7018 ACDGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7018 ACDGA/HCP4AL
Basic Information
System of measurement
Metric
Weight
1.01 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
24 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
16672 lbf
Radial static load rating
16200 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7018 ACDGA/HCP4AL Bearing Product Overview & Core Advantages
The 7018 ACDGA/HCP4AL is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single bearing features a 25° contact angle and is manufactured to P4A tolerance class, delivering superior running accuracy. Its core advantages include the ability to accommodate combined radial and axial loads simultaneously, high-speed capability up to 15,000 rpm, and outstanding operational stability due to its ceramic ball and phenolic cage construction. It is pre-lubricated and designed for universal matching (SU), allowing for flexible arrangement in sets of three to optimize preload and system stiffness.
7018 ACDGA/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance |
|---|---|---|
| AC | Angular Contact | Designed to support combined loads with a defined 25° contact angle. |
| DGA | Contact Angle & Preload | Specifies a 25° contact angle and an Extra Light (Class A) preload for minimal friction and high-speed operation. |
| HC | Hybrid Ceramic | Indicates the use of ceramic balls, which reduce weight, lower friction, and allow for higher speeds and longer service life. |
| P4A | Tolerance Class | Denotes a high-precision bearing with extremely tight dimensional and running accuracy tolerances. |
7018 ACDGA/HCP4AL Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls (Si3N4) significantly reduces centrifugal forces, enabling higher limiting speeds (15,000 rpm). This construction also provides superior resistance to wear and operates effectively across a wide temperature range (-30°C to 110°C).
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and guidance at high speeds, contributing to smooth and quiet operation.
- High Rigidity and Load Capacity: The 25° contact angle and precision manufacturing provide high rigidity, capable of handling significant dynamic and static loads (16,672 lbf dynamic / 16,200 lbf static).
- Precision and Universal Matchability: Manufactured to P4A standards, this bearing ensures minimal runout. Its Universal Matchable (SU) designation allows for direct pairing in any combination to form a preloaded set of three bearings, simplifying installation and optimizing system performance.
7018 ACDGA/HCP4AL Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance machinery where speed, accuracy, and reliability are paramount.
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units (APUs).
- High-Frequency Motors and Spindles: Electric motors and spindles for PCB drilling and dental handpieces.
