71818 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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71818 CD/P4DBA Bearing Product Overview & Core Advantages
The 71818 CD/P4DBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stability and is preloaded to Extra Light (Class A) specifications, ensuring minimal axial and radial play under operating conditions. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside thrust loads in both directions—making it an ideal choice for high-precision, high-rigidity systems. Manufactured to P4 tolerance class, it guarantees exceptional running accuracy and consistent performance.
71818 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| 71818 | Basic bearing series and size designation (90mm bore, 115mm OD). |
| C | 15° contact angle, optimized for high-speed applications and combined loads. |
| D | Indicates a duplex pair of bearings. |
| P4 | High precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
| DB | Duplex Back-to-Back arrangement, providing high moment rigidity and stability. |
| A | Specifies the Extra Light preload on the matched set. |
71818 CD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread of the load-carrying balls, significantly increasing the bearing's resistance to moment loads and enhancing overall system stiffness.
- Superior Load Capacity: With a 15° contact angle and a dynamic load rating of 8055 lbf, this bearing is engineered to efficiently support combined radial and axial loads from both directions simultaneously.
- Precision High-Speed Operation: The P4 tolerance class ensures minimal vibration and heat generation. The lightweight phenolic cage is ideal for high-speed applications, contributing to a limiting speed of 15,000 rpm.
- Optimized for Precision: The Extra Light preload (Class A) eliminates internal clearance, resulting in precise shaft positioning, reduced noise, and improved rotational accuracy right from start-up.
- Durable Construction: Components made from chrome steel offer high hardness and wear resistance, ensuring long service life under demanding conditions.
71818 CD/P4DBA Bearing Typical Application Areas
The 71818 CD/P4DBA is specified for high-precision machinery and systems where accuracy, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: For CNC milling centers, grinding machines, and lathes requiring high rotational accuracy and stiffness.
- Precision Gearboxes: Especially in high-speed transmission systems.
- Industrial Pumps and Compressors: Where reliable performance under combined loads is critical.
- Robotic Arms and Precision Actuators: For accurate positioning and moment load resistance.
- Aerospace and Defense Instrumentation: In gyroscopes, radar systems, and other high-reliability equipment.
