S71912 ACD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71912 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
0.78 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.004mm to 0
Width
52 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
11115 lbf
Radial static load rating
13162 lbf
Limiting speed
36 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
Price available upon request.
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S71912 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The S71912 ACD/P4AQBCA is a super-precision angular contact ball bearing designed for the most demanding applications. This P4A tolerance class quadruplex set, arranged in a Back-to-Back (QBC) configuration, delivers exceptional rotational accuracy and system rigidity. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously while maintaining high-speed performance and thermal stability, making it ideal for high-precision spindles requiring maximum stiffness and running accuracy.
S71912 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
The model number S71912 ACD/P4AQBCA is decoded as follows:
- S7: High-precision bearing series
- 1912: Standardized size code (Bore: 60mm, OD: 85mm, Width: 52mm)
- ACD: 25° contact angle design, optimized for high rigidity and axial load capacity
- P4A: Extra high precision tolerance class, exceeding ABEC 7/ISO P4 standards
- QBC: Quadruplex Back-to-Back matched set arrangement, providing superior system rigidity and moment load capacity
S71912 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of supporting heavy combined loads and significant moment loads. The 25° contact angle is specifically chosen to provide excellent axial load carrying capacity.
- Super-Precision Performance: Manufactured to P4A tolerance class with an Extra Light (A) preload, this bearing ensures minimal runout and vibration, which is critical for achieving superior surface finishes and positioning accuracy in machine tool applications.
- Optimized High-Speed Capability: The phenolic resin cage offers low weight and excellent sliding properties, contributing to lower friction and higher limiting speeds (36,000 rpm). The grease lubrication is suitable for the specified operating range.
- Premium Material Construction: Made from chrome steel for both rings and balls, ensuring high durability, wear resistance, and long service life under demanding conditions.
S71912 ACD/P4AQBCA Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where extreme precision, rigidity, and speed are paramount. Key applications include:
- High-Frequency Machine Tool Spindles: For CNC milling, grinding, and turning centers.
- Precision Grinding Spindles: Where the highest levels of running accuracy are required.
- High-Speed Machining Centers: Demanding applications involving combined loads at high rotational speeds.
- Other Precision Rotary Systems: Including high-speed pumps, compressors, and specialized instrumentation.
