7018 CD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 CD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
3.47 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
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
72 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
38700 lbf
Radial static load rating
51300 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
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
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7018 CD/P4ATBTB Bearing Product Overview & Core Advantages
The 7018 CD/P4ATBTB is a precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing arrangement is designed to handle significant combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it offers superior running accuracy, making it ideal for high-speed, high-precision machinery. The set is pre-lubricated and features a light preload (Class B), ensuring optimal performance and stability from installation.
7018 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the core dimensions: 90mm bore, 140mm OD, 24mm single width. |
| CD | Indicates a universal matched set with a specific preload and axial/radial clearance. |
| P4A | The tolerance class, denoting very high precision for both bore and outside diameter tolerances. |
| TBT | Specifies the matched arrangement as Triplex Back-to-Back, consisting of three bearings. |
7018 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back configuration creates a highly rigid bearing system capable of withstanding heavy combined loads and moment loads. The 15° contact angle is optimized for supporting substantial axial loads in both directions.
- Precision & High-Speed Performance: The P4A tolerance class ensures minimal runout and vibration, which is critical for high-speed applications up to 15,000 rpm. The phenolic cage contributes to smooth operation at high speeds with low friction.
- Optimized for Stability: The bearings are supplied as a pre-matched and pre-loaded set (Light Preload / Class B), eliminating internal clearance and enhancing shaft positioning accuracy and system stiffness without requiring complex adjustment during installation.
- Durable Construction: Made from chrome steel for both rings and balls, this bearing offers high fatigue life and durability. The open seal type allows for efficient re-lubrication in demanding applications.
7018 CD/P4ATBTB Bearing Typical Application Areas
This precision triplex bearing set is ideally suited for high-performance applications where maximum rigidity and accuracy are paramount. Key industries and machinery include:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-frequency Spindle Drives
- Precision Robotic Arms and Joints
- Advanced Aerospace & Defense Systems
