S71908 ACD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71908 ACD/HCP4ADBC
Basic Information
System of measurement
Metric
Weight
0.2 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4275 lbf
Radial static load rating
3600 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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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S71908 ACD/HCP4ADBC Bearing Product Overview & Core Advantages
The S71908 ACD/HCP4ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Moderate / Class C specifications, providing outstanding operational stability and resistance to complex combined loads (radial and axial). Its construction with a phenolic cage and ceramic balls enables superior high-speed performance, while the sealed design with grease lubrication ensures long-term, maintenance-free operation in a specified temperature range. This bearing is engineered for high-precision, high-rigidity systems.
S71908 ACD/HCP4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number S71908 ACD/HCP4ADBC provides detailed technical specifications:
- S7: Indicates a series of high-precision, high-speed angular contact ball bearings.
- 1908: Denotes the size series; 19 for the series and 08 for a 40 mm bore diameter.
- ACD: Signifies the bearing is a Duplex Arrangement (Back-to-Back) with a standard contact angle.
- HCP4A: Defines the tolerance class P4A (very high precision) and the use of a phenolic cage.
- DBC: Specifies the Moderate / Class C preload applied to the matched set.
S71908 ACD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement and moderate preload create an exceptionally rigid bearing system, capable of handling significant combined radial and axial loads from both directions simultaneously.
- Superior High-Speed Performance: The lightweight phenolic cage and low-density ceramic balls reduce centrifugal forces, allowing for a high limiting speed of 41,000 rpm. The 25° contact angle is optimized for high-speed axial load support.
- Precision & Longevity: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration for ultra-precise applications. The sealed design and pre-applied grease lubrication protect against contamination and provide a long, maintenance-free service life within the -30°C to 110°C range.
S71908 ACD/HCP4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and rigidity are critical. Key applications include:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
- Advanced Robotics and Automation Systems
