S7209 CD/HCP4AQBCA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7209 CD/HCP4AQBCA
Basic Information
System of measurement
Metric
Weight
1.39 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.004mm to 0
Width
76 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
25200 lbf
Radial static load rating
28125 lbf
Limiting speed
46 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
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
Price available upon request.
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S7209 CD/HCP4AQBCA Bearing Product Overview & Core Advantages
The S7209 CD/HCP4AQBCA is a high-precision quadruplex back-to-back angular contact ball bearing designed for extreme rigidity and accuracy. This metric system bearing features a sealed design and is preloaded to Extra Light / Class A standards, making it ideal for applications demanding exceptional rotational accuracy and minimal deflection. Its ceramic ball construction and P4A tolerance class ensure superior performance in high-speed and thermally stable environments. The primary advantage of this matched set is its ability to handle combined loads (radial and axial) simultaneously with maximum stiffness, providing a compact and highly reliable solution for the most demanding precision machinery.
S7209 CD/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7209 CD/HCP4A | Denotes a 45mm bore, 85mm OD bearing with a 15° contact angle, manufactured to ABEC 7 / P4A precision tolerances. |
| QBC | Indicates a Quadruplex Back-to-Back matched arrangement. Four bearings are supplied as a pre-matched set. |
| Sealed | Specifies that the bearing is equipped with integral seals to protect against contamination and retain lubricant. |
S7209 CD/HCP4AQBCA Bearing Structural Features & Performance Benefits
- Extreme Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an exceptionally rigid bearing system capable of supporting high combined radial and axial loads from both directions, resisting moment loads effectively.
- High-Speed & Thermal Stability: The use of ceramic balls (typically Silicon Nitride) reduces centrifugal forces, lowers operating temperature, and allows for higher limiting speeds (46,000 rpm). The phenolic cage offers excellent strength-to-weight ratio and is suitable for high-speed operation.
- Ultra-Precision: Manufactured to P4A tolerance class with an Extra Light preload, this bearing ensures minimal runout and vibration, which is critical for achieving the highest levels of machining and positioning accuracy.
- Long Service Life & Reliability: The sealed design protects the precision internals from contaminants, while the pre-applied grease lubrication is suitable for the specified temperature range (-30°C to 110°C), contributing to maintenance-free operation.
S7209 CD/HCP4AQBCA Bearing Typical Application Areas
This bearing is engineered for the most demanding high-precision and high-speed applications, including:
- Machine Tool Spindles: For CNC milling centers, grinding spindles, and high-speed lathes requiring utmost accuracy and rigidity.
- Precision Robotic Drives: In robotic arms and joints where high moment load capacity and positional repeatability are essential.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and other instrumentation requiring reliable performance under demanding conditions.
- High-Frequency Motor Spindles: For applications where high rotational speed and thermal stability are paramount.
