S71911 ACD/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71911 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.37 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
26 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6660 lbf
Radial static load rating
6188 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S71911 ACD/P4ADBB Bearing Product Overview & Core Advantages
The S71911 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. This back-to-back (DB) matched set is preloaded to Light / Class B standards, ensuring optimal performance under combined radial and axial loads. Manufactured to ABEC 7 / P4A tolerance class, it delivers high rotational accuracy and stability, making it ideal for high-speed, high-precision machinery where reliability is critical.
S71911 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| S | Stainless Steel Bearing (Note: Specification indicates Chrome Steel, but 'S' prefix typically denotes stainless. Please verify material with manufacturer.) |
| 7 | Angular Contact Bearing |
| 1911 | Dimension Series: 19 (Width Series) & 11 (Bore Code: 55mm) |
| ACD | 25° Contact Angle, Duplex Back-to-Back (DB) Arrangement |
| P4A | High Precision Tolerance Class (Equivalent to ABEC 7) |
| DBB | Duplex Back-to-Back Matched Set (Two Bearings) |
S71911 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection, providing exceptional operational stability.
- Superior Load Capacity: With a 25° contact angle, this bearing is engineered to handle significant combined loads (radial and axial loads simultaneously) in both directions.
- Optimized High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling higher limiting speeds (34,000 rpm). The precision P4A grading further minimizes vibration at high rotational speeds.
- Sealed & Pre-Lubricated: As a sealed bearing pre-lubricated with grease, it is protected from contamination and offers long-term, maintenance-free operation within its specified temperature range of -30°C to 110°C.
- Precision Engineering: Manufactured from chrome steel with tight dimensional tolerances on the bore, outside diameter, and width, ensuring precise fit and consistent performance in demanding applications.
S71911 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications requiring high rigidity, speed, and accuracy, including:
- Machine Tool Spindles (High-speed milling, grinding spindles)
- Precision Gearboxes and Transmission Systems
- High-Frequency Motor Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Positioning Systems
- Medical and Laboratory Equipment
