71918 ACD/HCP4ALDT
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71918 ACD/HCP4ALDT
Basic Information
System of measurement
Metric
Weight
0.94 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
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
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71918 ACD/HCP4ALDT Bearing Product Overview & Core Advantages
The 71918 ACD/HCP4ALDT is a super-precision angular contact ball bearing designed for the most demanding applications. This duplex tandem (DT) matched set is preloaded and manufactured to P4A tolerance class, ensuring exceptional running accuracy and system rigidity. Its core advantages include the ability to handle high combined loads (radial and axial) in one direction, superior high-speed performance enabled by a phenolic cage and ceramic balls, and outstanding operational stability for mission-critical spindle systems.
71918 ACD/HCP4ALDT Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Benefit |
|---|---|---|
| ACD | Angular Contact, 25° Contact Angle, Duplex Tandem Arrangement | Optimized for high unidirectional axial load capacity and maximum system rigidity. |
| HC | Hybrid Ceramic (Ceramic Balls, Steel Rings) | Reduced friction, higher limiting speed, longer service life, and non-conductive properties. |
| P4A | ABEC 7 / ISO P4A Tolerance Class | Guarantees ultra-precise dimensions and runout for superior rotational accuracy. |
| L | Light Preload | Eliminates internal clearance for immediate precision and high stiffness under load. |
| DT | Duplex Tandem (Matched Set of 2 Bearings) | Doubles the axial load capacity in one direction, supplied as a ready-to-install, precision-matched pair. |
71918 ACD/HCP4ALDT Bearing Structural Features & Performance Benefits
- Ultra-High Rigidity & Load Capacity: The duplex tandem arrangement creates an exceptionally rigid bearing system, effectively doubling the axial load capacity in one direction. This makes it ideal for resisting heavy combined loads encountered in high-performance spindles.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers operating temperatures and inertial forces, enabling a high limiting speed of 15,000 rpm.
- Enhanced Precision and Longevity: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The 25° contact angle provides an optimal balance between radial and axial load capacity. The open seal design is supplied lubricated for immediate operation in controlled environments.
- Preloaded for Immediate Precision: The bearing set comes with a light preload (L), eliminating internal clearance. This ensures precise shaft positioning, improved dynamic response, and consistent performance from startup.
71918 ACD/HCP4ALDT Bearing Typical Application Areas
This super-precision angular contact ball bearing is engineered for high-performance machinery requiring extreme accuracy, speed, and rigidity. Key applications include:
- Machine Tool Spindles: High-speed CNC milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors operating at very high RPM.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
