7018 ACD/P4AQBCA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
4.63 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
96 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
44775 lbf
Radial static load rating
65250 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
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
Price available upon request.
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7018 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 7018 ACD/P4AQBCA is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing is configured in a back-to-back (QBC) matched set of four bearings, enabling it to withstand significant combined loads (radial and axial) from both directions. Its extra light preload (Class A) ensures minimal runout and high rotational accuracy, making it ideal for high-speed, high-precision spindles and other critical machinery where high rigidity and positional stability are paramount.
7018 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7018 ACD/P4AQBCA is decoded as follows:
- 7018: Basic series designation, indicating a metric angular contact ball bearing with a 90mm bore and 140mm outside diameter.
- A: Denotes a 25° contact angle, optimized for carrying higher axial loads.
- C: Indicates the use of a phenolic (polyamide) cage, which is lightweight and suitable for high-speed operation.
- D: Signifies that the bearing is supplied lubricated from the factory.
- P4A: The tolerance class, specifying extremely tight dimensional and running accuracy standards superior to ABEC 7.
- QBC: Defines the matched arrangement as a Quadruplex (set of four) Back-to-Back configuration. This arrangement provides high moment stiffness.
7018 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of supporting heavy combined radial and axial loads and resisting moment loads. The 25° contact angle further enhances axial load carrying capacity.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing ensures minimal vibration and precise shaft positioning. The lightweight phenolic cage (C) reduces centrifugal forces, contributing to a high limiting speed of 16,000 rpm.
- Optimized for Precision Applications: The extra light preload (Class A) is applied to eliminate internal clearance, resulting in superior rotational accuracy and stiffness without generating excessive heat, which is critical for high-speed spindle performance.
- Superior Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
7018 ACD/P4AQBCA Bearing Typical Application Areas
This bearing is engineered for the most demanding precision applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Machining Centers
- Advanced Robotics and Precision Actuators
- Aerospace and Defense Positioning Systems
