7218 ACD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7218 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
4.53 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
160 mm
Outside diameter tolerance
-0.004mm to 0
Width
60 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
44775 lbf
Radial static load rating
47700 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
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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7218 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7218 ACD/P4ADBB is a precision angular contact ball bearing configured in a duplex back-to-back (DB) arrangement. This matched pair is designed for applications requiring exceptional rotational accuracy and high system rigidity. The bearings are manufactured to a P4A tolerance class and come with a light preload (Class B), making them ideal for machine tool spindles and other high-performance machinery where precise shaft positioning and stability under combined loads are critical. Their duplex design enables them to support substantial radial loads and bidirectional axial loads simultaneously.
7218 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7218 ACD/P4ADBB provides specific technical details:
- 7218: Basic bearing series, indicating a 90 mm bore, 160 mm outside diameter, and medium cross-section.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates the bearing is part of a Duplex (matched pair) set.
- P4A: Denotes a very high precision tolerance class, exceeding ABEC 7 standards, for superior running accuracy.
- DB: Specifies the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
- Open / Lubricated: The bearing is supplied lubricated and features an open (unsealed) design for high-speed applications.
7218 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back configuration creates a wide, rigid support system that effectively resists moment loads and tilting. This setup allows the bearing pair to handle significant combined radial and axial loads from both directions.
- High-Speed Capability: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smooth operation at the high limiting speed of 17,000 rpm. The open design and optimized internal geometry further enhance high-speed performance.
- Precision Performance: Manufactured to P4A tolerance standards, these bearings ensure minimal runout and vibration, which is essential for applications demanding extreme rotational accuracy.
- Durable Construction: Components made from chrome steel provide high hardness, wear resistance, and a long operational life under demanding conditions.
7218 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing set is engineered for advanced industrial applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors requiring precise shaft control.
- Aerospace & Defense positioning systems and auxiliary equipment.
