7018 ACD/P4ATBTC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 ACD/P4ATBTC
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
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
36675 lbf
Radial static load rating
48600 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7018 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 7018 ACD/P4ATBTC is a precision angular contact ball bearing designed for demanding industrial applications requiring exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set of three bearings is engineered to handle combined radial and axial loads simultaneously. With a P4A tolerance class and moderate preload (Class C), it delivers superior rotational accuracy, high system stiffness, and reliable performance in high-speed operations. Its compact design and phenolic cage contribute to its suitability for precision machinery where stability is critical.
7018 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7018 ACD/P4ATBTC is decoded as follows:
- 7018: Basic series designation indicating bore diameter (90 mm) and external dimensions.
- ACD: Angular Contact design with a 25° contact angle.
- P4A: High precision tolerance class, exceeding ABEC 7 standards for runout and dimensional accuracy.
- TBT: Triplex Back-to-Back arrangement, consisting of three bearings matched for optimal load distribution and rigidity.
- C: Indicates Moderate Preload (Class C) for reduced deflection under operational loads.
7018 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back configuration creates an exceptionally rigid bearing system capable of withstanding heavy combined loads and moments. The 25° contact angle is optimized for sustaining significant axial loads in both directions.
- Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, making it ideal for high-precision spindle applications.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at limiting speeds up to 15,000 rpm.
- Optimized Material Selection: Components made from chrome steel provide high hardness and fatigue resistance, while the phenolic cage offers excellent strength-to-weight ratio and smooth operation.
- Preload Advantages: The moderate preload (Class C) minimizes axial and radial play, enhancing system stiffness without generating excessive heat at operating speeds.
7018 ACD/P4ATBTC Bearing Typical Application Areas
This precision bearing set is specifically engineered for applications requiring high rigidity, accuracy, and speed capabilities:
- Machine Tool Spindles: High-precision milling, grinding, and turning centers
- High-Speed Machining Centers: Where dimensional stability and minimal deflection are critical
- Precision Gearboxes and transmission systems
- Industrial Pumps and Compressors requiring high axial stiffness
- Robotic Arm Joints and precision automation equipment
- Aerospace Positioning Systems and navigation instruments
