerance
-0.004mm to 0
Width
96 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
27
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
51525 lbf
Radial static load rating
91125 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Grease
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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S71926 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The S71926 ACD/P4AQBCA is a precision angular contact ball bearing configured in a quadruplex back-to-back (QBC) matched set. Engineered for exceptional performance, this bearing is designed to handle combined loads—significant radial loads and bidirectional axial loads—simultaneously. Its P4A super-precision tolerance and extra light preload (Class A) ensure ultra-high running accuracy, minimal vibration, and superior rotational stability, making it ideal for demanding, high-rigidity applications requiring maximum system stiffness and positional accuracy.
Model Code Breakdown
The model number S71926 ACD/P4AQBCA is decoded as follows:
- S7: Series designation for high-precision angular contact ball bearings.
- 1926: Standard size code; Bore diameter: 130 mm, Outside diameter: 180 mm, Width: 96 mm.
- ACD: Contact angle of 25° and specific internal design optimizations.
- P4A: Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards.
- QBC: Indicates the bearing is part of a Quadruplex Back-to-Back matched set of 4 bearings.
- Additional Inherent Features:
- Sealed: Integrated seals for contaminant exclusion and lubricant retention.
- Cage Material: Phenolic: A lightweight, robust cage material ideal for high-speed operation.
- Lubrication: Grease: Pre-lubricated for immediate operation and long service life.
S71926 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- Ultra-High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system, capable of supporting high moment loads and heavy combined radial and axial loads. The 25° contact angle is optimized for axial load carrying capability.
- Super-Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0), ensuring exceptional running accuracy, reduced noise, and minimal non-repetitive runout (NRRO) for critical spindle applications.
- High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to lower centrifugal forces and friction, enabling a high limiting speed of 11,000 rpm.
- Enhanced Service Life & Reliability: The sealed design protects the high-grade chrome steel components from contaminants, while the pre-applied grease lubrication provides reliable operation across a wide temperature range (-30°C to 110°C), promoting long, maintenance-free service intervals.
S71926 ACD/P4AQBCA Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, jig borers, and coordinate measuring machines.
- High-Frequency Motors: Spindles for high-RPM electric motors.
- Robotics: High-accuracy rotary joints and arm actuators.
