7218 ACD/HCP4ATBTB
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7218 ACD/HCP4ATBTB
Basic Information
System of measurement
Metric
Weight
5.5 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
90 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
59625 lbf
Radial static load rating
72000 lbf
Limiting speed
17 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
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7218 ACD/HCP4ATBTB Bearing Product Overview & Core Advantages
The 7218 ACD/HCP4ATBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This triplex matched set, arranged in a Back-to-Back (TBT) configuration, provides superior stiffness and stability under combined loads (radial and axial). Manufactured to a P4A tolerance class, it ensures high running accuracy. The use of ceramic balls and a phenolic cage enables outstanding high-speed performance, making it ideal for high-precision, high-reliability machinery.
7218 ACD/HCP4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing series, with 90 mm bore diameter and 160 mm outside diameter. |
| ACD | Angular Contact Design with a 25° contact angle. |
| HC | Hybrid Ceramic, indicating the use of ceramic balls. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| TBT | Triplex Back-to-Back matched set arrangement. |
| B | Indicates a Light preload (Class B). |
7218 ACD/HCP4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and maintains shaft positioning under combined loads.
- Superior High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers friction and temperature rise, enabling a high limiting speed of 17,000 rpm.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle significant axial loads in one direction while supporting substantial radial loads, with a high dynamic load rating of 59,625 lbf.
- Precision Performance: Manufactured to P4A tolerance standards with strict bore and OD tolerances, this bearing ensures minimal runout and vibration for ultra-precise applications.
- Pre-lubricated: Comes lubricated from the factory for immediate operation within the specified temperature range.
7218 ACD/HCP4ATBTB Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are critical. Key industries and machinery include:
- 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 flight control mechanisms.
- High-Frequency Motors and Spindles: PCB drilling spindles and electric motor spindles.
