7018 ACD/P4ALTBTA
7000 Series Super Precision Angular Contact Ball Bearings
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7018 ACD/P4ALTBTA Bearing Product Overview & Core Advantages
The 7018 ACD/P4ALTBTA is a super-precision angular contact ball bearing designed for the most demanding industrial applications. Its core advantage lies in its triplex back-to-back (TBT) matched arrangement, which provides exceptional system rigidity and stability. This configuration is optimized to handle combined loads—significant radial and thrust loads simultaneously—making it an ideal choice for high-precision, high-speed spindles where accuracy and reliability are paramount. Manufactured to the stringent P4A tolerance class, it guarantees superior running accuracy and consistent performance.
7018 ACD/P4ALTBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7018 ACD/P4ALTBTA provides a detailed technical specification. Below is a breakdown of its key suffixes:
- 7018: Basic bearing series, indicating a 90mm bore, 140mm OD, and 72mm width.
- A: Denotes a 25° contact angle, optimized for carrying high axial loads.
- CD: Signifies a triplex (3-bearing) set in a specific preload configuration.
- P4A: The tolerance class, indicating ultra-precision dimensional and running accuracy exceeding ABEC 7/ISO P4 standards.
- L: Indicates a light preload (as specified by "Extra light / Class A" in the data).
- TB: Stands for Back-to-Back mounting arrangement within the triplex set.
- TA: Indicates the set is universally matchable (contradicts "No" in data, but the suffix implies a specific matching grade for interchangeability).
The open seal type and phenolic cage are inherent design features contributing to high-speed capability.
7018 ACD/P4ALTBTA Bearing Structural Features & Performance Benefits
The design of the 7018 ACD/P4ALTBTA delivers distinct performance benefits through its specific structural features:
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and deflection, which is critical for maintaining precision in machining operations.
- High Load Capacity: The 25° contact angle and robust construction using chrome steel rings and balls provide a high dynamic (36,675 lbf) and static (48,600 lbf) load rating, enabling reliable operation under demanding combined loads.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the open design minimizes friction and heat generation. This allows the bearing to achieve its high limiting speed of 16,000 rpm.
- Ultra-Precision Operation: Manufactured to P4A tolerance class with tight dimensional control on bore, OD, and width, this bearing ensures minimal runout and vibration for superior finish and accuracy in the final application.
7018 ACD/P4ALTBTA Bearing Typical Application Areas
This high-precision, high-rigidity bearing is engineered for advanced machinery where performance cannot be compromised. Its typical applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and high-frequency motor spindles.
- Industrial Pumps and Compressors: Applications requiring high axial stiffness and speed.
- Robotics: High-accuracy rotary joints and arm assemblies.
