S71918 ACD/HCP4ATT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71918 ACD/HCP4ATT
Basic Information
System of measurement
Metric
Weight
1.43 kg
Tolerance class
P4A
Seal type
Sealed
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
54 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
21510 lbf
Radial static load rating
32175 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Grease
Matched arrangement
Triplex Tandem (3-DT)
Number of bearings in matched set
3
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.
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S71918 ACD/HCP4ATT Bearing Product Overview & Core Advantages
The S71918 ACD/HCP4ATT is a precision angular contact ball bearing designed for the most demanding high-performance applications. This matched set of three bearings in a Triplex Tandem (3-DT) arrangement is engineered to deliver exceptional stiffness and load-carrying capacity. Manufactured to ABEC 7 / P4A tolerance standards, it offers superior running accuracy. A key advantage is its ability to handle combined loads (radial and axial) simultaneously, making it ideal for high-speed spindles requiring maximum rigidity and precision.
S71918 ACD/HCP4ATT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Stainless Steel (Note: Specification indicates Chrome Steel ring material) |
| 7 | Angular Contact Bearing |
| 1918 | Bore Diameter: 90 mm, Outside Diameter: 125 mm, Width: 54 mm |
| ACD | 25° Contact Angle |
| HC | Hybrid Ceramic (Ceramic balls with steel rings) |
| P4A | High Precision Tolerance Class (Equivalent to ABEC 7) |
| T | Phenolic (Resin) Cage |
| T | Grease Lubrication |
S71918 ACD/HCP4ATT Bearing Structural Features & Performance Benefits
- Triplex Tandem Matched Set: Three bearings are pre-matched and supplied as a set in a tandem arrangement. This configuration provides extremely high axial rigidity and is designed to handle substantial thrust loads in one direction.
- Hybrid Ceramic Construction: The use of ceramic balls with steel rings reduces weight, lowers centrifugal forces, and minimizes friction. This directly contributes to higher limiting speeds (15,000 rpm), reduced operating temperature, and longer service life.
- High-Precision P4A Grade: Tighter dimensional and running accuracy tolerances ensure smooth, quiet operation and precise rotational control, which is critical for machine tool spindles.
- Phenolic Cage: The lightweight and robust phenolic resin cage offers excellent performance at high speeds and is suitable for the specified temperature range.
- Superior Load Capacity: With a dynamic load rating of 21,510 lbf and a static load rating of 32,175 lbf, this bearing set is built to withstand significant combined loads.
S71918 ACD/HCP4ATT Bearing Typical Application Areas
This high-performance precision bearing set is ideally suited for applications demanding the highest levels of speed, rigidity, and accuracy.
- High-Speed Machine Tool Spindles: CNC milling, grinding, and jig boring machines.
- Precision Rotary Systems: High-frequency spindles for PCB drilling and routing.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other precision mechanisms.
- High-Performance Pumps & Compressors: Where reliability and speed are paramount.
