71918 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 CD/P4A
Basic Information
System of measurement
Metric
Weight
0.55 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
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
16 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:
$ 250.11
/ each
In Stock
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71918 CD/P4A Bearing Product Overview & Core Advantages
The 71918 CD/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing is engineered to handle significant combined loads, including high radial loads and unidirectional axial loads. Its 15° contact angle and preload availability make it an ideal choice for machine tool spindles and other high-speed, high-rigidity systems where precise shaft positioning is critical.
71918 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width) |
| CD | Specific internal design with optimized contact angle and internal clearance for preload applications |
| P4A | Indicates P4 (ABEC-7) tolerance class with specific dimensional and running accuracy requirements |
71918 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The single-row angular contact design with 15° contact angle provides optimal stiffness for applications requiring minimal deflection. Manufactured to P4 tolerance class, it ensures exceptional running accuracy and dimensional stability.
- Superior Load Capacity: Engineered to handle combined radial and axial loads simultaneously, with a dynamic load rating of 10,688 lbf and static load rating of 11,475 lbf, making it suitable for demanding applications.
- High-Speed Performance: The phenolic resin cage contributes to reduced friction and lower operating temperatures, enabling operation at limiting speeds up to 16,000 rpm while maintaining stability.
- Optimized Material Selection: Constructed from chrome steel for both rings and balls, providing excellent wear resistance and durability. The phenolic cage offers superior strength-to-weight ratio and smooth operation at high speeds.
71918 CD/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling applications requiring high rigidity and accuracy
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus demanding P4 tolerance precision
- High-Speed Rotating Equipment: Dental handpieces, small precision motors, and turbochargers where high rotational speeds are critical
- Robotics & Automation: Industrial robot joints, CNC rotary tables, and precision positioning systems requiring angular contact bearing performance
