7217 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7217 ACD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
3.13 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
150 mm
Outside diameter tolerance
-0.004mm to 0
Width
56 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
17
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
35100 lbf
Radial static load rating
38250 lbf
Limiting speed
17 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
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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7217 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7217 ACD/HCP4ADGA is a high-precision, double row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and rigidity. Its design enables it to simultaneously handle significant combined loads (radial and bidirectional axial loads) efficiently. Manufactured to P4A tolerance class, this bearing offers superior running accuracy. The use of a ceramic ball and phenolic cage construction contributes to its capabilities as a high-speed bearing, with a limiting speed of 17,000 rpm. Its universal matchable (SU) designation allows for flexible mounting arrangements in pairs, providing designers with versatile, high-performance solutions for compact spaces.
7217 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7217 ACD/HCP4ADGA provides detailed technical specifications through its suffixes:
- 7217: Basic series number, indicating a metric double row angular contact ball bearing with an 85 mm bore and 150 mm outside diameter.
- ACD: Signifies a 25° contact angle and a universal matchable (SU) design, allowing two bearings to be mounted in either a back-to-back (DB) or face-to-face (DF) configuration.
- HCP4A: Denotes the high-precision tolerance class and material/design features.
- HC: Indicates the use of Hybrid Ceramic balls (Silicon Nitride).
- P4A: Specifies the tolerance class, which is superior to ABEC 7/ISO P4, ensuring extremely tight dimensional and running accuracy.
- DGA: Refers to the preload level.
- A: Indicates an Extra Light preload (Class A).
7217 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The double row design provides a rigid support system, significantly increasing the bearing's capacity to handle combined loads and moment loads compared to single row designs.
- Superior High-Speed Performance: The combination of lightweight ceramic balls and a phenolic resin cage reduces centrifugal forces and inertial mass, enabling stable operation at the high limiting speed of 17,000 rpm. The 25° contact angle is optimized for high-speed applications requiring robust axial load capacity.
- Exceptional Precision: Manufactured to a P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration, which is critical for ultra-precise spindle applications.
- Universal Matching Capability (SU): Bearings are supplied as a matched set of 2 and are universal matchable, simplifying installation and providing design flexibility for achieving the desired preload and stiffness in the application.
7217 ACD/HCP4ADGA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications demanding the utmost in rotational accuracy.
- High-Frequency Motors and Spindles: Where ceramic hybrid technology reduces electrical arcing damage.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
