7218 ACDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7218 ACDGB/HCP4A
Basic Information
System of measurement
Metric
Weight
1.83 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
30 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
27225 lbf
Radial static load rating
23850 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7218 ACDGB/HCP4A Bearing Product Overview & Core Advantages
The 7218 ACDGB/HCP4A 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 supplied as part of a Universal Matchable (SU) set, allowing for precise preload configuration when mounted with its matched counterparts. Its core advantages include superior high-speed capability with a limiting speed of 17,000 rpm, high rigidity from its optimized internal geometry, and the ability to accommodate combined radial and axial loads simultaneously. Manufactured to a P4A tolerance class, it guarantees ultra-precise running accuracy for critical machinery.
7218 ACDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7218 ACDGB/HCP4A provides detailed technical specifications through its suffixes:
- 7218: Basic designation indicating a metric series bearing with a 90mm bore and 160mm outside diameter.
- AC: Angular Contact design, optimized for combined loads.
- D: Signifies a specific internal design and contact angle (25° in this case).
- GB: Indicates a Light preload (Class B).
- /HC: Denotes the use of Hybrid Ceramic components (Ceramic balls with steel rings).
- P4A: Specifies the tolerance class, denoting very high running accuracy and dimensional precision.
7218 ACDGB/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This construction enhances high-speed performance, extends service life, and provides superior resistance to electrical erosion.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent guidance of the ceramic balls at high rotational speeds, contributing to smooth operation and low vibration.
- High Rigidity and Load Capacity: The 25° contact angle and precision-ground raceways provide high rigidity, enabling the bearing to support substantial combined radial and axial loads. With a dynamic load rating of 27,225 lbf, it is built for longevity under strenuous conditions.
- Ultra-Precision P4A Tolerance: Manufactured to the strictest P4A tolerance class, this bearing guarantees minimal runout and exceptional dimensional stability, which is critical for applications requiring the highest levels of precision.
- Universal Matching (SU): Supplied in a set of three, these bearings are universally matchable, allowing for flexible mounting arrangements (DB, DF, DT) to achieve the desired preload and system stiffness.
7218 ACDGB/HCP4A Bearing Typical Application Areas
This high-performance bearing is ideally suited for applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Frequency Motors and Spindles: Electric vehicle motors, dental handpieces, and small turbine spindles.
