7018 ACE/P4ADT
7000 Series Super Precision Angular Contact Ball Bearings
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7018 ACE/P4ADT Bearing Product Overview & Core Advantages
The 7018 ACE/P4ADT is a duplex tandem (DT) arrangement of two precision angular contact ball bearings, pre-loaded and supplied as a matched set. Engineered to the exacting P4A tolerance class, this assembly is designed for applications demanding extremely high rigidity and exceptional running accuracy. Its primary function is to accommodate combined loads, with a significant capacity for unidirectional axial loads. The compact, pre-configured design ensures optimal performance, making it an ideal solution for high-precision, high-reliability machinery where uncompromising accuracy is paramount.
7018 ACE/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
The model number 7018 ACE/P4ADT provides a detailed technical specification:
- 7018: Basic bearing series, indicating a bore diameter of 90 mm and a specific cross-section.
- ACE: Signifies Angular Contact design with a 25° contact angle and standard internal clearance.
- P4A: Denotes a super-precision tolerance class exceeding ABEC 7, ensuring minimal runout and vibration for ultra-precise applications.
- DT: Indicates a Duplex Tandem arrangement. Two bearings are mounted in tandem to significantly increase axial load capacity in one direction.
Key Features: The bearing is Open (no seals/shields) and pre-lubricated. The Phenolic cage contributes to smooth, high-speed operation.
7018 ACE/P4ADT Bearing Structural Features & Performance Benefits
The design of the 7018 ACE/P4ADT delivers distinct performance advantages:
- Maximum Rigidity & Axial Load Capacity: The duplex tandem (DT) arrangement combines two bearings to create an exceptionally rigid unit capable of supporting very high unidirectional axial loads. This configuration is essential for preventing axial play under heavy loads.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and superior rotational accuracy, which is critical for applications like machine tool spindles.
- Optimized High-Speed Capability: The lightweight and robust Phenolic cage, combined with the 25° contact angle and open design, allows for a high limiting speed of 15,000 rpm, reducing friction and heat generation.
- High Dynamic Capacity: With a dynamic load rating of 12,442 lbf, the bearing is built for long service life under demanding operating conditions.
7018 ACE/P4ADT Bearing Typical Application Areas
The 7018 ACE/P4ADT is specified for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: In PCB drilling, semiconductor manufacturing, and other precision engineering equipment.
- High-Frequency Motors and Spindle Drives.
- Axial Compressors and Pumps requiring high axial stiffness.
