71918 ACD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 ACD/P4ADGA
Basic Information
System of measurement
Metric
Weight
1.1 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
16380 lbf
Radial static load rating
21712 lbf
Limiting speed
15 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 535.91
/ each
In Stock
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71918 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 71918 ACD/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-lubricated and preloaded duplex set, it is engineered to handle combined loads (radial and axial) simultaneously with exceptional performance. Its P4A tolerance class and optimized internal geometry ensure smooth, quiet operation at high speeds, making it ideal for high-precision, high-reliability machinery where minimal runout and thermal stability are critical.
71918 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71918 ACD/P4ADGA is decoded as follows:
- 71918: Basic series designation for a super-precision angular contact ball bearing.
- A: Denotes a 25° contact angle.
- CD: Indicates a universal matchable (SU) duplex set. Two bearings are "face-to-face" matchable, allowing for flexible mounting configurations to accommodate various load conditions.
- P4A: Specifies the tolerance class, representing extremely tight dimensional and running accuracy standards superior to ABEC 7 / ISO Class 4.
- DGA: Indicates a specific factory-set extra light preload (Class A). This preload eliminates internal clearance, enhancing system rigidity and rotational accuracy from startup.
71918 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Accuracy: The duplex pair configuration and factory-applied extra light preload (DGA) provide a stiff, integral bearing unit that significantly increases system rigidity, reduces deflection under load, and maintains precise shaft positioning.
- Superior Load Capacity: The 25° contact angle and optimized raceway geometry are engineered for excellent performance under combined radial and axial loads.
- High-Speed Capability: The lightweight phenolic resin cage ensures low inertia and excellent guidance, contributing to stable operation at the high limiting speed. The bearing is supplied pre-lubricated for immediate high-speed performance.
- Precision Engineering: Manufactured to P4A tolerance class with a chrome steel construction, this bearing guarantees minimal vibration and long-term dimensional stability.
71918 ACD/P4ADGA Bearing Typical Application Areas
This bearing is ideally suited for high-precision applications, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
