7219 CD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7219 CD/HCP4ADBB
Basic Information
System of measurement
Metric
Weight
4.41 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
95 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
170 mm
Outside diameter tolerance
-0.004mm to 0
Width
64 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
23.812 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
50625 lbf
Radial static load rating
54000 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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
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7219 CD/HCP4ADBB Bearing Product Overview & Core Advantages
The 7219 CD/HCP4ADBB is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, ensuring high system stiffness and minimal axial/radial runout. Its construction with ceramic balls and a phenolic cage enables superior high-speed performance and thermal stability. This bearing is engineered to handle combined radial and axial loads simultaneously, making it ideal for high-precision, high-reliability machinery.
7219 CD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7219 CD/HCP4ADBB is decoded as follows:
- 7219: Basic series designation for a double row angular contact ball bearing with a 95mm bore.
- C: Denotes a 15° contact angle, optimized for high-speed applications.
- D: Indicates the bearing is part of a duplex (matched pair) set.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4A: Identifies an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards.
- DB: Specifies the Back-to-Back mounting arrangement.
- B: Indicates the Light preload (Class B).
7219 CD/HCP4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The duplex back-to-back (DB) arrangement and light preload create a highly rigid bearing system that effectively resists moment loads, maintaining exceptional shaft positioning accuracy under combined loads.
- Superior High-Speed Capability: The hybrid ceramic design with silicon nitride balls reduces centrifugal forces, lowers operating temperature, and minimizes friction. Combined with the lightweight, self-lubricating phenolic resin cage, this allows for the high limiting speed of 15,000 rpm.
- Extended Service Life & Reliability: Ceramic balls are harder, more wear-resistant, and electrically insulating compared to steel, leading to significantly longer service life, especially in contaminated or electrically charged environments.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, ensuring consistent, high-performance operation in precision spindles.
7219 CD/HCP4ADBB Bearing Typical Application Areas
This bearing is specifically designed for high-end industrial applications where speed, precision, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Spindles: Applications in PCB drilling, semiconductor manufacturing, and other high-precision processes.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Aerospace & Defense: Gyroscopes, radar systems, and other critical rotating assemblies.
