S71918 CD/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71918 CD/P4A
Basic Information
System of measurement
Metric
Weight
0.57 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.009mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
26
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
10688 lbf
Radial static load rating
11475 lbf
Limiting speed
9.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1309.03
/ each
In Stock
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S71918 CD/P4A Bearing Product Overview & Core Advantages
The S71918 CD/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. Engineered to the P4 (ABEC-7) tolerance class, this bearing excels at handling combined loads, supporting significant radial loads and thrust loads in one direction. Its compact design, featuring an 18 mm width, makes it ideal for space-constrained, high-speed spindles and precision machinery where high rigidity and rotational accuracy are paramount.
S71918 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Benefit |
|---|---|---|
| CD | Matched Bearing Set (Duplex) | Indicates the bearing is supplied as a pre-loaded duplex pair, optimized for maximum rigidity and precise axial positioning. |
| P4A | Tolerance Class (ABEC-7) | Denotes a super-precision grade with extremely tight dimensional and running accuracy tolerances for superior performance in high-speed applications. |
S71918 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The duplex "CD" arrangement provides a consistent, factory-set preload, eliminating internal clearance and resulting in exceptional system stiffness, which is critical for minimizing deflection under load.
- Superior Load Capacity: With a 15° contact angle, the bearing is optimized to handle high combined radial and axial loads simultaneously. The dynamic load rating of 10,688 lbf ensures long service life under demanding conditions.
- High-Speed Performance: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to the high limiting speed of 9,500 rpm.
- Sealed & Lubricated for Life: As a sealed unit, it is protected from contamination and comes pre-lubricated, offering a maintenance-free solution within its specified temperature range of -30° to 110 °C.
S71918 CD/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
