S7028 CD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7028 CD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
13.8 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
132 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
90675 lbf
Radial static load rating
147375 lbf
Limiting speed
11 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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S7028 CD/P4AQBCC Bearing Product Overview & Core Advantages
The S7028 CD/P4AQBCC is a precision quadruplex matched set of double row angular contact ball bearings, engineered for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing is designed to handle combined loads—significant radial and bidirectional axial loads—simultaneously. Its back-to-back quadruplex (QBC) arrangement provides an extremely high rigidity and stable rotational axis, making it ideal for high-precision, high-reliability machine tool spindles and other critical equipment.
S7028 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7028 | Basic bearing series and size designation (140mm bore, 210mm OD). |
| CD | Indicates a double row angular contact ball bearing with a 15° contact angle. |
| P4A | Denotes a super-precision tolerance class, exceeding normal P4 standards for enhanced running accuracy. |
| QB | Specifies the bearing is supplied as part of a Quadruplex Back-to-Back matched set. |
| CC | Indicates a Moderate preload (Class C) is applied to the matched set for optimal stiffness. |
S7028 CD/P4AQBCC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The quadruplex back-to-back (QBC) arrangement of four bearings creates an exceptionally stiff bearing system that minimizes deflection under heavy combined loads, ensuring precise shaft positioning and rotational stability.
- Superior Load Capacity: As a double row angular contact ball bearing, it is inherently capable of supporting high radial loads and bidirectional axial loads simultaneously, a key advantage over single row designs.
- Optimized High-Speed Performance: The lightweight and robust phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 11,000 rpm. The 15° contact angle is well-suited for high-speed operation.
- Precision & Longevity: Manufactured to P4A super-precision standards with tight dimensional tolerances, this bearing ensures smooth, quiet, and low-vibration operation. The sealed design with pre-applied grease protects against contamination and provides long-term, maintenance-free service within its specified temperature range.
S7028 CD/P4AQBCC Bearing Typical Application Areas
This bearing is specifically designed for the most demanding applications, including:
- High-Precision Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-Speed Machining Centers
- Precision Grinding Spindles
- Other industrial machinery requiring ultra-high rigidity and super-precision rotational accuracy.
