S71917 ACD/P4AQBTB
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71917 ACD/P4AQBTB
Basic Information
System of measurement
Metric
Weight
2.16 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
120 mm
Outside diameter tolerance
-0.004mm to 0
Width
72 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
25650 lbf
Radial static load rating
41175 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
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.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
S71917 ACD/P4AQBTB Bearing Product Overview & Core Advantages
The S71917 ACD/P4AQBTB is a super-precision angular contact ball bearing designed for the most demanding applications. This quadruplex matched set in a tandem back-to-back (QBT) arrangement delivers exceptional system rigidity and axial load capacity. Manufactured to P4A tolerance class and preloaded to Light / Class B, it ensures outstanding running accuracy and positional stability. Its sealed design and phenolic cage make it ideal for high-speed spindle applications requiring long-term, maintenance-free operation.
Model Code Breakdown
| S71917 | Basic designation for a 85mm bore, 120mm OD super-precision angular contact ball bearing. |
| ACD | 25° contact angle, optimized for high axial load capacity and high-speed performance. |
| P4A | Indicates a high-precision tolerance class with enhanced running accuracy and dimensional stability. |
| QBTB | Specifies a Quadruplex Tandem Back-to-Back matched set arrangement, providing maximum system rigidity. |
S71917 ACD/P4AQBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The quadruplex QBT arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads (radial and axial) from multiple directions, ensuring minimal deflection under operational stresses.
- Super-Precision Performance: Manufactured to P4A tolerance class with a Light preload, this bearing guarantees ultra-smooth rotation, high running accuracy, and precise axial positioning, which is critical for machine tool spindles.
- Optimized High-Speed Capability: The lightweight phenolic cage and 25° contact angle are engineered for high-speed operation, reducing centrifugal forces and maintaining stability at the limiting speed of 28,000 rpm.
- Sealed & Ready-to-Use: The sealed design with pre-applied grease lubrication protects against contamination and provides a long service life, making it a maintenance-free solution within its specified temperature range.
S71917 ACD/P4AQBTB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where extreme precision, rigidity, and speed are non-negotiable. Key applications include:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Speed Machining Centers
- Other advanced industrial machinery requiring super-precision rotary axes
