71918 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71918 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
2.2 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 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
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
26325 lbf
Radial static load rating
43425 lbf
Limiting speed
15 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
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.
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
71918 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71918 ACD/P4AQBCA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a Quadruplex Back-to-Back (QBC) matched set, this bearing is engineered to handle combined loads—significant radial and axial loads in both directions—simultaneously. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed, high-reliability machinery where minimal runout and maximum system stiffness are critical.
71918 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class with enhanced running accuracy and dimensional stability. |
| QBC | Signifies the bearing is one of four in a Quadruplex Back-to-Back matched arrangement, optimized for high rigidity and moment load capacity. |
71918 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement provides exceptional system stiffness, enabling the bearing set to withstand heavy combined loads and moment loads. The 25° contact angle is optimized for supporting substantial axial loads in both directions.
- Precision & High-Speed Performance: Manufactured to P4A tolerance standards, this bearing guarantees minimal vibration and precise operation. The phenolic cage contributes to smooth operation at high speeds, with a limiting speed of 15,000 rpm.
- Superior Material & Construction: Components made from chrome steel offer high fatigue life and durability. The open seal type, combined with pre-lubrication, is suitable for controlled environments where maximum speed and low operating torque are prioritized.
- Matched Set Consistency: As part of a factory-matched set of four bearings, consistent preload and performance are ensured, simplifying installation and guaranteeing optimal system performance.
71918 ACD/P4AQBCA Bearing Typical Application Areas
This high-precision bearing is ideally suited for demanding applications in:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Gearboxes: Especially in industrial robotics and automation where high torque and minimal deflection are critical.
- High-Frequency Spindles: Used in PCB drilling and precision engraving machines.
- Medical Equipment: In high-speed centrifuges and advanced imaging systems.
