71918 ACE/HCP4ALDT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71918 ACE/HCP4ALDT
Basic Information
System of measurement
Metric
Weight
0.92 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
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
10530 lbf
Radial static load rating
10238 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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
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71918 ACE/HCP4ALDT Bearing Product Overview & Core Advantages
The 71918 ACE/HCP4ALDT is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional speed capability and rigidity. As a duplex tandem (DT) matched pair, this bearing is preloaded to deliver superior axial and radial stiffness, making it ideal for machine tool spindles and other high-performance machinery. Its construction with ceramic balls and a phenolic cage enables significantly higher limiting speeds and reduced rotational inertia. The bearing comes pre-lubricated and is manufactured to a P4A tolerance class, ensuring ultra-precision operation and reliable performance under combined loads.
71918 ACE/HCP4ALDT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 36mm width). |
| ACE | Signifies a 25° contact angle and specific internal design optimized for high-speed operation. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride), which reduce friction and weight. |
| P4A | Denotes an ultra-precision tolerance class with enhanced running accuracy and dimensional stability. |
| L | Specifies a light preload applied to the bearing set, increasing system rigidity. |
| DT | Identifies the Duplex Tandem arrangement, where two bearings are matched to primarily handle thrust loads in the same direction. |
71918 ACE/HCP4ALDT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and built-in preload create an exceptionally stiff bearing system, capable of handling significant combined radial and axial loads with minimal deflection.
- Superior High-Speed Performance: The combination of hybrid ceramic balls and a lightweight phenolic resin cage minimizes centrifugal forces and friction, enabling a very high limiting speed of 15,000 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class standards, this bearing ensures minimal runout and vibration, which is critical for applications demanding high rotational accuracy.
- Optimized for Performance: The 25° contact angle provides an excellent balance between radial and axial load capacity, making it suitable for complex load conditions.
71918 ACE/HCP4ALDT Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Frequency Motors & Spindles: Electric motors and spindles operating at extreme rotational speeds.
